Quizes

Large molecules; such as RNA molecules, are able to move out of the nucleus by a. moving through nuclear pores b. being broken down to their constituents monomers and then reassembled on the other side of the membrane c. diffusing across the nuclear membranes d. inserting themselves between the lipid molecules in the nuclear membranes

A

Nitrogen (N) is more electronegative than hydrogen (H). Which of the following statements is correct about ammonia (NH3)? a. each hydrogen atom has a partial postive charge b. there are covalent bonds between the hydrogen atom c. the nitrogen atom has a strong positive charge d. each hydrogen atom has a slight negative charge

A

One of the reasons that the action of enzymes is highly specific is because a. the shape of the active site is complementary to the shape of the reactant(s). b. they donate free energy to the reactant. c. they lower the activation energy of the reaction. d. they have highly complex structures.

A

The structural level of a protein that is LEAST affected by a disruption in hydrogen bonding is the a. primary level b. quaternary level c. tertiary level d. secondary level

A

When an electron is moved further from the nucleus a. it gains potential energy b. its potential energy is unchanged c. it loses potential energy d. its potential energy may change, depending on how the electron was moved

A

Which of the following structures acts to prevent leakage of extracellular fluid between neighboring animal cells? a. tight junctions b. desmosomes c. extracellular matrix d. gap junctions

A

Consider the three major components of the cytoskeleton. Which of the following is a correct match? a. microfilaments and ciliary motion b. microtubules and chromosome movement c. microfilaments and nuclear lamina d. intermediate filaments and cytoplasmic streaming

B

How can one increase the rate of a chemical reaction? a. Increase the entropy of the reactants. b. Add a catalyst c. Increase the activation energy needed. d. Cool the reactants.

B

In eukaryotic cell walls a. contain cellulose b. all of these answers are correct c. contain pores known as plasmodesmata d. are found in plant but not in animal cells

B

The active site of an enzyme is the region that a. binds the products of the catalytic reaction b. is involved in the catalytic reaction of the enzyme c. is inhibited by the presence of a coenzyme or cofactor d. binds allosteric regulators of the enzyme

B

The cytoskeleton is comprised of a. microtubules b. all of these answers are correct c. microfilaments d. intermediate filaments

B

The cytoskeleton is comprised of a. intermediate filaments b. all of these answers are correct c. microtubules d. microfilaments

B

The number of electrons needed to fill the 1st and 2nd electron shells is a. 4 in the 1st shell and 8 in the 2nd shell b. 2 in the 1st shell and 8 in the 2nd shell c. 2 in the 1st shell and 2 in the 2nd shell d. 2 in the 1st shell and 4 in the 2nd shell

B

The tertiary structure of a protein refers to a. organization of a polypeptide chain into an a helix or b pleated sheet b. the 3-dimensional shape of a polypeptide c. its amino acid sequence d. the overall shape of the protein formed by the association of two or more polypeptides

B

Water has a high specific heat because a. liquid water is denser than frozen water (ice) b. much of the energy absorbed by water goes to breaking hydrogen bonds between water molecules, rather then to raising the temperature of the water c. the bonds between the hydrogen and oxygen atoms in a water molecule are polar covalent bonds d. water is an excellent solvent

B

When oxygen is released as a result of photosynthesis, it is a direct by-product of a. chemiosmosis. b. splitting water molecules. c. reducing NADP+. d. the electron transfer system of photosystem I.

B

When the pH of a solution shifts from 7 to 3, how has the hydrogen ion concentration changed? a. It has increase by 4 times. b. It has increased by 10,000 times c. It has decreased by 10,000 times d. It has decreased by 4 times.

B

Which of the following structures acts to prevent leakage of extracellular fluid between neighboring animal cells? a. gap junctions b. tight junctions c. desmosomes d. extracellular matrix

B

Which subatomic particles are directly involved in chemical reactions between atoms? a. protons b. electrons c. nuclei d. neutrons

B

A cell has the following molecules and structures: enzymes, DNA ribosomes, plasma membrane and mitochondria. It could be a cell from a. any kind of organism b. a plant or a bacteria c. a plant or an animal d. an animal or a bacteria

C

A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane and mitochondria. It could be a cell from a. any kind of organism b. a plant or a bacteria c. a plant or an animal d. an animal or a bacteria

C

Animal cells contain a. chloroplasts b. cell walls c. Lysosomes d. large central vacuoles

C

In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis? a. on the outside of vesicles b. on the ER c. on the inside surface of the vesicle d. on the inside surface of the cell membrane

C

Of the following functions, which is most important for the glycoproteins and glycolipids in animal cell membranes? a. Maintaining membrane fluidity at low temperatures. b. Active transport of molecules against their concentration gradients. c. Helping cells distinguish one type of neighboring cell from another. d. Facilitated diffusion of molecules down their concentrations gradients.

C

Polar molecules are often able to dissolve in water because a. the polar molecules attract each other, allowing water molecules to adsorb to them. b. polar molecules are able to fill their valence shells by transferring electrons from water molecules. c. the partially charged regions of polar molecules are able to form hydrogen bonds with water molecules

C

The monomer of polypeptides contains all of the following except a. nitrogen b. an 'R' group connected to one fo the carbons c. a phosphate group d. a carboxyl group

C

Which of the following are examples of types of secondary structures of proteins? a. peptide bonds and disulfide bridges b. alpha helices and disulfide bridges c. alpha helices and beta pleated sheets d. beta pleated sheets and peptide bonds

C

Which of the following descriptions best fits the class of molecules known as nucleotides? a. a nitrogenous base and a phosphate group b. a nitrogenous base and a pentose sugar c. a nitrogenous base, a phosphate group, and a pentose sugar d. a pentose sugar and a purine or pyrimidine

C

Which of the following is a function of the Golgi Apparatus? a. development of quaternary structures b. protein synthesis c. protein modification d. all of these answers are correct

C

Which of the following is characteristic of the lytic cycle? a. Many bacterial cells containing viral DNA are produced. b. Viral DNA is incorporated into the host genome. c. A large number of phages are released and the host cell is destroyed. d. The viral genome replicates without destroying the host.

C

Which of the following is least polar? a. water b. phosphate c. lipid d. most carbohydrates

C

Which of the following would you expect to dissolve poorly in water? a. A substance with a lot of polar covalent bonds b. Anions c. A substance with a lot of nonpolar covalent bonds d. Cations

C

Which pathway is generally followed by a protein produced for secretion? a. smooth ER, vesicle, golgi, vesicle b. golgi, vesicle, smooth ER, vesicle c. rough ER, vesicle, golgi, vesicle d. golgi, vesicle, rough ER, vesicle

C

Which structure is the site of the synthesis of protein that may be exported from the cell? a. Golgi vesicles b. mitochondrion c. rough endoplasmic reticulum d. smooth endoplasmic reticulum

C

Which structure-function pair is mismatched? a. nucleolus; ribosome assembly b. golgi; modification of proteins c. microtubule; protein synthesis d. lysosome; intracellular digestion

C

molecule becomes more oxidized when it a. gains an electron. b. loses a hydrogen (H+) ion. c. loses an electron. d. gains a hydrogen (H+) ion.

C

A nucleotide is composed of a. sugar, protein, and lipid. b. protein, lipid, and a nitrogenous base. c. phospholipid and protein. d. sugar, phosphate, and a nitrogenous base.

D

A nucleotide is composed of a. sugar, protein, and lipid b. protein, lipid, nitrogenous base c. phospholipid and protein d. sugar, phospate, and a nitrogenous base

D

A student was asked to draw a structure where all of the atoms involved had a complete valence shell. Why is the structure shown below incorrect? H-C=C-H a. Carbon is more electronegative than hydrogen and should thus remove electrons from hydrogen, rather than forming a covalent bond with hydrogen. b. The two carbon atoms share more than 1 bond. c. Each hydrogen atom only has 1 covalent bond. d. Each carbon atom only has 3 covalent bonds.

D

Which of the following modifies polypeptides that will be secreted? a. vacuole b. mitochondrion c. lysosome d. Golgi apparatus

D

When two atoms are equally electronegative, they will interact to form a. ionic bonds b. polar covalent bonds c. nonpolar covalent bonds d. ions

c

What is the maximum number of electrons in the 1s orbital of an atom? a. 2. b. 1. c. 3. d. 4.

A

A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (TMV). The cell contents are left in a covered test tube overnight. The next day this mixture is sprayed on tobacco plants that have been exposed to extremely windy conditions. Which of the following would be expected to occur? a. The plants would develop the typical symptoms of TMV infection. b. The plants would develop some but not all of the symptoms of the TMV infection. c. The plants would develop symptoms typically produced by viroids. d. The plants would not show any disease symptoms.

A

All of the following are part of a prokaryotic call except a. an endoplasmic reticulum b. ribosomes c. DNA d. a plasma membrane

A

Amphipathic molecules a. have both hydrophilic and hydrophobic regions b. have both positively charged and negatively charged regions c. have modified carbohydrates d. are only found in membranes

A

Animal cells contain a. lysosomes b. chloroplasts c. large central vacuoles d. cell walls

A

Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as ________ is to ________. a. exergonic; endergonic b. exergonic; spontaneous c. entropy; enthalpy d. free energy; entropy

A

Gap junctions function to a. provide cytoplasmic channels between neighboring animal cells b. fasten neighboring animal cell together into strong sheets c. prevent leakage of extracellular fluid between neighboring animal cells d. create spaces between neighboring animal cells

A

If you explore a biological concept by breaking down the complex system to its simpler components, you are used an approach called a. reductionism b. simplificationsim c. emergent properties d. morphologism

A

In animal cells, hydrolytic enzymes are packaged in which of the following organelles? a. lysosome b. central vacuole c. chloroplast d. mitochondrion

A

The bonds that are broken when water vaporizes are a. hydrogen bonds b. ionic bonds c. nonpolar covalent bonds d. polar covalent bonds

A

The correct order of the following atoms, from most to least electronegative is a. oxygen, nitrogen, carbon, hydrogen b. nitrogen, carbon, oxygen, hydrogen c. oxygen, carbon, nitrogen, hydrogen d. hydrogen, carbon, nitrogen, oxygen

A

What is the difference between covalent bonds and ionic bonds? a. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms. b. Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. c. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between atoms. d. Covalent bonds involve the transfer of electrons between atoms; ionic bonds involve the sharing of electrons between atoms.

A

The following functional group is known as -SH a. a sulfhydryl group b. a sulfate group c. all of these answers are correct d. a hydrogen sulfide group

A

When a sodium atom and a chlorine atom interact to complete their valence shells a. an electron is transferred from sodium to chlorine, turning the sodium atom into a cation and the chlorine atom into an anion and allowing the two atoms to form an ionic bond b. they form 2 polar covalent bonds c. they form 1 polar covalent bond d. an electron is transferred from sodium to chlorine, turning the sodium atom into an anion and the chlorine atom into an cation and allowing the two atoms to form an ionic bond

A

When two atoms share a pair of electrons, they a. form an ionic bond b. form a covalent bond c. form a paired bond d. form an electrical bond

A

Which of the following modifies polypeptides that will be secreted? a. golgi apparatus b. lysosome c. vacuole d. mitochondrion

A

Which of the following statements about the Golgi Apparatus is TRUE? a. Vesicles from the endoplasmic reticulum travel to the near, or cis, side of the golgi apparatus. b. Vesicles from the endoplasmic reticulum travel to the far, or trans, side of the golgi apparatus. c. Vesicles from the endoplasmic reticulum travel to the near, or cystic, side of the golgi apparatus. d. Vesicles from the endoplasmic reticulum travel to the far, or transmembrane, side of the golgi apparatus.

A

Which of the following statements about vacuoles is TRUE? a. Some animal cells and all plant cells have vacuoles, but only plant cells have large central vacuoles. b. Only plant cells have vacuoles. c. Only animal cells have vacuoles. d. Both animal and plant cells have large central vacuoles.

A

Which of the following statements about vacuoles is TRUE? a. some animal cells and all plant cells have vacuoles, but only plant cells have large central vacuoles b. only plant cells have vacuoles c. only animal cells have vacuoles d. both animal and plant cells have large central vacuoles

A

If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, this means that a. the concentration of H+ ions is tenfold higher in the mitochondrial matrix than in the cytoplasm b. the concentration of H+ ions is tenfold higher in the cytoplasm than in the mitochondrial matrix c. the mitochondrial matrix is more acidic than the cytoplasm d. the concentration of H+ ions in the cytoplasm is 7/8 the concentration in the mitochondrial matrix

B

One function of both alcohol fermentation and lactic acid fermentation is to a. reduce NAD+ to NADH. b. oxidize NADH to NAD+. c. reduce FADH2 to FAD+. d. reduce FAD+ to FADH2.

B

Organelles other than the nucleus that contain DNA include a. mitochondria and lysosomes b. mitochondria and chloroplasts c. lysosomes and peroxisomes d. mitochondria and peroxisomes

B

Organelles other then the nucleus that contain DNA include a. mitochondria and lysosomes b. mitochondria and chloroplasts c. mitochondria and peroxisomes d. lysosomes and peroxisomes

B

Scientists choose among competing hypotheses by a. keeping the hypothesis that is the most logical and discarding the rest b. discarding those hypotheses that make false predictions c. proving which hypothesis is true d. selecting two or three of the most popular hypotheses, and voting on which is appropriate for the times

B

Where in the cell would you expect glycoproteins (carbohydrates added to proteins) are modified? a. Carbohydrates are added to proteins in the rough endoplasmic reticulum and then modified in the smooth endoplasmic reticulum b. Carbohydrates are added to proteins in the rough endoplasmic reticulum and then modified in the golgi apparatus c. Carbohydrates are added to proteins in the smooth endoplasmic reticulum and then modified in the rough endoplasmic reticulum d. Carbohydrates are added to proteins in the smooth endoplasmic reticulum and then modified in the golgi apparatus

B

Which of the following effects is produced by the high surface tension of water? a. Evaporation of sweat from the skin helps to keep people from overheating. b. A water strider can walk across the surface of a small pond. c. Lakes don't freeze solid in winter, despite low temperatures. d. Organisms resist temperature changes, although they give off heat due to chemical reactions.

B

Which of the following effects is produced by the high surface tension of water? a. evaportaion of sweat from the skin helps to keep people from overheating b. a water strider can walk across the surface of a small pond c. lakes don't freeze solid in winter, despite low temperatures d. organisms resist temperature changes, although they give off heat due to chemical reactions

B

Which of the following is a compartment that often takes up much of the volume of a plant cell? a. lysosome b. central vacuole c. nucleus d. gogli apparatus

B

Which of the following is common to both bacteria and viruses? a. metabolic pathways b. nucleic acids as the genetic material c. ribosomes for protein synthesis d. cell division

B

Consider an element made up of atoms that each contain four electron shells. Which of the following statements is most broadly true of the atoms of that element? a. the chemical behavior of atoms is mostly dependent on the electrons in their first electron shell b. the chemical behavior of atoms is mostly dependent on the electrons in their third electron shell c. the chemical behavior of atoms is mostly dependent on their valance electrons d. the chemical behavior of atoms is mostly dependent on the electrons in their second electron shell

C

In the following fermentation reaction, which molecule is oxidized? Pyruvate + NADH + H+ ----> Lactate + NAD+ a. NAD+ b. pyruvate c. NADH d. lactate

C

Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules? a. Starches b. Lipids c. Proteins d. Glucose

C

Lipids that contain one or more C=C double bonds are referred to as a. saturated fats b. triacylglycerols c. unsaturated fats d. phospholipids

C

Many lipids are formed by the bonding of a. nucleotides and amino acids b. glycerol and amino acids c. glycerol and fatty acids d. amino acids and fatty acids

C

Some substances such as oil and gasoline will not dissolve in water because a. oil and gasoline are organic compounds. b. their electrons are so stable that they do not exchange atoms with water molecules. c. their molecules have no charges or partial charges to which water molecules can interact. d. their molecules are so large.

C

The mathematical expression for the change in the free energy of a system is ∆G = ∆H - T∆S. Which of the following is (are) TRUE? a. T is the temperature in degrees Celsius. b. ∆G is the change in enthalpy. c. ∆S is the change in entropy. d. ∆H is the change in free energy.

C

The oxygen released by photosynthesis comes from the a. reduction of carbohydrate. b. oxidation of carbohydrate. c. splitting of water. d. splitting of carbon dioxide.

C

The quaternary structure of a protein refers to a. the 3-dimensional shape of a polypeptide b. organization of a polypeptide chain into an α helix or β pleated sheet. c. the overall shape of the protein formed by the association of two or more polypeptides d. its amino acid sequence

C

What is a triacylglycerol? a. A lipid that makes up much of the plasma membrane b. A protein with a tertiary structure c. A lipid made with three fatty acids and glycerol d. A molecule formed from three alcohols by dehydration reactions.

C

What is the change in free energy of a system at chemical equilibrium? a. slightly increasing b. greatly increasing c. no net change d. slightly decreasing

C

When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated? a. It is used to store energy as more ATP. b. It is used to power yet more cellular work. c. It is lost to the environment. d. It is used to generate ADP from nucleotide precursors.

C

When two atoms are equally electronegative, they will interact to form a. ions b. ionic bonds c. nonpolar covalent bonds d. polar covalent bonds

C

Which chemical group is most likely to be responsible for an organic molecule behaving as a base? a. carbonyl b. hydroxyl c. amino d. carboxyl

C

Which of the following effects is produced by the high surface tension of water? a. Organisms resist temperature changes, although they give off heat due to chemical reactions. b. Evaporation of sweat from the skin helps to keep people from overheating. c. A water strider can walk across the surface of a small pond. d. Lakes don't freeze solid in winter, despite low temperatures.

C

Which of the following is characteristic of the lytic cycle? a. many bacterial cells containing viral DNA are produced b. viral DNA is incorporated into the host genome c. a large number of phages are released and the host cell is destroyed d. the viral genome replicates without destroying the host

C

Which of the following relationships between cell structures and their respective functions is CORRECT? a. chloroplasts; chief sites of cellular respiration b. chromosomes; cytoskeleton of the nucleus c. cell wall; support, pretection d. ribosomes; secretion

C

Which of the following statements about diffusion is TRUE? a. It is a passive process in which molecules move from a region of lower concentration to a region of higher concentration. b. It requires an expenditure of energy by the cell c. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration d. It is an active process in which molecules move from a region of lower concentration to a region of higher concentration

C

Which of the following statements describes the lysogenic cycle of lambda (λ) phage? a. Certain environmental triggers can cause the phage to exit the host genome, switching it from the lytic to the lysogenic cycle. b. Once the phage enters the lytic cycle the host cell is protected from death. c. The phage genome replicates along with the host genome. d. After infection, the viral genes must immediately integrate into the host DNA. After one generation in the lysogenic cycle, the phage must enter the lytic cycle.

C

Which of the following statements regarding atomic particles is correct? a. electrons are negatively charged, protons are positively charged and neutrons are positively charged b. electrons are negatively charged, protons are neutral and neutrons are neutral c. electrons are negatively charged, protons are positively charged and neutrons are neutral d. electrons are negatively charged, protons are positively charged and neutrons are negatively charged

C

Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? a. glucose b. an amino acid c. CO2 d. K+

C

Citric acid makes lemons taste sour. Which of the following is a functional group that would cause a molecule like citric acid to be acidic a. carbonyl b. hydroxyl c. hydrocarbon d. carboxyl

D

Compounds with sulfhydryl groups are known as a. hydrogen sulfurs b. sulphates c. hydrogenated sulfurs d. thiols

D

An example of a hydrogen bond is the bond between a. C and H in methane (CH4) b. Mg+ and Cl- in MgCl2 c. the two hydrogen atoms in a molecule of hydrogen gas (H2) d. the H of one water molecule and the O of another water molecule

D

If someone wants to eat lots of carbohydrates in preparation for running a marathon, that person could a. eat lots of sugars b. eat lots of monosaccharides c. eat lots of polysaccharides d. all of these answers are correct

D

If you explore biological concepts and you observe novel (new) properties at each level of organization that were absent from the preceding level of organization, these properties are called a. complex b. metamorphic c. reductionist d. emergent

D

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by a. hydrogen bonds b. nonpolar covalent bonds c. van der Waals interactions d. polar covalent bonds

D

In contrast to non-competitive inhibitors, competitive inhibitors of enzyme activity a. can NOT have their effects reversed by addition of more substrate. b. act allosterically. c. cause enzymes to denature. d. always utilize an enzyme's active site

D

In photosynthesis, reactions that require CO2 take place in a. the light reactions alone. b. neither the light reactions nor the Calvin cycle. c. both the light reactions and the Calvin cycle. d. the Calvin cycle alone.

D

Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules? a. Glucose b. Starches c. Lipids d. Proteins

D

The Theory of Evolution can explain a. the unity of life. b. the diversity of life. c. the complex nature of life. d. both "a" and "b".

D

What gives rise to the cohesiveness of water molecules? a. Ionic bonds b. Nonpolar covalent bonds c. Hydrophobic interactions d. Hydrogen bonds

D

What gives rise to the cohesiveness of water molecules? a. ionic bonds b. nonpolar covalent bonds c. hydrophobic interactions d. hydrogen bonds

D

What maintains the secondary structure of a protein? a. disulfide bonds b. peptide bonds c. ionic bonds d. hydrogen bonds

D

When glucose monomers are joined together by glycosidic linkages to form a cellulose polymer, the changes in free energy, enthalpy and entropy are as follows: a. +∆H, -∆S, -∆G b. -∆H, -∆S, +∆G c. +∆H, +∆S, +∆G d. +∆H, -∆S, +∆G

D

When the pH of a solution shifts from 7 to 3, how has the hydrogen ion concentration changed? a. it has decreased 10,000 times b. it has increased by 4 times c. it has decreased by 4 times d. it has increased by 10,000 times

D

Which of the following are commonly made at the smooth endoplasmic reticulum (ER)? a. membrane proteins d. secreted proteins c. all of these answers are correct d. lipids

D

Which of the following are structural polysaccharides? a. glycogen and cellulose b. starch and chitin c. glycogen and starch d. cellulose and chitin

D

Which of the following in NOT found in RNA molecules? a. uracil b. guanine c. cytosine d. thymine

D

Which of the following most accurately describes the structure of a membrane formed by phospholipids? a. The phospholipids are arranged in a bilayer, with their hydrocarbon tails on the outside of the bilayer and their phosphate groups pointing toward the interior of the membrane. b. The phospholipids are arranged in a monolayer, with their hydrocarbon tails pointing toward the interior of the cell and their phosphate groups on the outside of the cell. c. The phospholipids are arranged in a monolayer, with their hydrocarbon tails on the outside of the cell and their phosphate groups pointing toward the interior of the cell. d. The phospholipids are arranged in a bilayer, with their hydrocarbon tails pointing toward the interior of the membrane and their phosphate groups on the outside of the bilayer.

D

Which of the following represents a polar bond? a. O=O b. C-C c. C-H d. C-O

D

Which of the following would be the most likely mechanism used by a protein exiting a cell? a. passive diffusion b. endocytosis c. phagocytosis d. exocytosis

D

Which of the following would not be found in a prokaryotic cell? a. DNA b. enzymes c. plasma membrane d. lysosomes

D

Which part(s) of the cellular catabolism of glucose requires molecular oxygen (O2) and produces CO2? a. the citric acid cycle (Krebs cycle) b. glycolysis c. the combination of glycolysis and the citric acid cycle (Krebs cycle) d. the combination of the citric acid cycle (Krebs cycle) and the electron transport chain

D

Which particles are found in the nuclei of atoms? a. neutrons, protons and electrons b. neutrons and electrons c. protons and electrons d. neutrons and protons

D

Which statement correctly characterizes bound ribosomes? a. bound and free ribosomes are structurally different b. bound ribosomes are enclosed in their own membrane c. all these answers are correct d. bound ribosomes generally synthesize membrane proteins and secretary proteins

D