Biology midterm
In figure 3-2, ionic bonds would form between the R groups of which amino acids?
2 and 4
You isolate a cellular structure and determine that it is composed of a-tubulin and b-tubulin. Based on this evidence, you correctly identify this structure as:
A microtubule
All of the members of the same species occupying the same area at the same time constitute:
A population
The type of bond illustrated in figure 2-2 is:
A single covalent bond
The difference between an electrically neutral atom and an ion is that:
An ion has an unequal number of protons and electrons, while an atom has an equal number.
When tissue organize into functional structures they form:
An organ
Which of the following is NOT an adaptation of Burchell's zebras to their environment?
Asexual reproduction
The domain Eukarya includes all of the following EXCEPT:
Bacteria
As you move one step higher in the hierarchical classification system, similar families of organisms are next grouped together in the same:
Order
Which component is the oxidizing agent in the following chemical reaction? 4 Fe + 3 O2 > 2Fe2O3
Oxygen
In a water molecule, because oxygen is more electronegative than hydrogen, the shared electrons are more commonly found around the ____ nucleus more often than the ____ nucleus
Oxygen; hydrogen
All of the following types of chemical bonds are responsible for maintaining the tertiary structure of the polypeptide except:
Peptide bonds
You discover an organism that is eukaryotic, unicellular, and photosynthetic. Based on this evidence you correctly assign this organism to the:
Protist group
The molecular fragment represented in figure 3-3 is:
RNA
Membrane-bounded organelles facilitate faster chemical reactions because:
Reactants are within close proximity to each other
Sequence B in figure 1-1 represents:
The control groups
A molecule of a saturated triacylglycerol contains:
The maximum number of hydrogen atoms in the fatty acid chains
Which of the following is NOT a major theme of biology?
The mechanisms of disease
Information in living organisms can be transmitted by:
Genes, hormones, and neurotransmitters
A carbohydrate energy storage molecule found in animal liver and muscle cells is:
Glycogen
Proteins made on ribosomes may be further modified within the:
Golgi complex
If a particular protein were being produced in excess of the cell's needs, then ____ mechanisms intervene to stop production.
Homeostatic
Which of the following is responsible for the alpha-helical structure of proteins?
Hydrogen bonds
Which characteristic of water makes the existence of pH possible?
Ionization
Which component becomes oxidized in the following chemical reaction? 4 Fe + 3 O2 > 2 Fe2O3
Iron
Analysis of a certain polymer shows that it contains phosphate group, ribose sugars, and pyrimidines. Based on this information, which of the following is the best description of this compound?
It is more likely ribonucleic acid
Homeostasis in living organisms involves processes that:
Maintain a constant internal environment
A covalent bond:
May be polar or nonpolar depending on the atoms involved
Using the Linnaean system of nomenclature, corn is named Zea mays. In this name, the specific epithet is:
Mays
In living organisms, chemical reactions responsible for growth, repair, and nutrition are collectively referred to as:
Metabolism
Which of the following illustrates hydrolysis?
the reaction of a fat to form glycerol and fatty acids
glucose dissolves in water because:
it has polar hydroxyl groups that interact with polar water molecules
A pH of 4 is ____ times more ___ than a pH of 7.
1000; acidic
The atomic mass of the atom identified as A in figure 2-1 is:
12
How many molecules are present in one mole of C6H12O6?
6.02' 10^23 molecules
It is advantageous for cells to be small because:
A small cell has a small volume relative to surface area, thereby increasing efficient transport.
The representation H-O-H is known as:
A structural formula
The cis face of the Golgi complex is most directly involved in which of the following?
Accepting vesicles from the ER
A stalk of celery is placed in a solution of blue colored dye. After one hour, the leaves have blue fluid in their veins. Which property of water is being demonstrated?
Adhesion and cohesion
The cell theory states that all living organisms:
Are composed of basic units called cells
Which of the following is the most basic level of chemical organization?
Atom
Evidence that all living cells have a common origin is provided by:
Basic similarities in cell structure and chemistry
Biological growth involves an increase in:
Both the number and size of cells
An element is defined as a substance that:
Cannot be broken into simpler substances by chemical reactions
Which of these terms is most inclusive?
Carbohydrate
Which of the following is NOT a concept or term related to evolution?
Cellular respiration
All of the following are associated with the process of evolution but which of these statement best defines the overall processes of evolution?
Changing of populations over time
A cellular structure found in plant but not animal cells is the:
Chloroplast
Which of the following structures would not be found in cells of a plant's roots?
Chloroplasts
Which of the following molecules is not grouped with the lipids?
Glycoproteins
A eukaryotic cell:
Has a variety of membranous organelles
If you partially hydrogenate oleic acid, the resulting molecule most likely would:
Have a double bond changed from cis to trans
One strategy that allows larger cells to have an effective surface area to volume ration is:
Having thin, finger-like projections
The process whereby water molecules surround ions during the process of dissolving is called:
Hydration
The covalent bond between a hydrogen atom and the oxygen atom in water if formed when:
Hydrogen and oxygen share an electron pair
The cohesiveness between water molecules is due largely to:
Hydrogen bonds
Which characteristic of water molecules directly contributes to the remarkable "water walking" success of the aquatic insects pictured in the accompanying figure?
Hydrogen bonds
The process illustrated in figure 3-1 is called:
Hydrolysis
A good hypothesis:
Is falsifiable
ATP is important in living organisms because:
It can transfer some of its energy to other chemicals and thus serves as the primary energy currency of all cells.
An atom becomes a cation if:
It loses one or more electron.
Radioisotopes are used in all of the following scientific applications except:
Measuring the pH of the blood
When a nucleic acid undergoes hydrolysis, the resulting subunits are:
Nucleotides
Chlorine has seven electrons in its valence shell. The number of electrons it must gain to complete its valence shell is:
One
Which of the following terms includes the fewest species of organisms?
Population
Which of the following structures or activities is NOT directly part of the endomembrane system?
Ribosomes
Which of the following elements is NOT responsible for a significant portion of the mass of living organism?
S
The accompanying figure is the product of a:
Scanning electron microscope
All of the following functions are performed by plant vacuoles EXCEPT:
Storage of nucleic acids
The smooth endoplasmic reticulum:
Synthesizes lipids
Which of the following statements is FALSE?
The 2nd energy level contains a maximum of 10 electrons
The chemical interactions of large organic molecules are largely determined by:
Their functional groups
Which of the following is NOT true of hormones?
They are a type of gene
Which of the following statements concerning steroids is FALSE?
They are always detrimental to living organisms
Which of the following statements concerning unsaturated fats is correct?
They are generally liquid at room temperature
Which of the following statements concerning van der Waals interactions is FALSE:
They are very strong
Which of the following is NOT true of proteins?
They contain the code of the "recipe" for making other molecules that are important for life processes
Which of the following statements concerning centrioles is FALSE?
They have 9+2 arrangement of microtubules
Similar orders are placed in the same class.
True
Monosaccharides are water soluble because:
they have a large number of polar hydroxyl groups
The force necessary to cause microtubules of cilia and flagella to slide alongside one another is provided through the action of __________ proteins, which derive the energy to perform their work directly from __________ molecules.
Dynein; ATP
Proteins with alpha-helical forms exhibit this property:
Elasticity
In which of the following reactions must be the equivalent of a water molecule be added in order to break a bond?
Glycogen > glucose
The __________ can be considered a sorting, processing and packaging center.
Golgi complex
Which of the following is a key component of the cytoskeleton?
Microtubules
Which of the following is(are) composed of a gluelike polysaccharide called pectin and is located between the primary walls of adjacent plant cells?
Middle lamella
Which of the following organelles plays an important role in apoptosis, or programmed cell death?
Mitochondria
Which of the following functions would most likely be occurring in the lumen of the rough endoplasmic reticulum in Figure 4-2?
Molecular chaperone activity
Figure 2-2 represents:
Molecular hydrogen
Which pair is mismatched?
Monosaccharide-maltose
Cilia and flagella are most directly involved in:
Movement
Which of the following is NOT a characteristic of all living organisms
Multicellularity
The ultimate source of genetic variation within a population is:
Mutations in DNA
Isotopes differ from each other with respect to the number of:
Neutrons only
Covalently bonded atoms with similar electronegativities are:
Nonpolar
The flowing amino acid would be characterized as _____ based on the chemical properties of its side chain.
Nonpolar
The largest and most complex assembly of proteins in the eukaryotic cell, consisting of 30 different proteins, is the __________.
Nuclear pore
This molecule transmits heredity information:
Nucleic acid
Which pair matches the correct macromolecule with the bond that joins its subunits?
Nucleic acid-phosphodiester linkage
A single cell in a smoker's lung has become cancerous. It doubles its DNA and divides much faster than a normal lung cell. The most likely change that would have caused this condition took place in the:
Nucleus
The chemical behavior of an atom is determined by the:
Number of valence electrons
Electron microscopes have a much higher resolution than either the human eye or any light microscope because:
Of the very shot (nanometer) wavelengths of electrons
One of the conclusions drawn from Darwin's theory of evolution is that:
Organisms living today descended with modifications from previously existing forms.
Molecular chaperones are proteins that mediate the folding process of:
Other proteins
The most abundant molecules in this structure are:
Phospholipids
The organelle featured in Figure 4-3:
Plays a central role in energy metabolism
In Darwin's theory of evolution, adaptation involves changes in:
Population
If an organism is eukaryotic, then by definition it will:
Possess a nucleus
In the deductive approach to scientific thought processes, we begin with ____ and make ____ based on that information
Premises; conclusions
If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?
Protein synthesis
Refer to Figure 4-2. The rough endoplasmic reticulum indicated by the arrow is responsible for
Protein synthesis
DNA most directly determines which _____ are made by a cell
Proteins
Which of the following statements is true of proteins?
Proteins lose some or all of their normal activity if their three-dimensional structure is disrupted
The primary difference between the amino acids commonly found in proteins is in their:
R or variable groups
Nucleoli contain chromosomal regions that specialize in making:
RNA
The formation of carbohydrates from carbon dioxide and water occurs in the portion of the chloroplast called the:
Stroma
Reductionism refers to the method of investigating structures by:
Studying the parts of the structures
Autotrophs:
Synthesize complex molecules from CO2, water, and energy
Based on you knowledge of basic geometric relationships, the actual surface area to volume ratio for figure B in Figure 4-2 is:
0.06
What is the OH- concentration of a solution having a pH of 2?
1'10^-12
Identify the hydrogen ion concentration that represents the lowest pH from the following list:
1'10^-3
At what temperature is water most dense?
4 degrees Celsius
The molecular mass of C6H12O6 is 180 amu. 0.25 moles of this substance contain:
45 g.
The organism in the accompanying figure can be classified as:
A bird
Which one of the following is a characteristic of asexual, as opposed to sexual, reproduction?
A cell splitting in half
The type of connection between the atoms at the point labeled 1 in figure 3-3 is:
A phosphodiester linkage
A hypothesis is:
A tentative explanation
As a result of testing an experimental drip on a vertebrate cell, you notice that the cell cortex becomes more fluid, and although the cell remains strong, it loses its ability to move. Based on this evidence, you correctly conclude that the drug most directly affected:
Actin filaments
When a small amount of hydrochloric acid (HCl) is added to a solution of Na2HPO4, the pH of the solution does not change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to the same solution. Based on these observations, the compound Na2HPO4 is:
Acting as a buffer
This functional group is weakly basic because it can accept an H+ ion:
Amino
A salt is a compound in which the hydrogen ion of ____ is replaced by some other cation
An acid
This characteristic of a molecule determines the ability of hydrogen bonds to form between it and hydrogen:
An atom with a partial negative charge
Which scientist first viewed living cells?
Anton van Leeuwenhoek
Carbohydrate molecules:
Are a source of energy
Which of the following is produced via the process of cellular respiration?
Carbon dioxide
If glycine and alanine undergo condensation, the new bond that is formed is between the:
Carbon of the carboxyl group and the nitrogen of the amino group
Which of the following is not a property of carbon?
Carbon-to-carbon bonds are limited to single bonds
You isolate a compound that is insoluble in water, has alternating single and double bonds, and has a bright orange color. You correctly conclude that this compound is a:
Carotenoid
Which one of the following carbohydrates is the most structurally complex?
Cellulose
Which of the following pairs is correctly matched?
Centrosome-cell division
The theory that chloroplasts and mitochondria had their evolutionary beginnings in eukaryotic cells as endosymbionts is supported by all of the following EXCEPT:
Chloroplasts and mitochondria do NOT interact with or depend on any of the other cellular components
DNA is associated with proteins, forming a complex called:
Chromatin
A glycoprotein destined for secretion from the cell would move through the Golgi complex in this sequence:
Cis face to medial region to trans face
A chemical reaction in which monomers become covalently linked and thus synthesizes polymers from their building blocks is called:
Condensation
The main process that occurs at the site of the structures marked by arrows in Figure 4-3 is:
Conversion of food molecules to ATP
The structures indicated by the arrows in Figure 4-3 are:
Cristae
Which of the following is NOT a cell covering or part of a cell covering?
Cristae
In all organisms, hereditary information is encoded within ____ molecules
DNA
One function of peroxisomes involves the process of:
Detoxification
Organisms that are sessile as adults:
Do not move from place to place
Which of the following statements best summarizes the differences between RNA and DNA?
DNA comprises the genes, while RNA is a direct participant in the process of protein synthesis
The hydrolysis of triacylglycerol will yield:
Three fatty acids and one glycerol
An individual flattened membrane within the chloroplast is called the:
Thylakoid
An amphipathic molecule has:
A hydrophobic and a hydrophilic portion
The science of life is:
biology
A solution having a pH of 6 would
Be slightly acidic
Identify the chemical(s) that act(s) as a buffer in human blood:
Bicarbonate
The structures in the micrograph are:
Both cilia and flagella
When you use deductive reasoning, you draw conclusions from specific observations.
False
Evaporative cooling is a process whereby ____ moving ____ molecules vaporize, thus ____ large amounts of heat
Fast; water; removing
If we want to examine the effect of a fertilizer on the size of zucchini produced, we would need to establish both experimental and control groups, the experimental group has all the following: soil, fertilizer, water, sun, and zucchini seeds. The control group for this experiment would have all of the same components excepts:
Fertilizer
Which of the following statements about figure 4-1 is true?
Figure B has a smaller surface area to volume ratio than figure A
The number of electrons pairs shared between carbon 2 and 3 in the accompanying figure is:
Two
You want to determine the location of a specific protein in a cell using a colored stain. Which of the following is the best technique for this purpose
Fluorescence microscopy
An atom has six protons and eight neutrons. Its atomic mass is _____ atomic mass units.
Fourteen
Which of the following represents the pattern of energy flow within an ecosystem?
From producers to consumers to decomposers
To what group do I belong? I am neither prokaryotic nor photosynthetic, and I obtain nutrients by secreting digestive enzymes into my environment.
Fungi
In a chemical reaction, the product is:
Generally written on the right side and is the substance generated by the reaction
The two molecules in the following figure represents:
Geometric isomers
The scanning electron microscopes differs from the transmission electron microscope in that the scanning electron microscope:
Gives a three-dimensional image of the object being studied
The highly polarized nature of compounds containing carboxyl groups can be attributed to the presence of two:
Highly electronegative oxygen atoms
Which of the following pairs is correctly matched?
Integrins-receptors
Any chemical interaction between atoms:
Involves only valence electrons
The ratio of the size of the image seen with the microscope to the actual size of the object is called:
Magnification
Which of the following has a pH closest to that of human blood?
Sea water
Differential centrifugation is a process that:
Separates components of the cell that have different densities
Which of the following is NOT a concept or term related to the flow of energy through living systems?
Sexual reproduction
Which covalent bond involves only 2 electrons:
Single
Which of the following descriptions or structures does NOT match the cell type?
Smallest cell are egg cells
In the formation of common table salt, sodium and chlorine interact because:
Sodium donates one electron to chlorine
It takes 1 calorie of heat to raise the temperature of 1 gram of water 1 degree Celsius at sea level. This is referred to as the ____ of water
Specific heat
Amyloplasts are organelles that store:
Starch
Which of the following is NOT a term related to information transfer in living systems?
Taxon
Hydrocarbons are hydrophobic because:
The covalent bonds between hydrogen and carbon are nonpolar
Sequence A in figure 1-1 represents:
The experimental group
When a chemical reaction is at dynamic equilibrium
The forward and reverse reactions are proceeding at equal rates
One benefit of sexual reproduction over asexual reproduction is that:
The interaction of the genes from both parents brings about genetic variation
The difference between the two atoms in figure 2-1 is:
The number of neutrons
Table salt dissolves easily in water because:
The partial positive charge of the hydrogens in the water molecule can associate with the negative charge of the chloride ion, and the partial negative charge of the oxygen of the water molecule can associate with the positive charge of the sodium atom.
Figure 2-1 represents:
Two isotopes of the same element
The difference between a stable isotope and a radioisotope is that:
The radioisotope emits radiation
The term sampling error refers to inaccuracies in an experiment due to:
The test being conducted on a very small population of test subjects
Amino acids are important biological buffers because:
Their amino and carboxyl groups can accept and release protons (H+)
Which of the following is NOT true of lipids?
They have many oxygen-containing functional groups
Some white blood cells can engulf bacteria. The engulfed bacteria are encased in a vesicle formed from the plasma membrane. This vesicle fuses with a primary lysosome. The new combined vesicle is now called a secondary lysosome. The reason for forming a secondary lysosome is:
To mix the pathogens with strong hydrolytic enzymes and destroy them
Which of the following stimuli most directly causes the Venus flytrap to catch an insect?
Touch
Which of the following statements is not correct?
Water heats up and cools down very quickly
the difference between a hexose and a pentose is that:
a hexose always has six carbons, but a pentose always has five carbons
A prokaryotic cell differs from a eukaryotic cell in that a prokaryotic cell:
exemplified by bacteria
If the differently shaded portions of this molecule represent different polypeptide chains, then this figure is representative of:
the quaternary structure of a protein