Bio 110- Purdue Fall '19
Animal cells are growing in an incubator at 37 degrees celsius. The cells are then placed into an incubator at 47 degrees celsius. Which of the following is most likely to happen? a. initially, the plasma membrane of the cells become more fluid b. initially, the plasma membrane of the cells become less fluid c. the fluidity of the membrane will not be affected d. more information is needed
a
When animal cells are in an incubator in response to being heated, how will they likely respond? a. by generating membrane phospholipids with fatty acid chains that have fewer C=C double bonds (unsaturations) b. by generating membrane phospholipids with fatty acid chains that have more C=C double bonds (unsaturations) c. neither A or B will work d. more information is needed
a
At a pH of 6, the concentration of protons in solution is a. 10 times lower than it is at a pH of 7 b. 10 times higher than it is at a pH of 7 c. 100 times lower than it is at a pH of 7 d. 100 times higher than it is at a pH of 7 e. none of the above are correct
b
Breaking macromolecules back down into their individual monomers requires a. condensation reactions b. hydrolysis reactions c. hydrolysis and condensation reactions d. more information is needed
b
What form would a collection of these molecules likely takes at room temperature? a. a solid b. a liquid c. a gas d. more information is needed
b
What is another way that the animal cells will respond while in the incubator? a. by generating membrane phospholipids with shorter fatty acid chains b. by generating membrane phospholipids with longer fatty acid chains c. neither A or B will occur d. more information needed
b
What would the net electrical charge of an atom with 4 protons, 5 neutrons, and 5 electrons be? a. 0 b. -1 c. +1 d. +4 e. -4
b
Which option below represents a macromolecule bonded together by a-linkages? a. glucose b. glycogen c. cellulose d. triglycerides e. proteins
b
Which option(s) below represent an energy storage polymer made only by animals? a. cellulose b. glycogen c. starch d. A and B are energy storage polymers made by animals e. B and C are energy storage polymers made by animals
b
All cells fall into one of two broad categories. What are they? a. eubacteria and fungi b. eubacteria and archaea c. prokaryotes and eukaryotes d. archaea and eukaryotes
c
Are plant cell walls chemically similar to prokaryotic cell walls? How are the same or different? a. Yes, plant and bacterial cell walls are both composed of peptidoglycans b. No, plant cell walls are made of peptidoglycans and bacterial cell walls are made of cellulose c. No, plant cell walls are made of cellulose and bacterial cell walls are made of peptidoglycans d. Yes, plant and bacterial cell walls are both composed of cellulose
c
Consider the following electronegativity values: Boron(Br)= 1.8 Carbon(C)= 2.5 Chlorine(CL)= 3.2 Selenium(Se)= 2.6 Which of the following covalent bonds is the most polar? a. C-Se2 b. C-CL c. B-CL d. Se-CL e. more information needed
c
Histones are proteins that bind to chromosomal DNA in the nucleus. Based on that knowledge, which of the following is true? a. Histone proteins will be synthesized by ribosomes associated with the rough ER b. Histone proteins will be synthesized by ribosomes within the nucleus c. Histone proteins will be synthesized by ribosomes in the cytoplasm d. Histone proteins will be synthesized by ribosomes within the mitochondria e. more information needed
c
How are cows able to digest cellulose for energy? a. cows make the necessary enzymes to digest cellulose b. cows have multiple stomachs that can mechanically digest cellulose c. cows contain microorganisms in their digestive system that make the enzymes necessary to digest cellulose d. A and B are both true and together allow cows to digest cellulose e. none of the above
c
If the covalent bonds in a water molecule were nonpolar, what form would water likely take at room temperature? a. a solid b. it would remain a liquid c. a gas d. more information is needed
c
The photo-bleaching experiments we discussed in class demonstrated a. that plasma membranes are phospholipid bilayers b. that the nuclear envelope is a double lipid bilayer c. the fluid mosaic model of plasma membranes d. that cell membranes are made of phospholipids e. none of the above
c
What is most likely true of phospholipids that will become part of a cell's plasma membrane? a. they are synthesized in the smooth ER and sent to the plasma membrane by endocytosis b. they are synthesized in the rough ER and sent to the plasma membrane by endocytosis c. they are synthesized in the smooth ER and sent to the plasma membrane by exocytosis d. they are synthesized in the rough ER and sent to the plasma membrane by exocytosis e. more information is needed
c
What is the definition of a Brönsted-Lowry acid? a. a molecule that donates an electron into a solution b. a molecule that accepts an electron out of solution c. a molecule that donates a proton into a solution d. a molecule that accepts a proton out of a solution e. none of the above are correct
c
Which option below shows the correct order from smallest to largest in size (left to right)? a. atoms, viruses, macromolecules, prokaryotic cells, eukaryotic cells b. atoms, macromolecules, viruses, eukaryotic cells, prokaryotic cells c. atoms, macromolecules, viruses, prokaryotic cells, eukaryotic cells d. macromolecules, atoms, viruses, prokaryotic cells, eukaryotic cells e. atoms, macromolecules, prokaryotic cells, viruses, eukaryotic cells
c
Within the chloroplast there is a thick liquid substance called a. the cytoplasm b. the nucleoplasm c. the stroma d. the matrix e. the lumen
c
Cellulose and starch are both polymers of glucose. How are they different? a. starch is mainly a structural polysaccharide and a polymer of a-glucose, while cellulose is an energy storage molecule and a polymer of b-glucose. b. starch is mainly structural polysaccharide and a polymer of b-glucose, while cellulose is an energy storage molecule and a polymer of a-glucose. c. starch is an energy storage molecule and polymer of b-glucose, while cellulose is mainly a structural polysaccharide and a polymer of a-glucose d. starch is an energy storage molecule and a polymer of a-glucose, while cellulose is mainly a structural polysaccharide and a polymer of b-glucose e. none of the above are true
d
Evert Gorter used red blood cells (RBCs) in his experiment for several good reasons. Which reason below is the most important reason that he used RBCs? a. RBCs are easy to count under a microscope b. RBCs are easy to obtain from animals c. A large quantity of RBCs can be obtained from an animal without harming it d. within an individual organism all RBCs are the same size e. none of the above
d
Evert Gorter's experiment with red blood cells demonstrated? a. the cell membranes were made of phospholipids b. that the nuclear envelope is a double lipid bilayer c. the fluid mosaic model of plasma membranes d. that plasma membranes are phospholipids bilayers e. none of the above
d
One water molecule can hydrogen bond with a maximum of ___ other water molecules. a. 1 b. 2 c. 3 d. 4 e. 5
d
What best describes the nature of the nuclear membrane? a. a phospholipid monolayer b. a phospholipid bilayer c. a phospholipid trilayer d. a double phospholipid bilayers
d
What statement below best describes nonpolar molecules? a. nonpolar molecules are hydrophilic and can mix with water molecules b. nonpolar molecules are hydrophilic and do not mix with water molecules c. nonpolar molecules are hydrophobic and can mix with water molecules d. nonpolar molecules are hydrophobic and do not mix with water molecules
d
Where precisely are ribosomes assembled in eukaryotic cells? a. the golgi b. the rough ER c. the nucleus d. the nucleolus
d
Which of the following characterize a single water molecule? a. it is nonpolar b. the electronegativity of the oxygen atom is significantly lower than that the electronegativity of the hydrogen atoms c. It contains two hydrogen bonds d. Its oxygen atom has a partial negative charge e. both C and D characterize a single water molecule
d
Which of the following have no physical contact with the plasma membrane of cells? a. the extracellular matrix b. the cytoskeleton c. integral proteins d. all of the above make physical contact with the plasma membrane of cells e. A and B
d
You arrive late to a biological seminar. However, just as you enter the room you hear the speaker say that the macromolecules are "single stranded". Using that information, you conclude that the speaker is probably talking about a. proteins b. phospholipids c. DNA d. RNA e. none of the above
d
What are the monomers of a triglyceride? a. monosaccharides b. amino acids c. nucleotides d. glycerol, fatty acids, and phosphate e. glycerol and fatty acids
e
Which of the following are found in all prokaryotic and eukaryotic cells? a. plasma (cell) membrane b. ribosomes c. cell wall d. all of the above e. only A and B are found in all prokaryotes and eukaryotes
e
Which of the following is NOT a function associated with proteins? a. proteins can function as enzymes b. proteins can function as signaling molecules c. proteins can function as structural molecules d. proteins can function as transport molecules e. all of the above are functions associated with proteins
e
Which of the following is true of lysosomes? a. they are released from the cis face of the Golgi b. lysosomes may be used to break down "worn out" organelles c. lysosomes contain enzymes that hydrolyze polymers d. all of the above are true of lysosomes e. only B and C above are true of lysosomes
e
