Biology 006 - Genera Biology I » Spring 2021 » Exam 3 (2)

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Question #1
Which is an immediate effect of blocking the activity of mitochondrial ATP synthase?
A.   The pH in the space between the mitochondrial membranes would decrease.
B.   The concentration of NADH would increase.
C.   Oxygen consumption would decrease.
D.   ATP synthesis would increase.
E.   The pH in the space between the mitochondrial membranes would increase.
Question #2
The gonads produce steroids. The specific steroid-producing organelle in gonad cells is ____________________________
A.   smooth endoplasmic reticulum.
B.   lysosomes.
C.   ribosomes.
D.   mitochondria.
E.   contractile vacuole.
Question #3
Sports physiologists at an Olympic training center wanted to monitor athletes to determine at what point their muscles were functioning anaerobically. They could do this by checking for the buildup of which molecule?
A.   carbon dioxide
B.   ATP
C.   oxygen
D.   ADP
E.   lactate
Question #4
If one were to double the amount of enzyme in a reaction that has a initial ΔG of -5 kcal/mole, what would the new ΔG be?
A.   -20 kcal/mole
B.   +10 kcal/mole
C.   -10 kcal/mole
D.   +5 kcal/mole
E.   -5 kcal/mole
Question #5
In a PET scan, a patient is injected with radioactively labeled glucose. Cells take up the radioactive glucose and the scanner detects levels of radioactivity in various parts of the body. This is a measure of the amount of glucose uptake. Cancer cells are often found in an environment with low oxygen concentration and they take in high amounts of glucose. Why would a low oxygen environment lead to high glucose uptake?
A.   The cancer cells rely more on glycolysis which is less efficient than oxidative phosphorylation.
B.   They rely more on oxidative phosphorylation which is less efficient than glycolysis.
C.   More energy is produced from glucose in hypoxic conditions.
D.   Enzymes function more efficiently in the absence of oxygen.
E.   Because the cancer cells require more oxygen to metabolize glucose.
Question #6
Using 14CO2 as a radioactive tracer for the Calvin cycle, which molecules would incorporate this tracer.
A.   1,3-biphosphoglycerate (1,3-BPG)
B.   glyceraldehyde-3-phosphate (G3P)
C.   ribulose biphosphate (RuBP)
D.   ribulose biphosphate (RuBP), glyceraldehyde-3-phosphate (G3P), 3-phosphoglycerate (3PG), and 1,3-biphosphoglycerate (1,3-BPG)
E.   NAPDH and rubisco
F.   3-phosphoglycerate (3PG)
Question #7
FtsZ, MreB, and CreS are proteins that regulate the shape and structure of prokaryotes like E. coli. Based on this, these three proteins are homologous (i.e. similar) to _________________________ found in eukaryotes.
A.   DNA processing enzymes
B.   cytoskeletal proteins
C.   extracellular matrix proteins
D.   organelles
E.   cell wall components
Question #8
During glycolysis, glucose is broken down into _______ molecules of _____. NOTE: use proper chemical nomenclature
A.   2, pyruvate
B.   pyruvate, 2
Question #9
Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed during the fermentation of glucose into lactic acid?
A.   38%
B.   5%
C.   0%
D.   50%
E.   100%
Question #10
Chaperones keep proteins destined for the mitochondrial matrix in their three dimensional active structure.
A.   FALSE
B.   TRUE

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