BIOL 2160 : Biop Test 1 Review
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Question 1
Which of the following statements regarding photosynthesis and cellular respiration is true?
A. | Photosynthesis occurs in mitochondria, and cellular respiration occurs in chloroplasts. | |
B. | Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria. | |
C. | Photosynthesis occurs in mitochondria and in chloroplasts. |
Question 2
How do cells capture the energy released by cellular respiration?
A. | They produce glucose | |
B. | The energy is coupled to oxygen | |
C. | They produce ATP |
Question 3
During redox reactions
A. | the loss of electrons from one molecule is called reduction | |
B. | electrons are lost from one substance and added to another substance | |
C. | protons from one molecule replace the electrons lost from another molecule |
Question 4
Oxidation is the ________, and reduction is the ________.
A. | gain of oxygen; loss of oxygen | |
B. | loss of electrons; gain of electrons | |
C. | gain of protons; loss of protons |
Question 5
During cellular respiration, NADH
A. | delivers its electron load to the first electron carrier molecule. | |
B. | is chemically converted into ATP | |
C. | is the final electron acceptor |
Question 6
A drug is tested in the laboratory and is found to create holes in both mitochondrial membranes. Scientists suspect that the drug will be harmful to human cells because it will inhibit
A. | the citric acid cycle only. | |
B. | glycolysis only | |
C. | the citric acid cycle and oxidative phosphorylation |
Question 7
Which of the following metabolic pathways is common in aerobic and anaerobic metabolism?
A. | glycolysis | |
B. | the citric acid cycle | |
C. | electron transport chain |
Question 8
Which of the following is a result of glycolysis?
A. | production of CO2 | |
B. | a net loss of two ATPs per glucose molecule | |
C. | conversion of glucose to two three-carbon compounds |
1. Which statement comparing chloroplasts and mitochondria is true?
Chloroplasts and mitochondria each contain two membranes. | |
None of these statements are true. | |
Chloroplasts pump protons outside the organelle, while mitochondria pump protons inside the inner part of the organelle. | |
Chloroplasts and mitochondria use electrons from NADH to create a proton gradient. | |
Chloroplasts and mitochondria use energy from a proton gradient to make ATP. |
2. Approximately how many more ATPs are made from one glucose molecule under aerobic conditions with oxidative phosphorylation than under anaerobic conditions?
104 | |
0 | |
2 | |
30 |
3. As a cyclic pathway, why doens't the citrate cycle stop functioning when citrate cycle intermediates are siphoned off for use by other pathways?
Heme degradation produces succinyl-CoA, which is sufficient to restore the downstream citrate cycle intermediates that may be lacking. | |
Citrate cycle intermediates are constantly imported into the mitochondria from the cytosol, so these metabolites are never in low abundance. | |
Anaplerotic reactions catalyze the formation of citrate cycle intermediates, which can then enter the citrate cycle and maintain a functioning pathway. | |
Oxaloacetate is the only citrate cycle intermediate that leaves the pathway, and it is replenished by pyruvate carboxylase. |