1) Which of the following statements concerning cellular metabolism is FALSE? |
c |
2) Anabolic reactions may be characterized as |
C |
3) Which of the following statements concerning reduction reactions is FALSE? |
D |
4) The molecule that an enzyme acts upon is known as its |
a |
5) Which of the following statements concerning enzymes is FALSE? |
B |
6) Sulfanilamide is an antimicrobial drug that mimics the shape of an important substrate for a particular bacterial enzyme, thereby inhibiting the enzyme. This type of inhibition is known as |
B |
7) Which of the following produces NADPH? |
E |
8) Which of the following statements concerning glycolysis is TRUE? |
C |
9) Carbon dioxide is a by-product of which of the following? |
A |
10) Pyruvic acid is a product of |
E |
11) All of the following are forms of oxidation EXCEPT |
D |
12) Which of the following can be the final electron receptor in anaerobic respiration in bacteria? |
D |
13) Which of the following types of carrier molecules is NOT found in electron transport chains? |
C |
14) All of the following are associated with chemiosmosis EXCEPT |
B |
15) Which of the following is a by-product of the catabolism of proteins? |
D |
16) What is the purpose of the light-dependent reactions of photosynthesis? |
A |
17) Which of the following is (are) common to chemiosmosis and the light-dependent reactions of photosynthesis? |
D |
18) Which of the following statements concerning the Krebs cycle is FALSE? |
C |
19) How many ATP molecules can be produced from the NADH generated by the catabolism of a molecule of glucose? |
B |
20) Types of chlorophyll differ in the |
E |
21) Membranes containing the photosystems necessary for photosynthesis are called |
A |
22) Beta-oxidation of fatty acids produces a substrate of |
D |
23) Which of the following is associated with the Calvin-Benson cycle? |
C |
24) What is the major product of the Calvin-Benson cycle that can then be used to form glucose? |
D |
25) Chemical reactions that can proceed toward either anabolism or catabolism are called |
E |
26) If a cell reverses the process of beta-oxidation, which of the following molecules will it make? |
C |
27) When a cell forms an amino acid by adding an amine group derived from ammonia to a precursor metabolite, this process is called |
A |
28) The conversion of amino acids to carbohydrates is an example of |
B |
29) All of the following are aspects of a cell’s ability to regulate its metabolism EXCEPT |
E |
30) The metabolic processes called fermentation |
C |
31) Which of the following is a TRUE statement concerning the structure and function of enzymes? |
E |
32) In which of the following stages of glycolysis is ATP made? |
C |
33) Where is the most ATP generated for most eukaryotic cells? |
D |
34) The conversion of pyruvic acid to acetyl-CoA can be described as __________, because a molecule of CO2 is produced as a by-product. |
A |
35) Although glycolysis requires an input of ATP, this pathway results in a net gain of two ATP; therefore it is a(n) __________ pathway. |
A |
36) Enzymes known as lyases participate in __________ reactions. |
B |
37) Reactions involving isomerases are |
D |
38) Reactions catalyzed by transferases are |
B |
39) Oxidoreductases participate in __________ reactions. |
C |
40) Hydrolases are generally involved in __________ reactions. |
b |
41) Reactions involving ligases are typically __________ reactions. |
A |
42) Substrate-level phosphorylation occurs during the __________ stage(s) of glycolysis. |
D |
43) The production of NADH takes place during the __________ stage(s) of glycolysis. |
A |
44) Glucose enters glycolysis at the __________ stage(s). |
C |
45) The intermediate known as DHAP is formed during the __________ stage(s) of glycolysis. |
B |
1) Reactions that are both catabolic and anabolic are amphibolic. |
A |
2) NAD+ and NADP+ are important examples of both coenzymes and electron carriers. |
A |
3) Environmental changes can result in the inactivation of enzymes. |
A |
4) As the concentration of substrate increases, the activity of the enzyme decreases. |
B |
5) Ribozymes are enzymes that cleave the subunits of the ribosome. |
B |
6) During chemiosmosis, electrons are pumped across a membrane to produce ATP. |
B |
7) Fermentation pathways provide a cell with an alternative way to regenerate NAD+ for glycolysis. |
A |
8) Glucose is used as an energy source only when proteins and fats are not available. |
B |
9) Essential amino acids are amino acids that cannot be synthesized by an organism and so must be provided as nutrients. |
A |
10) The pentose phosphate pathway generates all the necessary precursors for nucleotide biosynthesis. |
B |
1) ATP is produced by the phosphorylation of __________. |
Answer: ADP |
2) Another term for an organic catalyst is a(n) __________. |
Answer: enzyme |
3) A __________ reaction is one in which a molecule accepts an electron. |
Answer: reduction |
4) The __________ point of an enzyme is reached when all active sites have bound substrate molecules. |
Answer: saturation |
5) When a noncompetitive inhibitor molecule binds to a(n) __________ site on an enzyme, the shape of the active site changes so that the substrate molecules can no longer bind. |
Answer: allosteric |
6) During glycolysis, glucose is converted to __________ acid, a molecule that can be used in either fermentation or respiration pathways. |
Answer: pyruvic |
7) Electrons are transferred in the Krebs cycle in the form of __________ atoms to NAD+ and FAD. |
Answer: hydrogen |
8) The purpose of electron transport is to create a proton __________ across a membrane that can then be used to make ATP. |
Answer: gradient |
9) Anaerobic respiration involves the use of molecules other than oxygen as the final electron __________ in an electron transport chain. |
Answer: acceptor |
10) Laboratory fermentation tests often include a pH indicator because many bacteria produce __________ as they ferment carbohydrates. |
Answer: acids |
11) The __________ generate amino acids from carbohydrate precursors and glutamic acid. |
Answer: transaminases |
12) A(n) __________ is a collection of pigments such as chlorophyll that are used to absorb light in the light-dependent reactions of photosynthesis. |
Answer: photosystem |
13) Waste products such as sulfur are produced by __________ photosynthetic bacteria as they obtain electrons for noncyclic photophosphorylation. ` |
Answer: anoxygenic |
14) Enzymes increase the rate of reaction by lowering the __________ energy. |
Answer: activation |
15) During electron transport in chloroplast thylakoids, protons are pumped outside the thylakoid into a space called the __________. |
Answer: stroma |
micro practice chapter 5 test
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