pg. 1
ACS BIOCHEMISTRY EXAM LATEST 2025- 2026 TEST BANK
|COMPLETE 350 ACCURATE QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT ANSWERS) |
ALREADY GRADED A+
Which of the following donates electrons to mitochondrial cytochrome oxidase?
- Plastocyanin
- Plastoquinone
- Cytochrome c
- Cytochrome b
- Ubiquinone - Correct Answer - C
Which of the following donates electrons to P700 of Photosystem I?
- Cytochrome b
- Cytochrome c
- Ubiquinone
- Plastoquinone
- Plastocyanin - Correct Answer - E
Which of the following intermediates is a substrate for the only membrane-associated enzymatic activity in the TCA cycle?
- Fumarate
- Oxaloacetate
- Succinate
- Citrate
- Pyruvate - Correct Answer - C
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pg. 2 Which of the following is NOT a consequence of increased cellular levels of cAMP?
- Inhibition of glycogen synthesis
- Activation of a kinase cascade
- Activation of the transducing G-protein
- Dissociation of the cAMP-dependent protein kinase tetramer
- Increased phosphorylation of glycogen phosphorylase - Correct Answer - C
Which of the following is NOT an intermediate of the citric acid cycle?
- Acetyl-CoA
- Oxaloacetate
- Succinyl-CoA
- Citrate - Correct Answer - A
d.α-Ketoglutarate
Which of the following is the hydrophobic electron carrier which is mobile within the membrane?
- Cytochrome c
- Ubiquinone
- Cytochrome b
- Cytochrome a
- Complex II - Correct Answer - B
Which of the following does not describe hemoglobin?
- Hemoglobin is an oxygen transport protein.
- Hemoglobin is an allosteric protein.
- Hemoglobin has quaternary structure.
- Copper ions are important in hemoglobin's ability to bind oxygen.
- Hemoglobin is composed, in part, of an iron containing heme group. - Correct
Answer - D 2 / 4
pg. 3 Which of the following would allow you to determine the isoelectric point of a protein?
- protein quaternary structure
- protein solubility as a function of pH
- protein size
- protein shape
- protein tertiary structure - Correct Answer - B
Under physiological conditions, which of the following processes is not an important method for regulating the activity of enzymes?
- Phosphorylation.
- Temperature changes.
- Adenyl addition.
- Disulfide reduction.
- Partial proteolysis. - Correct Answer - B
Which of the following will probably not affect the rate at which an intermediate in a metabolic pathway is utilized by the appropriate enzyme?
- formation of a multienzyme complex involving the enzymes of the pathway
- increasing availability of the substrate for the first enzyme in the pathway
- a decrease in the concentration of the product of the last enzyme inD the pathway
- addition of water to the organism's growth medium E. increase the temperature
from 30° C to 37° C - Correct Answer - D
The conversion of glucose to maltose
- an equilibrium
- a hydrolysis reaction
- an dehydration process
- an epimerization 3 / 4
pg. 4
- a mirror image - Correct Answer - C
The use of nucleotides such as GTP in a metabolic reaction is energetically equivalent to the use of ATP. This is because the GDP that is produced is rephosphorylated to GTP at the expense of ATP by which of the following enzymes?
- adenylate kinase
- ATPase
- GTPase
- nucleoside diphosphate kinase
- phosphorylase a - Correct Answer - D
Which of the following intermediates is a substrate for the only membrane-associated enzymatic activity in the TCA cycle?
- citrate
- fumarate
- oxaloacetate
- pyruvate
- succinate - Correct Answer - E
The ultimate acceptor of the electrons removed by oxidative decarboxylation in the TCA cycle is
A. NAD+
B. NADP+
C. FAD
D. ATP
- O2 - Correct Answer - E
Which of the following is the hydrophobic electron carrier which is mobile within the membrane?
- ubiquinone
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