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MCQs

Total Questions : 244 | Page 23 of 25 pages
Question 221. The glycolytic pathway (glucose → 2 pyruvate) is found
  1.    in all living organisms
  2.    primarily in animals excluding particles
  3.    only in eukaryotes
  4.    only in yeast
 Discuss Question
Answer: Option A. -> in all living organisms
Answer: (a).in all living organisms
Question 222. Glycolytic pathway regulation involves
  1.    allosteric inhibition by ATP
  2.    feedback, or product, inhibition by ATP
  3.    allosteric stimulation by ADP
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 223. The released energy obtained by oxidation of glucose is stored as
  1.    a concentration gradient across a membrane
  2.    NAD+
  3.    ATP
  4.    ADP
 Discuss Question
Answer: Option C. -> ATP
Question 224. A kinase is an enzyme that
  1.    removes water from a double bond
  2.    removes phosphate groups of substrates
  3.    uses ATP to add a phosphate group to the substrate
  4.    uses NADH to change the oxidation state of the substrate
 Discuss Question
Answer: Option C. -> uses ATP to add a phosphate group to the substrate
Question 225. Why does the glycolytic pathway continue in the direction of glucose catabolism?
  1.    There are essentially three irreversible reactions that act as the driving force for the pathway
  2.    Glycolysis occurs in either direction
  3.    The enzymes of glycolysis only function in one direction
  4.    High levels of ATP keep the pathway going in a forward direction
 Discuss Question
Answer: Option A. -> There are essentially three irreversible reactions that act as the driving force for the pathway
Question 226. During catabolism, only about 40% of the energy available from oxidizing glucose is used to synthesize ATP. Remaining 60%
  1.    is used to reduce NADP
  2.    remains in the products of metabolism
  3.    is lost as heat
  4.    is stored as fat.
 Discuss Question
Answer: Option C. -> is lost as heat
Question 227. The active form of glycogen phosphorylase is phosphorylated, while the dephosphorylation of which active form occurs?
  1.    Glycogen semisynthase
  2.    Glycogen dehydrogenase
  3.    Glycogen hydrolase
  4.    Glycogen synthase
 Discuss Question
Answer: Option D. -> Glycogen synthase
Question 228. The enzymes of glycolysis in a eukaryotic cell are located in the
  1.    mitochondrial matrix
  2.    cytosol
  3.    intermembrane space
  4.    plasma membrane
 Discuss Question
Answer: Option B. -> cytosol
Question 229. For every one molecule of sugar glucose which is oxidized __________ molecule of pyruvic acid are produced.
  1.    2
  2.    4
  3.    1
  4.    3
 Discuss Question
Answer: Option A. -> 2
Question 230. In the glycogen synthase reaction, the precursor to glycogen is
  1.    glucose-6-P
  2.    UDP-glucose
  3.    glucose-1-P
  4.    UTP-glucose
 Discuss Question
Answer: Option B. -> UDP-glucose

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