Questions and answers for exam Preparation

MCQs

Total Questions : 193 | Page 9 of 20 pages

Question 81. The glycosidic bond

in maltose is not hydrolyzed in lactose intolerant humans
in sucrose is hydrolyzed by bees
joins glucose and fructose to form sucrose
both (b) and (c)

Discuss Question

Answer: Option D. -> both (b) and (c)
Answer: (d).both (b) and (c)

Question 82. Which of the following does not occur during gluconeogenesis?

The carboxylation of pyruvate to oxaloacetate
The conversion of pyruvate to phosphoenolpyruvate (PEP)
The decarboxylation of oxaloacetate to phosphoenolpyruvate
The conversion of PEP to fructose bisphosphate

Discuss Question

Answer: Option B. -> The conversion of pyruvate to phosphoenolpyruvate (PEP)
Answer: (b).The conversion of pyruvate to phosphoenolpyruvate (PEP)

Question 83. The function of gluconeogenesis is

maintenance of blood glucose levels during starvation or a low carbohydrate diet
recovery of lactate from fermentation and glycerol from fat breakdown
a pathway for the utilization of amino acids
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 84. Which of the following characteristic enzymes of gluconeogensis is not found in the cytosol?

Pyruvate carboxlyase
Fructose-l,6-bisphosphatase
Both (a) and (b)
Glucose-6-phosphatase

Discuss Question

Answer: Option A. -> Pyruvate carboxlyase
Answer: (a).Pyruvate carboxlyase

Question 85. What is the consensus N-glycosylation site in a protein sequence?

Asn-Xaa-(Ser or Thr)
(Ser or Thr)-Asn-Ala
Thr-(Asn or Gln)-Ala
None of these

Discuss Question

Answer: Option A. -> Asn-Xaa-(Ser or Thr)
Answer: (a).Asn-Xaa-(Ser or Thr)

Question 86. The process not involved in the formation of glucose by gluconeo-genesis is

the conversion of oxaloacetate to glucose
the conversion of lactate to pyruvate
the dephosphorylation of glucose-6-phosphate
all of the above

Discuss Question

Answer: Option A. -> the conversion of oxaloacetate to glucose
Answer: (a).the conversion of oxaloacetate to glucose

Question 87. Fructose diphosphate accumulation would

inhibit glycolysis and gluconeogenesis
stimulate glycolysis and gluconeogenesis
stimulate glycolysis and inhibit gluconeogenesis
inhibit glycolysis and stimulate gluconeogenesis

Discuss Question

Answer: Option C. -> stimulate glycolysis and inhibit gluconeogenesis
Answer: (c).stimulate glycolysis and inhibit gluconeogenesis

Question 88. Patients suffering from Von Gierke's disease are unable to perform gluconeogeneis because they have a defective

lactate dehydrogenase
glucose 6 phosphatase
pyruvate carboxylase
none of these

Discuss Question

Answer: Option B. -> glucose 6 phosphatase
Answer: (b).glucose 6 phosphatase

Question 89. The multistep pathways of metabolism are efficient because they

locate all of the enzymes for a pathway in the same place within the cell
use the same substrate for all of the enzymes in the pathway
use the same enzyme for all of the substrates in the pathway
spread the enzymes for a pathway into several different organelles

Discuss Question

Answer: Option A. -> locate all of the enzymes for a pathway in the same place within the cell
Answer: (a).locate all of the enzymes for a pathway in the same place within the cell

Question 90. Metabolic reactions that break down complex molecules into smaller compounds, thereby releasing usable energy for the cell, are best described as