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ICMR JRF Model Questions and Answers

ICMR JRF exam Model Questions : Section A
icmr jrf exam
1. Which is a typical example of insect pollination?
a) Pisum sativum
b) Salvia splenderis
c) Brassica campesteris
d) Cicer arietinum
2. Spawn is
a) a type of mushroom
b) at ype of SCP
c) inoculum in mushroom culture
d)a type of yeast powder
3. Enzyme alcohol dehydrogenase belong to the class
a) lyase
b) transferase
c) hydrolase
d) oxidoreductase
4. Which one of the following is not a water soluble vitamin?
a) Thiamine
b) Riboflavin
c) Pyrioxine
d) alpha Tocopherol
5.  N acetylmuramic acid is a component of
a) Chloroplast membrane
b) bacterial cell wall
c) fungal cell wall
d) mitochondrial memebrane
Section B
6. Whine one of the following enzymes does not catalyze a physiologically irreversible step in glycolysis?
a) Hexokinase
b) Phosphofructokinase
c) pyruvate kinase
d) phosphoglycerate kinase
7. Which of the following processes does not occur in mitochondria of mammalian cells?
a) Protein synthesis
b) DNA synthesis
c) Fatty acid synthesis
d) β oxidation of fatty acids
8. How many turns of a DNA double helix must be unwound during replication of E.coli chromosome?
a) 4.6 x106
b) ) 4.6 x105
c) ) 4.6 x104
d) ) 4.6 x107
9. Which of the following is a connecting link between glycolysis and Kreb’s cycle?
a) Citric acid
b) Glucose
c) Pyruvic acid
d) Acetyl Co A
10. Cyanide poisoning affects which of the following processes?
a) Electron transport chain
b) Fatty acid biosynthesis
c) Fatty acid oxidation
d) Nucleic acid biosynthesis
11. At what phase of bacterial growth, antibiotics are usually most effective?
a) Lag phage
b) Log phase
c) Stationary phase
d) Late lag phase
12. When tryptophan accumulates in a bacterial cell
a) it binds to the operator, preventing transcription of adjacent genes
b) it binds to the promoter, allowing transcription of adjacent genes.
c) it binds to the repressor, causing it to bind to the operon
d) it binds to RNA and initiates a negative feedback loop to reduce transcription
13. Control of genes expression in eukaryotes including all of the following, except
a) DNA methylation
b) Activation of transcription factors
c) feed back inhibition of enzyme activity
d) Activation of transcription factors
14. RNA interference (RNA) inhibits
a) RNA synthesis of specific genes
b) Transcription of all genes
c) Recognition of the promoter by RNA polymerase
d) translation of specific mRNAs
15. Phenylketonuria is an example of a genetic disease in which
a) a single enzyme is not functional
b) Inheritance is sex linked
c) a transport protein does not work properly
d) two parents without the disease cannot have a child with the disease
d) a transport protein does not work properly
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Answers
1. c) Brassica campesteris
2. c) inoculum in mushroom culture
3. d) oxidoreductase
4. d) alpha Tocopherol
5. b) bacterial cell wall
6. d) phosphoglycerate kinase
7. b) DNA synthesis
8. b) ) 4.6 x105
9. d) Acetyl Co A
10. a) Electron transport chain
11. b) Log phase
12. c) it binds to the repressor, causing it to bind to the operon
13. c) feed back inhibition of enzyme activity
14. d) translation of specific mRNAs
15. a) a single enzyme is not functional

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