Out of 64 codons how many of them code for amino acids?

1. 64                            

2. 20                            

3. 61                            

4. 32

Subtopic:  Genetic Code: II | Genetic Code |
 90%
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Isotopes used in proving semiconservative replication of DNA were:

1. 14N 14C            

2. 14N 15N            

3. 14N 31P             

4. 14C 31P

Subtopic:  DNA Replication: I | DNA Replication |
 94%
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Bacterial nucleoid has:

1. One single-stranded DNA            

2. One double-stranded DNA

3. Two single-stranded DNA             

4. Many double-stranded DNAs

Subtopic:  DNA Replication: II | DNA Replication |
 61%
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Column-I                                        Column-II

I. Operator site                               (A) Binding site for RNA polymerase

II. Promoter site                             (B) Binding site for repressor molecule

III. Structural gene                         (C) Codes for enzyme protein

IV. Regulator gene                          (D) Code for repressor molecules

The correct match is:

1. I - B, II - A, III - C, IV - D         

2. I - B, II - A, III - D, IV - C

3. I - D, II - C, III - A, IV - B         

4. I - B, II - C, III - A, IV - D

Subtopic:  Gene Regulation: Lac Operon |
 78%
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In chromosome, DNA is associated with:

A. Negatively charged proteins       B. Positively charged proteins

C. Neutral proteins                        D. NHC protein

1. B, D                

2. A, B, C, D       

3. B, C, D            

4. A, B, C

Subtopic:  DNA Packaging |
 74%
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Heterochromatin:

A. Is more densely packed      B. Is stains dark

C. Is transcriptionally active    D. Is transcriptionally inactive

1. A, C                

2. A, B, C, D        

3. B, C, D            

4. A, B, D

Subtopic:  DNA Packaging |
 92%
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In eukaryotes the gene expression is regulated at:

A. Transcriptional level

B. Processing level

C. Transport of mRNA from nucleus to the cytoplasm

D. Translational level

1. A, C               

2. A, B, C, D                 

3. B, C, D                     

4. A, B, C

Subtopic:  Gene Regulation in Eukaryotes |
 82%
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In prokaryotes, gene regulation occurs at the level of:

1. Transcription                               

2. Translation

3. Post transcription                         

4. Post translation

Subtopic:  Gene Regulation: Introduction |
 84%
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A. DNA polymorphism plays important role in evolution and speciation.

B. 99.9% nucleotides bases are exactly same in all people

C. Chromosome 1 has the fewest genes (23) and Y-chromosomes has most genes (2968)

D. BAC and YAC have been used in Human Genome Project.

1. All correct                   

2. All incorrect

3. A, B, D are correct       

4. B, C, D are correct

Subtopic:  Human Genome Project |
 87%
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Go through the following diagram of Nucleosome (structural unit of chromatin). Identify its componential parts indicated by A, B and C:

 

A

B

C

1.

RNA

Non histone

Histone

2.

DNA

H1 histone

Histone Octamer

3.

RNA

Histone Octamer

H1 histone

4.

DNA

Non histone

Histone

Subtopic:  DNA Packaging |
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