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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Following is the schematic structure of transcription unit having some important components indicated by A, B, C, D and E. In which of four option the components are identified correctly:

 

A

B

C

D

E

1.

Terminator

Transcription start site

Promoter

Template strand

Coding strand

2.

Promoter

Transcription start site

Terminator

Coding strand

Template strand

3.

Promoter

Transcription start site

Terminator

Template strand

Coding strand

4.

Terminator

Transcription start site

Promoter

Coding strand

Template strand

Subtopic:  Transcription:II | Transcription |
 79%
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The fact that the genetic code is almost universal in living organisms is considered to be evidence that all organisms:

1. Are evolutionarily related

2. Are genetically identical

3. Have the same sequence of anticodons

4. None of the above

Subtopic:  Genetic Code: III | Genetic Code |
 67%
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In the following diagram of the lac operon, an operon for inducible enzymes, identify components and enzymes:

 

X

Y

E1

E2

E3

1.

Repressor protein

Inducer (lactose)

â-Galactosidase

Permease

Transacetylase

2.

Inducer (lactose)

Repressor protein

â-Galactosidase

Permease

Transacetylase

3.

Repressor protein

Inducer (lactose)

â-Galactosidase

Transacetylase

Permease

4.

Repressor protein

Inducer (lactose)

Permease

Transacetylase

â-Galactosidase

Subtopic:  Gene Regulation: Lac Operon |
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Alfred Hershey and Martha Chase made a big contribution in proving DNA role as the hereditary molecule. The experiment is shown in the diagram. A and C are the presence or absence of radioactivity detected in cells B and D are the presence or absence of radioactivity detected in supernatants cells. Identify A, B, C and D:

1. A - No Radioactivity (35S) detected in cells; B - Radioactivity (32P) detected in supernatant; C - Radioactivity (35S) detected in cells; D - No Radioactivity in supernatant

2. A- Radioactivity (35S) detected in cells; B - No Radioactivity (35S) detected in supernatant; C - Radioactivity (32P) detected in cells; D - No Radioactivity in supernatant

3. A - No Radioactivity (35S) detected in cells; B - Radioactivity (35S) detected in supernatant; C - Radioactivity (32P) detected in cells; D - No Radioactivity in supernatant

4. A - No Radioactivity (35S) detected in cells; B - Radioactivity (35S) detected in supernatant; C - No Radioactivity (32P) detected in cells; D - Radioactivity in supernatant

Subtopic:  Search for Genetic Material: II | Search for Genetic Material |
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