DNA polymerase:
A. Is the main enzyme for RNA synthesis
B. Is DNA dependent DNA polymerizing enzyme
C. Is highly efficient enzyme
D. Is catalyses reaction with high degree of accuracy
(a) C, D              (b) A, B, C, D                (c) B, C, D             (d) A, B, C

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The difference(s) between mRNA and tRNA is / are that:
A. mRNA has more elaborated 3-dimensional structure due to extensive base-pairing.
B. tRNA has more elaborated 3-dimensional structure due to extensive pairing.
C. tRNA is usually smaller than mRNA.
D. mRNA bears anticodon but tRNA has codons.
(a) A, C                   (b) A, B, C, D                 (c) B, C                    (d) A, B, C

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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
(a) A, C               (b) A, B, C, D                  (c) B, C, D                     (d) A, B, C

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In prokaryotes, gene regulation occurs at the level of:

(a) Transcription                                (b) Translation

(c) Post transcription                          (d) Post translation

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Characteristic(s) of most DNA is / are:
A. A pairs with T by 2 hydrogen bonds.
B. Antipolarity of complementary chains
C. 20Ao diameter
D. 10 bps / turn
(a) A, C                  (b) A, B, C, D                      (c) B, C, D                 (d) A, B, C

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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.
(a) All correct                    (b) All incorrect
(c) A, B, D are correct        (d) B, C, D are correct

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Which one(s) is / are correct?
A. In prokaryotes single type of RNA polymerase can transcribe mRNA, tRNA and rRNA.
B. In eukaryotes RNA polymerase I transcribes rRNA (28s, 18s and 5.8s) whereas RNA pol III is responsible for transcription of tRNA, 5s rRNA and RNAs.
C. RNA pol II transcribes HnRNA in eukaryotes.
D. Ribosomal large subunit has p and A-sites.
(a) A, C                (b) A, B, C, D                  (c) B, C, D                  (d) A, B, C

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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

(a)

RNA

Non histone

Histone

(b)

DNA

H1 histone

Histone Octamer

(c)

RNA

Histone Octamer

H1 histone

(d)

DNA

Non histone

Histone

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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

(a)

Terminator

Transcription start site

Promoter

Template strand

Coding strand

(b)

Promoter

Transcription start site

Terminator

Coding strand

Template strand

(c)

Promoter

Transcription start site

Terminator

Template strand

Coding strand

(d)

Terminator

Transcription start site

Promoter

Coding strand

Template strand

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The fact that the genetic code is almost universal in living organisms is considered to be evidence that all organisms:
(a) Are evolutionarily related
(b) Are genetically identical
(c) Have the same sequence of anticodons
(d) None of the above

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