A segment of DNA coding for a polypeptide is most accurately defined as:

(1) Operon

(2) Gene

(3) Recon 

(4) Cistron

Subtopic:  Transcription: III | Transcription |
 75%
From NCERT
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In eukaryotes the sequences that appear in mature or processed mRNA are called:

(1) Introns

(2) Cistrons

(3) Exons

(4) Mutons

Subtopic:  Transcription: III | Transcription |
 83%
From NCERT
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What facilitates the opening of the helix during elongation step of transcription?

(1) RNA polymerase

(2) Helicase

(3) Topoisomerase

(4) Gyrase

Subtopic:  Transcription: III | Transcription |
 57%
From NCERT
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Which of the following helps in termination of transcription?

(1) Sigma factor

(2) Translocase

(3) Ubiquitin

(4) Rho factor

Subtopic:  Transcription: III | Transcription |
 93%
From NCERT
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Transcription and translation can be coupled in:

(1) Bacteria

(2) Yeast

(3) Plants

(4) Animals

Subtopic:  Translation |
 90%
From NCERT
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In eukaryotes RNA polymerase II transcribes:

(1) mRNA

(2) rRNA

(3) tRNA

(4) hnRNA

Subtopic:  Transcription: IV | Transcription |
 72%
From NCERT
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What is added to the 5’ end of hnRNA in Eukryotes?

1. Poly A tail

2. Methyl cytosine triphosphate

3. Methyl guanosine triphosphate

4. Poly U tail

Subtopic:  Transcription: IV | Transcription |
 85%
From NCERT
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Some amino acids are coded by more than one codon. Hence genetic code is:

(1) Unambiguous

(2) Non specific

(3) Degenerate

(4) Universal

Subtopic:  Genetic Code: III | Genetic Code |
 80%
From NCERT
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In actual structure, tRNA is a compact molecule which looks like a/an:

(1) Clover leaf

(2) Rail road

(3) Inverted L

(4) Alpha helix

Subtopic:  Translation |
 73%
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Which of the following anticodons will hybridize with the mRNA codon 5’ – AUG – 3’?

1. 5’ – UAC – 3’

2. 5’ – TAC – 3’

3. 3’ – UAC – 5’

4. 3’ – TAC – 5’

Subtopic:  Translation Mechanism |
 69%
From NCERT
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