GPB MCQ Quiz 155 for ICAR JRF/SRF/ARS Exam Preparation

Important experiment which supports that DNA replication is semi-conservative

A) Meselson and Stahl experiment

B) Cairns experiment

C) Taylor’s experiment

D) All of the above

Explanation: The Meselson and Stahl experiment demonstrated that DNA replication is semi-conservative, where each new DNA molecule consists of one old and one new strand.

Components of RNA are

A) Nitrogenous base, Ribose sugar

B) Ribose Sugar, Phosphate group

C) Nitrogenous base, Phosphate group

D) Nitrogenous base, Ribose sugar and Phosphate group

Explanation: RNA is composed of a nitrogenous base, a ribose sugar, and a phosphate group.

The RNA which constitutes about 80% of the total cellular RNA is

A) R-RNA

B) M-RNA

C) T-RNA

D) M-RNA and T-RNA

Explanation: Ribosomal RNA (rRNA) makes up about 80% of total cellular RNA and is essential for ribosome structure and function.

Synthesis of DNA from RNA molecule is called

A) Reverse transcription

B) Transcription

C) Both

D) None of the above

Explanation: Reverse transcription is the process by which DNA is synthesized from an RNA template.

The mechanism of transcription consists

A) Initiation and Termination

B) Elongation and Termination

C) Initiation, Elongation and Termination

D) None of the above

Explanation: Transcription involves three main stages: initiation, elongation, and termination.

TFIID consists of

A) TBP

B) TAFs

C) Both

D) None of the above

Explanation: TFIID is a transcription factor complex composed of TBP (TATA-binding protein) and TAFs (TBP-associated factors), essential for transcription initiation.

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