GPB MCQ Quiz 156 for ICAR JRF/SRF/ARS Exam Preparation

In some eukaryotic cells an enzyme is found with reverse transcription activity is called

A) Telomerase

B) Reverse Transcriptase

C) Both

D) None of the above

Explanation: Telomerase is an enzyme found in some eukaryotic cells that has reverse transcription activity, extending telomeres by synthesizing DNA from an RNA template.

In the process of Translation start codon is

A) UAG

B) UGA

C) AUG

D) None of the above

Explanation: AUG is the start codon that signals the beginning of translation and codes for methionine.

In the process of Translation stop codon is

A) AUG

B) UGA

C) GUA

D) GAU

Explanation: UGA is one of the three stop codons (UAG, UAA, UGA) that signal the termination of translation.

In the operon model of gene regulation type of gene involved

A) Operator gene

B) Regulator gene

C) Structural gene

D) None of the above

Explanation: Structural genes in an operon code for proteins, enzymes, or RNA molecules and are regulated by operator and regulator genes.

Structural genes of lac operon are

A) lac Z, lac Y and lac V

B) lac Y, lac A and lac B

C) lac Z, lac Y and lac A

D) lac Z, lac A and lac C

Explanation: The lac operon structural genes include lac Z, lac Y, and lac A, which code for β-galactosidase, permease, and transacetylase, respectively.

Types of Operon model

A) Repressible operon

B) Inducible operon

C) Both

D) None of the above

Explanation: Operon models can be either inducible or repressible, depending on whether gene expression is activated or repressed in response to environmental signals.

The process of inhibition of transcription is called

A) Induction

B) Repression

C) Both

D) None of the above

Explanation: Repression is the process by which transcription of genes is inhibited, usually by a repressor protein binding to the operator region.

The term genetics was proposed by

A) N. Grew (1682)

B) William Bateson (1906)

C) Camerarius (1694)

D) Thomas Fairchild (1717)

Explanation: William Bateson proposed the term "genetics" in 1906 to describe the study of heredity and variation.

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