Radioactive thymidene is fed to cells about to enter S-phase. It will make radioactive

(1) euchromatin

(2) heterochromatin

(3) Both (1) and (2)

(4) neither euchromatin nor heterochromatin

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What would happen, if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA?

(1) A polypeptide of 49 amino acids will be formed

(2) A polypeptide of 25 amino acids will be formed

(3) A polypeptide of 24 amino acids will be formed

(4) Two polypeptides of 24 and 25 amino acids will be formed

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Which one of the following set meaning is not different?

(1) Cistron

Triplet

(2) DNA profile

DNA type

(3) Gene pool

Genome

(4) Gene

Codon

 

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Okazaki is known for his contribution to the understanding of

(1) transcription

(2) translation

(3) DNA replication

(4) mutation

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The beginning of understanding genetic transformation in bacteria was made by

(1) Frederick Griffith

(2) Hershey and Chase

(3) Watson and Crick

(4) TH Morgan

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If the total amount of adenine and thymine in a double-stranded DNA is 45%, the amount of guanine in this DNA will be

(1) 22.5%

(2) 27.5%

(3) 45%

(4) 55%

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AUG codes for

(1) valine

(2) histidine

(3) phenylalanine

(4) methionine

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In the lacoperon model, lactose molecules function as:-

(a) inducers, which bind with the operator
gene

(b) repressors, which bind with the operator
gene

(c) inducers, which bind with the repressor
protein

(d) corepressors, which bind with repressors
protein

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A recessive mutant is one which is

(1) not expressed

(2) rarely expressed

(3) expressed only in homozygous and hemizygous state

(4) expressed only in heterozygous state

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If the total amount of adenine and thymine in a double-stranded DNA is 60%, the amount of guanine in this DNA will be

(1) 15%

(2) 20%

(3) 30%

(4) 40%

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