Suppose, evolution on earth had occurred in such a way that there are 96 amino acids instead of 20. DNA has 12 different types of bases and DNA synthesis occurs in the same way as today. The minimum number of bases per DNA codon would be

(1) 12

(2) 8

(3) 2

(4) 3

Subtopic:  The DNA | Genetic Code: I | Genetic Code |
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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

 58%
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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

Subtopic:  Genetic Code: III | Translation | Genetic Code |
 71%
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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

 

Subtopic:  DNA Fingerprinting |
 61%
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Okazaki is known for his contribution to the understanding of

(1) transcription

(2) translation

(3) DNA replication

(4) mutation

Subtopic:  DNA Replication:III | DNA Replication |
 79%
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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

Subtopic:  Search for Genetic Material:I | Search for Genetic Material |
 88%
From NCERT
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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%

Subtopic:  The DNA |
 68%
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AUG codes for

(1) valine

(2) histidine

(3) phenylalanine

(4) methionine

Subtopic:  Genetic Code: III | Genetic Code |
 91%
From NCERT
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In the lac operon model, lactose molecules function as:-

(1) inducers, which bind with the operator
gne

(2) repressors, which bind with the operator
gene

(3) inducers, which bind with the repressor
protein

(4) corepressors, which bind with repressors
protein

Subtopic:  Gene Regulation: Lac Operon |
 72%
From NCERT
AIIMS - 2012
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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

 70%
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