Regulation of lac operon can be visualised as regulation of enzyme synthesis by its

(1) substrate

(2)lactose

(3)carbohydrates

(4)All of these

Subtopic:  Gene Regulation: Lac Operon |
 56%
From NCERT
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Lac operon will be switched on when

(1) lactose is less in the medium

(2)glucose is enough in the medium

(3)lactose is less than glucose

(4)lactose is more than glucose

Subtopic:  Gene Regulation: Lac Operon |
 77%
From NCERT
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Repressor mRNA will be formed in

(1) absence of inducer

(2) presence of inducer

(3) both 1 and 2

(4) presence of lac mRNA

Subtopic:  Gene Regulation: Lac Operon |
From NCERT
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The order and sequence of amino acids are defined by

(1) Nucleotides sequences in DNA

(2) Nucleotides sequences in mRNA

(3) Nucleotides sequences in template strand of DNA

(4) Nucleotides sequences in non- template strand of DNA

Subtopic:  Translation |
 72%
From NCERT
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Formation of peptide bond is

(1) active process

(2) passive process

(3) both active and passive process

(4) neither active nor passive process

Subtopic:  Translation | Translation Mechanism |
 81%
From NCERT
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Which of the following is incorrect for protein synthesis

(1) Ribosomes are the cellular for protein synthesis

(2) 23s rRNA act as catalyst for peptide bond formation in all organisms

(3) UTR are required for efficient translation process

(4) The ribosome proceeds to the elongation phase of protein synthesis

Subtopic:  Translation |
 63%
From NCERT
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In bacteria catalytic RNA is found in

(1) 60S subunit of ribosome

(2) 40S subunit of ribosome

(3) 30S subunit of ribosome

(4) 50S subunit of ribosome

Subtopic:  Translation |
 51%
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Untranslated regions (UTRs) are present

(1) before and after the stop codon

(2) after the start codon and before the stop codon

(3) before and after the start codon

(4) before the start codon and after the stop codon

Subtopic:  Translation |
 78%
From NCERT
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Polypeptides are

(1) dictated by DNA

(2)represented by mRNA

(3)Expresssion of t-RNA

(4)Both 1 and 2

Subtopic:  Translation | Translation Mechanism |
 70%
From NCERT
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Protein synthesis takes place in

(1) cytoplasm

(2) nucleoplasm

(3) Both 1 and 2

(4) none of these

Subtopic:  Translation |
 63%
From NCERT
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