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Biology
Molecular Basis of Inheritance
200 questions from 38 papers, each with its answer.
- 200 questions
- 38 papers
- 5.67% of Biology
Regulation of Gene Expression – Lac Operon
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Which of the following is required as inducer(s) for the expression of $lac$ operon?
Lactose (allolactose) induces the lac operon.
The $lac$ operon consists of one regulatory gene and three structural genes needed to metabolise lactose. It is induced by lactose (inducible operon), so lactose is the inducer.
DNA fingerprinting – techniques
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Which of the following is not required for any of the techniques of DNA fingerprinting available at present?
Fingerprinting uses restriction enzymes, hybridisation and PCR.
A zinc finger is a small protein motif forming a DNA-binding domain found in several transcription factors. Zinc finger analysis is not required for techniques of DNA fingerprinting.
Genetic code – start and stop codons
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Which one of the following is the start codon?
AUG is the initiation codon.
The genetic code is a triplet code; 64 codons code for 20 amino acids. AUG is the start codon; UAA, UAG and UGA are stop codons.
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