First slide

Transcription

Question

Identify the correct match:

Easy

A

Lac y - β-galactosidase.
B

Repressor of lac operon - Chemically a carbohydrate.
C

Methionine - Has degenerate codon.
D

5’ GAATTGGCC 3’ Coding strand- Sequence on mRNA 5’ GAAUUGGCC 3’

Solution

The coding strand has the same sequence as is present in the mRNA only thymine is replaced by uracil. Hence, if the coding strand has the sequence 5’GAATTGGCC 3’ then the sequence on mRNA would be 5’ GAAUUGGCC 3’. Lac y codes for the enzyme permease that increases the permeability of the cell to $β$ -galactosides. The Lac i gene synthesizes the repressor protein. Methionine has only one codon and hence it is a non-degenerate codon.

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