KCET · BIOLOGY · STD 12 - 5. Molecular Basis of Inheritance

The codon on mRNA are CAU-CCU-AAA-CUG. Identify the correct sequence of amino acids.

A His-Pro-Lys-Leu
B Pro-His-Lys-Leu
C His-Pro-Leu-Lys
D Pro-Leu-Lys-His

Verified Solution

Answer & Solution

Correct Answer

(A) His-Pro-Lys-Leu

Step-by-step Solution

Detailed explanation

(A) His-Pro-Lys-Leu,
CAU code for histidine (His), CCU codes for proline (Pro), AAA stands for lysine (Lys) and CUG stands for leucine (Leu).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Match the stages of prophase I given in Column-I with their features in Column-II and choose the correct options from the choices given below:

Column I	Column II
A. Leptotene	i. Exchange of genetic materials between nonsister chromatids of the homologous chromo-somes.
B. Zygotene	ii. Chromosomes visible under light microscope
C. Pachytene	iii. Dissolution of synaptonemal complex
D. Diplotene	iv. Chromosomes start pairing to-gether
E. Diakinesis	v. Terminalisation of chiasmata

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