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If a peptide is 160 amino acids long, How many GTP and ATP molecules does it use for elongation?

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If a peptide is 160 amino acids long, How many GTP and ATP molecules does it use for elongation?

(a) 318 GTP + 160 ATP

(b) 478 GTP + 160 ATP

(c) 320 GTP+ 320 ATP

(d) 478 GTP+ 320 ATP

I had been asked this question during an interview for a job.

Question is taken from Elongation and Termination in portion Gene Expression : Translation of Cytogenetics

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Right choice is (a) 318 GTP + 160 ATP

Easiest explanation: There are 159 translation steps from initiation to termination. Each step has an input of 2 GTP in form of EF-Tu and Ef-G. For all 160 amino acids we have to charge it with 160 ATP.

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