1. Which of the following is typically transcribed but not translated? A. Intron

Question

1. Which of the following is typically transcribed but not translated?

A. Introns B. Stop codon C. Genes for transfer RNA D. All of the above

2. A mature mRNA contains 303 nucleotides. What is the maximum number of amino acids in the polypeptide after translation?

A. 303 B. 909 C. 100 D. 101

3. A polypeptide contains ten amino acids. What is the minimum number of nucleotides in the mRNA encoding this polypeptide?

A. 10 B. 30 C. 11 D. 33

4. The ‘E’ site on the ribosome is:

A The exit site, where uncharged tRNAs leave the ribosome B. The elongation site, where the polypeptide chain grows as new amino acids are added C. The entry site, where charged tRNA molecules bring in a new amino acid

Explanation / Answer

The answers are as provided below

1) D) all of the above

2) C) 100 as 3 nucleotide forms a codon which code for a single amino acid and there must be a stop codon at the end which does not code for any amino acid.

3) D) 33 for the same reason as answer 2.

4) A) The exit site, where uncharged tRNAs leave the ribosome.

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