MCAT Biology : Genetic Regulation and Transcription Factors

Study concepts, example questions & explanations for MCAT Biology

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Example Questions

Example Question #8 : Genetics

Which of the following refers to the region of RNA responsible for binding ribosomes during prokaryotic translation?

Possible Answers:

TATA box

Terminator

Promoter

Shine-Dalgarno sequence

Correct answer:

Shine-Dalgarno sequence

Explanation:

The Shine-Dalgarno sequence is located just upstream of the start codon on a strand of prokaryotic RNA. The sequence functions to bind the rRNA of the ribosome, recruiting it to the proper location to initial translation.

Example Question #9 : Genetics

Which type of RNA is responsible for transporting amino acids during translation?

Possible Answers:

htRNA

rRNA

mRNA

tRNA

Correct answer:

tRNA

Explanation:

tRNA, or transfer RNA, contains two functional regions. One region is the anticodon—a sequence of three nucleotides that corresponds to the coding region of an mRNA molecule. The anticodon-codon sequences define the identity of the amino acid coded for by that particular region of the gene. The second functional region of tRNA is bound to the amino acid that corresponds to the particular anticodon-codon sequence. tRNA will transport this amino acid to a ribosome, bind to the codon on the mRNA, and release the amino acid for incorporation into the growing polypeptide.

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