How is complementary base pairing restricted? A. One complementary set of bases creates two hydrogen bonds...

How is complementary base pairing restricted?

A. One complementary set of bases creates two hydrogen bonds and the other set form 3 hydrogen bonds

B. the two bonded pyrimidines are too small to cover the space in the double helix of DNA

C. the two purines that are bonded are too big to fit in double helix

D. all of the above

What happens when the translocation of a tRNA from one ribosome binding site to another?

A. tRNA and initiation factors interacy

B. Ribosome shifts 3 nucleotides down mRNA

C.release factor binds to ribosome

D. ribosomal unit dissociates

Expert Solution

Answer 1: correct option is D.

One complementary set of bases creates two hydrogen bonds and the other set form 3 hydrogen bonds. There is complementary base pairing in DNA where adenine always bind to thymine with two hydrogen bonds and guanine always binds with cytosine by three hydrogen bonds.This helps to hold the two antiparallel strands of the DNA molecule together to form the double helix.

The two bonded pyrimidines are too small to cover the space in the double helix of DNA and two purines that are bonded are too big to fit in double helix. So a specific purine binds to a specific pyrimidine.

So correct option is D. All of the above statements are correct.

Answer 2: When the translocation of a tRNA from one ribosome binding site to another,Ribosome shifts 3 nucleotides down mRNA, brings in a charged tRNA at empty A site, translocating the peptidyl tRNA from the A site to the P site and ejecting the uncharged tRNA from P site to E site.

So correct option is (B).

All other other options are not correct according to the given explanation.

gladiator answered 6 months ago

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