Question

1. During translation elongation, tRNA's charged with amino acids enter the ribosome at which site?

a. a site

b. t site

c. p site

d. e site

e. z site

2. In eukaryotic transcription the enzyme that primarily transcribes heteronuclear RNA (or pre-messenger RNA) is

a. RNA polymerase II

b. RNA polymerase III

c. reverse transcriptase

d. primase

e. RNA polymerase I

Answer 1

1. During translation elongation, t-RNA charged with amino acids enter the ribosome at a) A site

Explain-- At the start of the elongation the anticodon of f-met t-RNA is H2  bounded to the AUG initiation codon in the peptydal(p site) site of the ribosome. The next codon in the m-RNA is the aminoacyl site (A). Next appropriate aminoacyl t-RNA binds to the codon in the A site.

2 .In eukaryotes transcription the enzyme that primarily transcribes heteronuclear RNA (or pre messenger RNA) is a) RNA polymerase II

Explain-- During transcription the DNA of a gene serve as template for complementary base pairing and the enzyme called RNA polymerase II catalyzes the formation of the pre m-RNA molecule which is then processed to form mature m-RNA .