Question

How do the unusual bases of the loops in tRNAinfluence tRNA structure?

a. They disrupt hydrophobic interactions inthe loop regions causing the loops to form.

b. They bind to proteins that hold the loopsopen.

c. They disrupt H bond formation which causescomplementary pairing in the stem regions.

d. They prevent van der Waals interactionswhich prevents loop formation.

e. They disrupt H bond formation in the loopregions causing the loops to form

The greatest variability among codonsspecifying the same amino acid occur _________.

a. in the middle nucleotide of the triplet

b. in the first and third nucleotides of thetriplet

c. in the first two nucleotides of thetriplet

d. in the third nucleotide of the triplet

e. in the last two nucleotides of thetriplet

The initiator tRNA enters the 30S ribosomalsubunit at the ____ during prokaryotic protein synthesis.

a. A site

b. E site

c. Q site

d. P site

e. 50S attachment point

All three major types of RNA (mRNA, tRNA andrRNA) are processed before they are mature. They are

derived from precursor RNA molecules that areconsiderably longer than the final RNA product. These

precursor RNAs are called _________.

a. a and b

b. pre-RNAs

c. primary transcripts

d- predominances

e. prions