Dna/rna Genetics Worksheet With Answers (Page 4 of 4) in pdf

Dna/rna Genetics Worksheet With Answers Page 4

a. The carboxyl end of AA #3 should now be covalently bonded directly to

(tRNA #2) (tRNA #3) (tRNA #4) (AA #2) (AA #3)

(AA

#4) (none of these).

It starts out attached to tRNA#3, but is transferred to AA#4 as soon as it arrives.

b. Which tRNA will you find in the A site? (tRNA #1) (tRNA #2) (tRNA #3)

(tRNA

#4) (tRNA #5).

The tRNA in the A site will carry (an amino acid)

polypeptide) (neither)

(either one).

Initially, the tRNA simply carries an amino acid, but then the growing

polypeptide is transferred to the A site before translocation. That peptide bond can

still be formed in the presence of erythromycin.

11. Here is a short stretch of replicating DNA from the bacterium E. coli. The top strand

is the template. Assume the ****** are the RNA primers.

This shows parts of four Okazaki fragments.

3’-------------------------------------------------------------------------------------5’

5’-----********--------------------*********-------------------*******----------------*3’

Which was made first, the Left or the Right fragment?

RIGHT

Which primer will be the first to be removed, Left, Middle, or Right?

RIGHT

When the primer in the middle is removed and filled in with DNA, the fragments must

then be joined.

Which enzyme removes the RNA primer?

DNA polymerase I

Which enzyme joins the fragments?

ligase

Where is the final connection made? (a or b?)

Dna/rna Genetics Worksheet With Answers Page 4