1. In the genetic code, the length of a codon is A. 1 base B. 2 bases C. 3 bases

Question

1. In the genetic code, the length of a codon is

A.  1 base

B.  2 bases

C.  3 bases

D.  4 bases

2. The ability of some tRNA's to bind to more than one codon is called

A.  slop

B.  inosine

C.  wobble

D.  fluctuation

3. A synthetic mRNA is composed of 3 parts uracil and 1 part cytosine, this mRNA would code for a protein that contained approximately what proportion of proline (Pro) (genetic code is on page 297 of your textbook)?

A.  27/64

B.  1/64

C.  4/64

D.  3/64

4. During protein synthesis, how many equivalents of ATP are used for each peptide bond?

A.  1

B.  2

C.  3

D.  4

5. During protein synthesis, the peptide chain is synthesized in the

A.  amino to carboxyl direction

B.  carboxyl to amino direction

C.  phosphoryl to hydroxy direction

D.  hydroxy to phosphoryl direction

6. In which of the following groups of organisms could you expect to find polysomes?

A.  grasses

B.  frogs

C.  bacteria

D.  yeast

7. If there were only the bases adenine and thymine, how long would a codon have to be for there to be enough codons to specify 20 amino acids.

A.  3

B.  4

C.  1

D.  5

E.  6

8. The start codon for translation in prokaryotes is

A.  3' - A - U - G - 5'

B.  5' - U - U - A - 3'

C.  5' - A - U - G - 3'

D.  3' - M - E - T - 5'

9. During peptide elongation, the charged tRNA is added at the

A.  P site of the ribosome

B.  A site of the ribosome

C.  active site of the tRNA-aminoacyl synthetase

D.  signal peptidase

10. A mutation that adds or deletes a base pair from DNA is

A.  a frameshift mutation

B.  a nonsense mutation

C.  a missense mutation

D.  an aneuploid condition

Explanation / Answer

1) length of codon is 3 nucleotide basepair which code for 20 amino acids.

3) 27/64 proportion of proline

4) 2 ATP are use for peptide bond formation and 1 ATP for amino acid activation.

5) peptide bond form from amino acid i.e. N Terminal to carboxylic direction i.e. C direction.

6) polysome is a structure of ribosomes attached on mrna and this in found in prokaryotes i.e. Bacteria.

7) there will be 6 nucleotide in a codon

8) 3' AUG 5' since its a start codon

9) A site of ribosomes

10) frameshift mutation

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