Practice quiz - The genetic code

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Directions: Choose the best answer for each of the following questions. When you are finished, click on the "Ready to be graded" button.

Refer to the above table to answer the following questions.

1. Given the following sequence of mRNA, what series of amino acids are coded for?

mRNA: CUCAAGUGCUUC

Ser - Tyr - Arg - Gly

Val - Asp - Pro - His

Leu - Lys - Cys - Phe

Pro - Glu - Leu - Val

2. For the same mRNA sequence as in question 1, the anticodons for the codons in the mRNA are

GAG - UUC - ACG - AAG

GAG - TTC - ACG - AAG

CUC - GAA - CGU - CUU

CUU - CGU - GAA - CUC

3. Given the following sequence of amino acids, use the genetic code table to determine the DNA sequence that codes for the amino acids.

amino acid sequence: tyrosine - proline - aspartic acid - isoleucine - cysteine

AUGGGUCUAUAUACG

ATGGGTCTATATACG

GCAAACTCGCGCGTA

ATAGGGCTTTAAACA

4. codons : mRNA ::

anticodons : tRNA

triplets : DNA

rRNA : ribosomes

all of the above

5. The codon AUG, which codes for the amino acid methionine, also serves as

a lac operon

a start codon

a stop codon

a promoter

6. The codons UAA, UAG, and UGA all code for

arginine

threonine

phenylalanine

stop codons

7. With the exception of tryptophan, each amino acid is coded for by more than one codon. This is called

translation

reversal

redundancy

sequentialism

8. The fact that the genetic code is almost universal in living organisms is considered to be evidence that all organisms

are evolutionarily related

are genetically identical

have the same sequence of anticodons

none of the above

9. Anticodons are found on

rRNA

mRNA

DNA

tRNA

10. The entire genetic code consists of ____ amino acids and ____ codons.

20, 20

20, 64

30, 60

30, 72

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