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Quick Biochemistry - Nucleic Acids (Section 13)

1
Within the 'lac operon' model, which element is a protein?
Answer
(B)
Repressor
2
What does the term 'degeneracy of the genetic code' refer to?
Answer
(B)
Codons consisting of only two bases
3
What is the typical role of restriction endonucleases?
Answer
(D)
Protect bacteria from foreign DNA
4
How does prokaryotic mRNA typically differ from eukaryotic mRNA?
Answer
(A)
Having 7-methyl guanosine triphosphate at the 5' end
5
Which co-factor is essential for DNA ligase in E. coli?
Answer
(B)
NAD+
6
Which gene is transcribed during repression?
Answer
(C)
Regulator gene
7
An mRNA molecule is a complementary copy of which DNA strand?
Answer
(B)
3'-5' strand of DNA
8
What factor signals the termination of RNA molecule synthesis?
Answer
(D)
ρ
9
Which antibiotic hinders the binding of prokaryotic DNA-dependent RNA polymerase to gene promoter sites?
Answer
(B)
Rifamcin
10
In E. coli, which amino acid starts protein synthesis?
Answer
(A)
N-formyl methionine
11
What process does the mushroom toxin Amanitin disrupt?
Answer
(D)
mRNA production
12
During protein synthesis, how many high-energy phosphate bonds are needed for amino acid activation?
Answer
(B)
Two
13
What molecule is produced as a result of the translation process?
Answer
(D)
A protein molecule
14
Which of the following is NOT involved in peptide chain elongation?
Answer
(C)
Formyl-Met-tRNA
15
What is the function of the 'rho' (ρ) factor?
Answer
(C)
In termination of transcription
16
What energy-carrying molecule does ligase require during the synthesis of c-DNA?
Answer
(B)
ATP
17
Which molecule attaches to specific nucleotide sequences far from the starting point?
Answer
(A)
RNA polymerase
18
Which sequence is complementary to TGGCAGCCT?
Answer
(A)
ACCGTCGGA
19
In what location are ribosomes, similar to those found in bacteria, located?
Answer
(A)
Plant nuclei
20
How do DNA and RNA synthesis NOT share similar mechanisms?
Answer
(D)
They require a primer
21
Which process does NOT involve template-directed DNA synthesis?
Answer
(C)
Growth of RNA tumor viruses