Dna Protein Synthesis Recombinant Dna Test Page 3
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4DNA, Protein Synthesis and Recombinant DNA
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7.
The molecule represented
by the line labelled X is
A. DNA.
B. tRNA.
C. rRNA.
D. mRNA.
8.
Demonstrate your understanding of the structure of DNA by describing the following features
of the DNA molecule. You may use drawings in your answers.
a) Describe the shape of the DNA molecule. (1 mark)
Double helix (twisted ladder)
b) Describe the structure of the strands (backbone) of DNA. (1 mark)
Alternating molecules of phosphate and deoxyribose sugar
c) Describe complementary base pairing. (1 mark)
Cytosine and guanine always bond with each other and adenine and thymine always bond
with each other
d) Describe the bonding that occurs between bases. (1 mark)
Hydrogen bonding
9.
Give one role of each of the following in the process of translation. (3 marks: 1 mark each)
•
tRNA:
•
See #18
Ribosome:
•
mRNA:
10.
The process shown in the diagram
is
A. hydrolysis.
B. translation.
C. replication.
D. transcription.
11.
a) DNA replication involves the breaking of bonds between
A. bases.
B. sugars and bases.
C. phosphates and bases.
D. sugars and phosphates.
b) When a foreign gene is incorporated into an organism’s nucleic acid, the resulting molecule is called
A. ATP.
B. recombinant DNA.
C. transfer RNA (tRNA).
D. messenger RNA (mRNA).
12.
1. Uracil bonds with adenine.
2. Complementary bonding between codon and anticodon.
3. DNA unzips.
4. mRNA joins with ribosome.
The correct order of the above during protein synthesis is
A. 1, 2, 4, 3
B. 1, 3, 2, 4
C. 3, 1, 4, 2
D. 3, 2, 1, 4
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