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Homework 6.1
Nucleic acids and protein synthesis
This worksheet relates to the structure of nucleic acids and the genetic code. Answering these
questions will help to consolidate your knowledge and understanding of the structure of nucleic acids
and some of the terms used.
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a
Describe the structure of a nucleotide and explain the differences between the structure
of a nucleotide found in RNA and a nucleotide found in DNA.
[5]
b Name the two purine bases found in DNA.
c
[2]
ATP (adenosine triphosphate) is an example of a phosphorylated nucleotide. Outline the
structure of ATP.
[3]
d Explain what is meant by each of the following terms.
i
e
gene
[2]
ii transcription
[2]
iii translation
[3]
The diagram below shows the sequence of bases in part of one DNA strand.
C G T A T
G G A C T
Write down the sequence of bases in each of the following.
i
f
a complementary strand of DNA
[1]
ii a complementary strand of mRNA.
[1]
Analysis of a sample of DNA showed that it contained 18% adenine.
Calculate the percentage of guanine present in this sample.
[2]
[Total: 21]
Cambridge International AS and A Level Biology © Cambridge University Press 2014
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