EASY
AS and A Level
IMPORTANT
Earn 100

Look at the structure of a nucleotide given below. By identifying the sugar and the base with labels in each case, draw a nucleotide that could be found only in DNA.

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Important Questions on Nucleic Acids and Protein Synthesis

EASY
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 1

Look at the structure of a nucleotide given below. By identifying the sugar and the base with labels in each case, draw a nucleotide that could be found only in RNA.

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EASY
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 2
Name the bond formed when two amino acids join by condensation.
EASY
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 2
Name the bond formed when two sugars join by condensation.
MEDIUM
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 3

The evidence used by Watson and Crick in building a model of DNA included data from an American chemist, Erwin Chargaff. Some relevant data are shown in the given table. What is a simple pattern in the base ratios?

Source of DNA Adenine % Guanine % Thymine % Cytosine %
Human (mammal) 30.9 19.9 29.4 19.8
Chicken (bird) 28.8 20.5 29.2 21.5
Salmon (fish) 29.7 20.8 29.1 20.4
Locust (insect) 29.3 20.5 29.3 20.7
Wheat (plant) 27.3 22.7 27.1 22.8
E. coli (bacterium) 24.7 26.0 23.6 25.7
Phage X1 74 (virus) 24.6 24.1 32.7 18.5
EASY
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 4
Make a list of different molecules needed for DNA replication to take place.
MEDIUM
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 4
State what each of different molecules needed for DNA replication does.
EASY
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 4
In what part of a eukaryotic cell does DNA replication take place?
MEDIUM
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 6 - Nucleic Acids and Protein Synthesis>Question>Q 5

In the given image of a DNA molecule, one strand is red and another is blue. Using the colours red and blue as appropriate, draw the two daughter molecules resulting from replication of this molecule if replication is semiconservative.

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