HARD
AS and A Level
IMPORTANT
Earn 100

Complete the table to distinguish between the processes of transcription and translation.

  Transcription Translation
Site in a cell where it occurs    
The molecule used as a template    
Molecule produced    
Component molecules 
(monomers) of molecule 
produced		    
One other molecule that is essential for the process to occur    

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>BEFORE YOU START>Q •
Where is DNA found in cells?
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>BEFORE YOU START>Q •
Why is DNA sometimes called 'the molecule of life'?
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>BEFORE YOU START>Q •
How would you justify the statement that the discovery of the structure of DNA is one of the most important discoveries ever made by humans?
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 DNA.

Question Image

 

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.

Question Image

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