AQA A Level · Biology 7402

DNA, genes and chromosomes: Practice Questions

5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on DNA, genes and chromosomes.

8 questions22 marksFree, no account

Question 1

1 mark

A specific segment of DNA in a eukaryotic cell contains several introns and exons. Which of the following statements correctly describes the arrangement and function of these regions?

Question 2

1 mark

The structure of DNA differs significantly between different locations within a eukaryotic cell. Which of the following correctly describes the DNA found in the mitochondria of a human cell?

Question 3

1 mark

Compare the DNA found in prokaryotic cells with the nuclear DNA of eukaryotic cells. Which of the following is a correct distinction?

Question 4

1 mark

Which of the following statements correctly distinguishes between the DNA found in the nucleus of a eukaryotic cell and the DNA found in a prokaryotic cell?

Question 5

1 mark

Which of the following best describes the difference between DNA in a prokaryotic cell and the nuclear DNA in a eukaryotic cell?

Question 6

5 marks

In eukaryotes, much of the nuclear DNA consists of non-coding sequences. Distinguish between introns and non-coding multiple repeats found between genes.

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Question 7

6 marks

In eukaryotic DNA, distinguish between the structural arrangement of exons and introns within a gene and explain why only one of these is represented in the mature proteome.

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Question 8

6 marks

DNA molecules vary in structure depending on the type of cell in which they are found.

a) Contrast the structure of DNA in a prokaryotic cell with the DNA in the nucleus of a eukaryotic cell. (3 points)
b) Mitochondria also contain DNA. Describe how the DNA in a mitochondrion is similar to the DNA found in prokaryotic cells. (2 points)
c) Define the term locus in the context of a chromosome. (1 point)

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