The coded material that migrates from a cell nucleus to a ribosome where a particular polypeptide will be synthesised is known as ...

messenger RNA.

ribosomal RNA.

transfer RNA.

cytoplasm.

Question 1

Translation of a mRNA molecule with 48 nucleotides produces a polypeptide of ...

16 amino acids.

6 amino acids.

Question 2

3 amino acids.

12 amino acids.

A gene mutation in codon 4 in a series of 20 codons would result in a polypeptide ...

Question 3

with a wrong amino acid in the fourth position.

of 3 amino acids.

of 19 amino acids.

of 3 amino acids and another polypeptide of 16 amino acids.

The least number of different t-RNA molecules a living cell must contain, is ...

Question 4

20

48

16

9

Nucleic acids consist of hydrogen bonded ...

Question 5

nucleotides.

deoxyribose.

amino acids.

phosphate ions and ribose.

A fragment of DNA has 120 nitrogen bases; 42 of these bases are thymine. Determine the percentage of cytosine in this fragment.

Question 6

65

36

15

18

Diagram 1 below represents part of a strand of a DNA molecule.

Which of the diagrams 2, 3, 4 or 5 forms a complimentary part to diagram 1 during the replication of the DNA molecule?

Question 7

3

2

4

5

DNA and RNA are similar in that both molecules contain ...

Question 8

adenine.

ribose.

deoxyribose.

uracil.

If the order of nitrogen bases in a part of DNA are as shown below, what is the order of bases on the complimentary strand?

             adenine        guanine        adenine        cytosine

Question 9

thymine     cytosine     thymine     guanine

adenine     guanine     adenine     cytosine

cytosine     adenine     guanine     adenine

thymine     cytosine     thymine     uracil

Which of the following combinations of bases are represented by X in the DNA molecule alongside?

Question 10

G  A  C

G  T  C

A  G  C

C  A  G

In the DNA molecule the only possible base pair is ...

Question 11

thymine and adenine.

thymine and guanine.

guanine and adenine.

cytosine and thymine.

Replication of chromosomes occurs during ...

Question 12

interphase.

crossing over.

anaphase of mitosis.

fertilisation.

Which one of the following is not a difference between meiosis and mitosis?

Question 13

DNA replication.

Chiasmata formation.

Nucleus divides twice.

Reduction division.

The stage when the nucleus is not in the process of dividing is ...

Question 14

interphase.

telophase.

prophase.

metaphase.

The structure of the DNA molecule was determined from an X-ray taken by …

Question 15

Rosalind Franklin

James Watson

Francis Crick

Maurice Wilkins

Set 2

Set 1

This is a learning exercise.

You must scroll to the top and examine your incorrect choices, with the view to improving your understanding of this topic. Refer to the Study Guide if necessary.

Set 2

Set 1

Choose

Questions source: DBE  (Authorisation 11798)

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