How many strands is a normal DNA molecule composed of?

• 1

• 2

• 3

• 4

Which base does the DNA base A normally pair up with?

• base C

• base G

• base T

40% of the bases in a DNA molecule are C. What % of the bases are A?

• 10%

• 20%

• 40%

• 80%

20% of the bases in a DNA molecule are G. What % of the bases are T?

• 10%

• 20%

• 30%

• 40%

The diagram shows a DNA molecule. Which of the circled bases form a complementary base pair?

• A and T

• C and G

• C and C

What does DNA carry genetic information for?

• bases

• to make mRNA

• to make amino acids

• to make proteins

The table below shows part of the genetic code. The first three amino acids in a protein are M, Q and Y. What sequence of DNA bases would code for this?

• ATGCAATAC

• ATGGTTTAC

• TACGTTATG

Which substance can be present in the nucleus and at the ribosomes of cells?

• DNA

• Free amino acids

• mRNA

• chromosomes

Between which two structures in animal, fungal and plant cells is mRNA transferred?

• Cell membrane to nucleus

• Nucleus to ribosomes

• Ribosomes to cell membrane

• Cell membrane to ribosomes

In which cell structure are proteins assembled?

• Cell membrane

• Nucleus

• Ribosomes

• Mitochondria