DNA and the production of proteins test questions

1

How many strands is a normal DNA molecule composed of?

2

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

Base C

Base G

Base T

3

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

20%

30%

40%

4

The diagram shows a DNA molecule.

A DNA molecule, 3 pairs of bases are circled. C and G (both on strand 1), C and C (both on strand 2), and A (strand 1) and T (strand 2).

Which of the circled bases form a complementary base pair?

A and T

C and G

C and C

5

What does DNA carry genetic information for?

Bases

To make amino acids

To make proteins

6

The table below shows part of the genetic code.

DNA base sequence	Amino acid coded for
CTT	E
GTG	H
TAC	M
GTT	Q
CAA	V
ATG	Y

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

7

The table below shows part of the genetic code.

DNA base sequence	Amino acid coded for
CTT	E
GTG	H
GAA	L
TAC	M
GTT	Q
CAC	V
ATG	Y

What would be the sequence of amino acids coded for by the DNA base sequence TACCTTGTG?

HEM

MEH

YLV

8

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

DNA

Free amino acids

mRNA

9

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

Cell membrane to nucleus

Nucleus to ribosomes

Ribosomes to cell membrane

10

In which cell structure are proteins assembled?

Cell membrane

Nucleus

Ribosome