AS Level Biology Multiple Choice Questions

A cell is shown in the micrograph. Which statement explains how it is possible to identify the type of microscope used to produce the micrograph?

• The nucleus is visible, so an electron microscope was used.

• The endoplasmic reticulum is not visible, so a light microscope was used.

• Chloroplasts are visible, so a light microscope was used.

• Ribosomes are visible, so an electron microscope was used.

What is bond X?

• covalent bond

• disulfide bond

• hydrogen bond

• peptide bond

Which feature of glycogen distinguishes it from starch?

• All glycogen molecules are highly branched.

• All glycogen molecules are polysaccharides.

• All glycogen molecules contain α-glucose.

• All glycogen molecules contain 1,4-glycosidic bonds.

Which molecules would be produced if this biological molecule was hydrolysed?

• amino acids and glycerol only

• amino acids, glycerol and water

• fatty acids and glycerol only

• fatty acids, glycerol and water

Chickens have 78 chromosomes in the nucleus of a body cell.

How many DNA molecules are there in a chicken body cell at the start of prophase of mitosis?

• 46

• 78

• 92

• 156

Which cells need to transcribe telomerase enzyme?

1 stem cells

2 activated memory B-lymphocytes

3 helper T-lymphocytes secreting cytokines

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Which tRNA anticodons are needed for the synthesis of this polypeptide?

• CCC GAA TTT CAA

• CCC GAA UUU CAA

• GGG CUU AAA GUU

• GGG CUU UUU GUU

The diagram shows a section of a strand of DNA.

Which type of bond is labelled X?

• glycosidic

• hydrogen

• peptide

• phosphodiester

Which row correctly describes cytosine?

• A

• B

• C

• D

During the production of protein molecules, only one strand from the DNA double helix is used. Which name is given to the DNA strand that is used to produce a new protein?

• non-transcribed strand

• leading strand

• template strand

• lagging strand