unit 1 past paper questions

Question 1

Which of the following statements is true for proteins?
1. They are made in the nucleus.
2. They are affected by temperature.
3. They can be found in the cell membrane.
4. They all function as enzymes.
A 2 and 3 only
B 2 and 4 only
C 1, 3 and 4 only
D 2, 3 and 4 only

Answer 1

A

Question 2

A sample of 350 bacterial cells were modified to produce a human protein.
Only 210 of these cells successfully produced the protein.
The percentage success was
A 60%
B 67%
C 140%
D 167%

Answer 2

A

Question 3

Fermentation in yeast cells occurs in the
A cytoplasm
B mitochondria
C plasmids
D ribosomes.

Answer 3

A

Question 4

An earthworm with a mass of 7 g uses up 3.5 cm3
of oxygen in 25 minutes.
Calculate the volume of oxygen used by this earthworm in 1 minute.
A 0.02 cm3
B 0.14 cm3
C 0.5 cm3
D 1.02 cm3

Answer 4

B

Question 5

A role of stem cells in the human body is to produce
A antibodies for defence
B new skin tissue to repair a cut
C enzymes for digestion
D hormones for communication.

Answer 5

B

Question 6

Hormones are
A electrical messengers that travel along neurons
B chemical messengers that travel along neurons
C electrical messengers that travel in the bloodstream
D chemical messengers that travel in the bloodstream.

Answer 6

D

Question 7

Name the material that plant cell walls are made of

Answer 7

Cellulose

Question 8

Apart from the difference in size give one other difference between a bacterial and plant cell

Answer 8

Bacterial cells have no nucleus/
mitochondria/vacuole/chloroplasts
and plant cells do

Question 9

When water enters a plant cell the vacuole fills and swells until no more water can enter what is the term used to describe a plant cell in this state

Answer 9

Turgid

Question 10

Name the type o molecule that proteins are made from

Answer 10

amino acids

Question 11

Describe the feature of pepsin that allows it to bind to only one substrate

Answer 11

The active site of pepsin is complementary to the substrate

Question 12

Name the type of respiration that yields the most ATP per glucose molecule

Answer 12

Aerobic

Question 13

State why muscle cells require more mitochondria than skin cells

Answer 13

Muscle cells require more ATP than skin cells

Question 14

The following statements relate to the transport of molecules across membranes:
1. Energy is required.
2. Molecules move from an area of high concentration to an area of low concentration.
3. Membrane proteins are involved.
Which of the statements apply to active transport?
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3

Answer 14

B

Question 15

Where in a cell would mRNA not be found?
A Cell membrane
B Cytoplasm
C Nucleus
D Ribosome

Answer 15

A

Question 16

The following statements relate to cellular processes:
1. Completed in the mitochondria.
2. Affected by temperature.
3. Release oxygen.
Which of the statements are correct for aerobic respiration?
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3

Answer 16

A

Question 17

escribe the difference that would be found in the ultrastructure of plant cells
that do not carry out photosynthesis.

Answer 17

They would not contain any chloroplasts

Question 18

Give the term used to describe the structure of a DNA molecule

Answer 18

Double stranded helix

Question 19

Name the type of molecule coded for by a section of DNA

Answer 19

Protein

Question 20

Animal cells left in a solution with a lower water concentration than their contents
A shrink
B burst
C become turgid
D become plasmolysed.

Answer 20

A

Question 21

Which of the following reactions takes place during fermentation in plant cells?
A pyruvate - carbon dioxide + ethanol
B glucose - carbon dioxide + water
C glucose - water + ethanol
D pyruvate - lactate

Answer 21

A

Question 22

Hormones are released by
A endocrine glands
B blood cells
C receptor cells
D target tissues

Answer 22

A

Question 23

Describe the function of the cell membrane.

Answer 23

Controls what molecules enter and leave the cell

Question 24

Enzymes can be involved in two types of reaction. The extraction of juice
from apple pulp is an example of a degradation reaction.
Name the other type of reaction.

Answer 24

Synthesis

Question 25

Cellulase is an enzyme that speeds up the breakdown of a component of
the plant cell wall.
Name this component

Answer 25

Cellulose

Question 26

What name is given to the substance that an enzyme breaks down?

Answer 26

Substrate

Question 27

Name the substance that must be present for yeast to respire aerobically

Answer 27

Oxygen

Question 28

Glucose molecules in low concentration in the kidney have to be moved into the
bloodstream, where there is a higher concentration of glucose.
The process responsible for this action is
A osmosis
B diffusion
C passive transport
D active transport.

Answer 28

D

Question 29

Which of the following represents the sequence of events in the production of a protein
from the genetic code?
A DNA - amino acids - mRNA - protein
B DNA - mRNA - amino acids - protein
C mRNA - DNA - amino acids - protein
D amino acids - DNA - mRNA - protein

Answer 29

B

Question 30

Which of the following are all types of proteins?
A Hormones, enzymes and nitrates
B Antibodies, enzymes and plasmids
C Hormones, receptors and antibodies
D Receptors, antibodies and nitrates

Answer 30

C

Question 31

Explain why osmosis is described as a passive transport

Answer 31

Does not require energy

Question 32

Describe the way in which the DNA strands are linked together

Answer 32

Complementary base pairing

Question 33

Name the organelle in animal cells which stores the DNA

Answer 33

Nucleus

Question 34

Name a cellular process which requires energy from ATP.

Answer 34

Muscle contraction/cell division/protein
synthesis/transmission of nerve
impulses/active transport.

Question 35

Describe how enzymes are involved in th genetic modification process

Answer 35

To extract required gene from chormosome

Question 36

Name the type of molecule coded for by a secton of DNA

Answer 36

protein