Combined Science GCSE

Question 1

Eukaryotes

Answer 1

animal and plants cell which contain their genetic material enclosed within a nucleus

Question 2

Prokaryotes

Answer 2

bacterial cells which their genetic material is not enclosed within a nucleus and they are much smaller than eukaryotes

Question 3

Centi

Answer 3

1 centimetre is 1/100th of a metre

Question 4

Milli

Answer 4

1 millimetre is 1/1000th of a metre

Question 5

Micro

Answer 5

1 micrometre is 1/1000000th of a metre

Question 6

Nano

Answer 6

1 nanometre is 1/1000000000th of a metre

Question 7

Order of Magnitude

Answer 7

every order of magnitude is 10x greater than the one before

Question 8

One order of magnitude

Answer 8

10x - one zero

Question 9

Two orders of magnitude

Answer 9

100x - two zeros

Question 10

Three orders of magnitude

Answer 10

1000x - three zeros

Question 11

Nucleus

Answer 11

to enclose the genetic material

Question 12

Cytoplasm

Answer 12

watery solution where chemical reactions take place

Question 13

Cell Membrane

Answer 13

controls the molecules that can enter and leave the cell

Question 14

Mitochondria

Answer 14

where aerobic respiration takes place

Question 15

Ribosomes

Answer 15

sites of protein synthesis

Question 16

Chloroplasts

Answer 16

contain chlorophyll and the sites of photosynthesis

Question 17

Cell Wall

Answer 17

made of cellulose which strengthens the cell

Question 18

Vacuole

Answer 18

filled with cell sap and helps to give the plant cell its shape

Question 19

Sperm cell

Answer 19

to join with an egg cell, process called fertilisation

Question 20

Sperm tail

Answer 20

allows to swim towards the egg

Question 21

Mitochondria in Sperm

Answer 21

provides energy needed for swimming

Question 22

Enzymes in Sperm

Answer 22

allow the sperm to digest its way through the outer layer of the egg

Question 23

Nerve Cell

Answer 23

send electrical impulses around the body

Question 24

Axon

Answer 24

carries the electrical impulses from one part of the body to another

Question 25

Myelin

Answer 25

insulates the axon and speeds up the transmission of the nerve impulses

Question 26

Synapses

Answer 26

allows the impulse to pass from one nerve cell to another

Question 27

Dendrites

Answer 27

increase the surface area so that other nerve cells can connect more easily

Question 28

Muscle cells

Answer 28

contract and contain protein fibres which can change their length

Question 29

Root hair cell

Answer 29

have hairs that increase the surface area of the root so it can absorb water and dissolved minerals more effectively