B3 + B4

Question 1

how can bacteria make us feel ill

Answer 1

they produce toxins that damage your cells and tissues

Question 2

how does tobacco mosaic virus affect a plants growth

Answer 2

it makes there leaves become discoloured which then means they cant carry out photosynthesis which they need to grow

Question 3

how are mosquitos involved with the spread of malaria

Answer 3

they carry malaria and then when they bite you they give it on

Question 4

what are the symptoms of gonorrhoea

Answer 4

pain when they urinate

Question 5

how can destroying vectors help prevent the spread of disease

Answer 5

because you are getting rid of the organisms that spread it

Question 6

what does the stomach produce that can kill pathogens

Answer 6

hydrochloric acid

Question 7

give three ways that white blood cells can defend against pathogens

Answer 7

phagocytosis (engulf and digest)
they can produce antitoxins (they counteracts the toxins)
they can produce antibodies

Question 8

give 1 pro and 1 con of vaccination

Answer 8

they can control lots of communicable disease

you can have bad reactions to them

Question 9

why is it difficult to develop drugs that kill viruses without also damaging body tissues

Answer 9

because viruses use our body cells to reproduce

Question 10

which plant does the pain killer asprin originate from

Answer 10

willow

Question 11

what two things are drugs tested on in preclinical testing

Answer 11

human cells

human tissues

Question 12

what is placebo

Answer 12

a substance like another drug that has been tested and doesn’t do anything

Question 13

where in the plant cell does photosynthesis take place

Answer 13

chloroplasts

Question 14

what is an endothermic reaction

Answer 14

a reaction where energy is transferred FROM the environment

Question 15

what is the word equation for photosynthesis

Answer 15

light

carbon dioxide + water ——–> glucose + oxygen

Question 16

why do some plants store glucose as starch

Answer 16

so it is ready for when photosynthesis isn’t happening (winter when there is no sun)

Question 17

what is meant by ‘limiting factor’ of photosynthesis

Answer 17

the limit of the rate of photosynthesis

Question 18

what effect would low carbon dioxide concentration have on the rate of photosynthesis

Answer 18

the rate of photosynthesis will be less

Question 19

describe how you could measure the effect of light intensity on the rate of photosynthesis

Answer 19

the number off bubbles given off

Question 20

in the inverse square law, how are light intensity and distance linked

Answer 20

the further away the light source is the lower the intensity

Question 21

what is respiration

Answer 21

the process of transferring energy from glucose which goes in every cell

Question 22

what is an exothermic reaction

Answer 22

a reaction where energy is transferred to the environment

Question 23

name the products of aerobic respiration

Answer 23

carbon dioxide + water

Question 24

what is produce by anaerobic respiration in muscle cells

Answer 24

lactic acid

Question 25

what is the word equation for anaerobic respiration in yeast cells

Answer 25

glucose ——> ethanol + carbon dioxide

Question 26

name two products of the food and drink industry that fermentation is needed for

Answer 26

bread

alcohol

Question 27

give 3 things that increase to supply the muscles with more oxygenated blood

Answer 27

heart rate
breathing rate
breathing volume

Question 28

in what organ is lactic acid converted back into glucose

Answer 28

the liver