B2

Question 1

what is tissue

Answer 1

a group of specialised cells

Question 2

what is meant by the term organ system

Answer 2

a group of organs that work together to do a specific job

Question 3

why can enzymes be described as biological catalysts

Answer 3

because enzymes reduce the need for high temperature but speed up the reaction at the same time

Question 4

what does it mean when an enzyme has been denatured

Answer 4

it has lots its natural form (due to a drastic change in PH )

Question 5

why do enzymes only usually catalyse one reaction

Answer 5

because the active site is specific to one molecule

Question 6

describe how you can investigate the effect of PH on the rate of amylase activity

Answer 6

measure the time taken for the amylase to completely break down the starch, and keep changing the PH to see whichever one is quickest

Question 7

list 3 places where amylase is made in the human body

Answer 7

pancreas
salivary glands
small intestine

Question 8

what is the role of lipase

Answer 8

to break down fats/lipids

Question 9

where is bile stored

Answer 9

gall bladder

Question 10

name the solution that you would use to test for the presence of lipids in a food sample

Answer 10

Sudan 3 solution

Question 11

names the tubes that split off the trachea

Answer 11

bronchi

Question 12

name the role that alveoli play in gas exchange

Answer 12

diffusion

Question 13

explain why the human circulatory system is described as ‘double circulatory system’

Answer 13

blood passes through the heart twice per circuit

Question 14

why does the heart have valves

Answer 14

to prevent backflow

Question 15

name the four chambers of the heart

Answer 15

left ventricle
right ventricle
left atrium
right atrium

Question 16

how is the heart resting rate controlled in a healthy heart

Answer 16

autonomic nervous system

Question 17

how are arteries adapted to carry blood away from the heart

Answer 17

thick walls

Question 18

why do red blood cells not have a nucleus

Answer 18

to make more space for oxygen

Question 19

2 advantages and 2 disadvantages of statins

Answer 19

reduce the amount of bad cholesterol
prevent some disease

they are long term
negative side affects

Question 20

what is the difference between biological and mechanical replacement heart valves

Answer 20

mechanical are more durable and last longer

biological are made from animal tissues or human donner tissues

Question 21

what is meant by non-communicable disease

Answer 21

the disease cant be spread

Question 22

what is meant by risk factor of disease

Answer 22

things that are to do with the increase of likelihood that a person will develop a certain disease

Question 23

which type of tumour is cancerous

Answer 23

malignant

Question 24

list the tissues that make up a leaf

Answer 24

epidermal 
palisade mesophyll
spongy mesophyll
xylem
phloem
meristem

Question 25

what is the function of the phloem

Answer 25

to transport food

Question 26

what is transpiration

Answer 26

the loss of water from a plant

Question 27

list the four main thigs that affect transpiration

Answer 27

light intensity
temperature
air flow
humidity

Question 28

how could you measure the rate of transpiration

Answer 28

you could use a potometer