MOCKS

Question 1

State why the statement may not be valid.

Answer 1

data from one area
no information about people considered

Question 2

Describe how the mAbs and a fluorescent dye could be used to see any pathogens on the slide.

Answer 2

bind fluorescent dye to mAbs
put bound fluorescent mAbs on the slide
mAbs will bind to pathogens and show up under the microscope

Question 3

Describe how the mAbs and a fluorescent dye could be used to see any pathogens on the slide.

Answer 3

bind fluorescent dye to mAbs
put bound fluorescent mAbs on the slide
mAbs will bind to pathogens and show up under the microscope

Question 4

Explain how phagocytosis will help the patient.

Answer 4

more pathogens engulfed
so less cell damage

Question 5

Uses of mAbs

Answer 5

treat cancer
locate hormones
pregnancy tests

Question 6

Pregnancy test

Answer 6

urine passes through reaction zone
HCG hormone binds to the mobile HCG antibody (in the reaction zone)
(passes up the stick) HCG hormone binds to the immobilised HCG antibodies in the results zone
(the other) antibodies which do not attach to HCG
bind to antibodies in control zone
blue dye appears in both control and results zones (to show positive result)

Question 7

Food tests

Answer 7

starch —> iodine —> orange to blue-black
glucose —> benedict’s solution —> heat in a water bath —> blue to brick-red
protein —> add biurets reagent —> shake —> blue to purple
lipids —> add xcm3 of ethanol —> add equal volume of distilled water —> milky-white emulsion forms if present

Question 8

Why do companies grow bacteria at a higher temperature?

Answer 8

bacteria grow faster

Question 9

placebo

Answer 9

used as control

Question 10

How does the removal of sugar from the plant’s stem cause stunted growth?

Answer 10

less sugar for respiration
so less energy released
or
fewer amino acids made
so less proteins produced
or
less cellulose made
so weaker cell walls

Question 11

Plant defences

Answer 11

cell wall & waxy cuticle - tough / difficult to penetrate
dead cells - fall off, taking pathogens with them

Question 12

cloning in plants

Answer 12

stem cells from meristem
tissue culture

Question 13

identify plant diseases

Answer 13

compare to garden manual
send sample to laboratory

Question 14

Explain why a man’s breathing rate increased whilst he was running.

Answer 14

To increase oxygen intake
to use for respiration (for energy release)

Question 15

effect of smoking

Answer 15

lung cancer

Question 16

Give one measurement that could be taken to show a different effect of
exercise on the body

Answer 16

heart rate/pulse
volume of breathe
volume of sweat
body temperature

Question 17

uses of energy released from respiration

Answer 17

muscle contraction
active transport
keeping warm
building larger molecules

Question 18

Pond weed experiment

Answer 18

place a lamp down at 0cm on the measuring stick
then place a boiling tube with sodium hydrogen carbonate at 10cm
then place pondweed into a boiling tube with the end cut
leave for 5 minutes to acclimatise
start a stopwatch for 1 minute then count the number of bubbles produced (this is oxygen)
record this amount and repeat to calculate a mean
then repeat this whole experiment at 20cm, 30cm, 40cm etc

Question 19

Problems

Answer 19

not all bubbles the same size
number of bubbles can be too fast to count accurately

Question 20

solution

Answer 20

place funnel and measuring cylinder to count bubbles

Question 21

How does the death of the snail cause co2 concentration to increase

Answer 21

snail being decayed
by decomposers
therefore respiration of decomposers releases CO2

Question 22

Why does heart rate increase during exercise?

Answer 22

to increase blood flowing to muscles
so oxygen
to provide more oxygen (to muscles)
to provide more glucose (to muscles)
to remove carbon dioxide and lactic acid more quickly

Question 23

Why does breathing rate increase during exercise?

Answer 23

more oxygen to lungs
more oxygen to blood

Question 24

Why is there more oxygen to muscles during exercise?

Answer 24

needed for (increased) respiration
○ to release / provide energy
○ for muscle contraction

Question 25

Why does anaerobic respiration occur during exercise?

Answer 25

due to lack of oxygen
which causes a build-up of lactic acid
causes muscle fatigue and pain