Mistakes

Question 1

reason of anomalous result

Answer 1

misread value

Question 2

‘lock and key’

Answer 2

active site complimentary, bind, release products

Question 3

test glucose

Answer 3

Benedict, boil, blue > orange

Question 4

reactants in algae photosynthesis

Answer 4

water and carbon dioxide

Question 5

how to prepare cell for microscope

Answer 5

dye, microscope slide

Question 6

why does red blood cell burst, not plant

Answer 6

water enters via diffusion, cell wall prevent bursting

Question 7

examples of aseptic techniques

Answer 7

sterilised surface, open lid at angle

Question 8

three stages mitosis

Answer 8

DNA + organelles replicate, chromosomes separate to opposite poles, nucleus and cytoplasm and cell membrane divides

Question 9

similarities of xylem and phloem

Answer 9

both transport substances throughout body

Question 10

differences of xylem and phloem

Answer 10

xylem have lignin, xylem are dead, xylem carry dissolved water and mineral ions + phloem carries dissolved sugars

Question 11

why is there a higher uptake of water on a hot day rather cold?

Answer 11

more evaporation, more water loss, more water taken up to replace water loss

Question 12

blockage of arteries causes cell to die

Answer 12

less oxygen supply to heart, decreases rate of respiration

Question 13

how do stents work?

Answer 13

open artery, to allow more blood to go through

Question 14

amylase is a polymer of . . .

Answer 14

many amino acids

Question 15

low components of blood effects

Answer 15

low red blood cells = low oxygen = low respiration = low energy and functional organs and lactic acid = muscle fatigue, low white blood cells = decreased pathogens inhibited = higher infections, low platelets = decreased blood clots

Question 16

blocked tube gall bladder small intestine difficulty digesting fat

Answer 16

less bile reaches small intestine = lower fat emulsification = decreased surface area for lipase to break down fat and pH not neutralised = lipase not working at optimum pH

Question 17

why do arteries have a thick muscle wall

Answer 17

to maintain high pressure

Question 18

effects liver cirrhosis

Answer 18

no bile, food not absorbed = loss of weight, lactic acid not broken = accumulates = body poisoned = increase oxygen debt = muscle fatigue, proteins not broken = accumulation of amino acids, no toxin removal = accumulates = pain

Question 19

leaking valve difficult exercise

Answer 19

backflow = reduced blood flow rate from heart = decreased oxygen supply = less respiration = anaerobic = lactic acid = increase oxygen debt + less carbon dioxide removal = muscle fatigue

Question 20

one ventricle less efficient

Answer 20

oxygenated and deoxygenated blood mix, less oxygen to cells

Question 21

why axolotl die water less oxygen concentration

Answer 21

less diffusion of oxygen into cells = less respiration = less energy = lower metabolism

Question 22

pancreatic cancer lose weight

Answer 22

decreased enzyme production = food not broken down = low glucose absorption = less glucose available for respiration = use of stored fat for energy

Question 23

route of oxygenated blood from lungs to cells

Answer 23

blood travels pulmonary vein, to left atrium

Question 24

investigation for pH effect on amylase

Answer 24

range three pH values, keep starch concentration same with same temperate water bath, qualitative observations with iodine, colour changes at different temperatures, repeat