science biology - paper 1

Question 1

eukaryotic and prokaryotic?

Answer 1

eukaryotic-complete ones (animal & plant )
prokaryotic- smaller & simple (bacterial)

Question 2

what is in an animal cell?

Answer 2

nucleus
ribosomes
cytoplasm
cell membrane
mitochondria

Question 3

plant cell?

Answer 3

nucleus
vacuole
cell membrane
ribosomes
chloroplasts
cytoplasm
mitochondria
cel wall

Question 4

bacterial cell?

Answer 4

cell membrane
cytoplasm
plasmid
strand of DNA
cell wall

Question 5

how many chromosomes does a nucleus contain?

Answer 5

23 pairs (46) in total

Question 6

what is mitosis

Answer 6

type of cell division, important for growth & development

Question 7

enzymes?

Answer 7

proteins and work using a lock & key fit.

Question 8

plasma

Answer 8

liquid which carries eberything in the blood

Question 9

risk factors for disease

Answer 9

poor diet/ lack of exercise
alcahol
obesity
smoking
carcinogens

Question 10

photosynthesis

Answer 10

carbon dioxide + water -> light -> glucose + oxygen
happens in the chloroplast inside cells in leaves
contains cholorphyll
light is absorbed
endothermic reaction
glucose used for respiration.

Question 11

aerobic respiration?

Answer 11

oxygen is supplied
during excercise heart, breathing and blood rate all increase
more oxygenated blood

Question 12

anaerobic respiration

Answer 12

happens in muscles when there’s insufficient oxygen
muscles become tired
builds up lactic acid creating oxygen debt