mark scheme question (1/2 marks)

Question 1

name type of ribosome found in bacteria

Answer 1

70s

Question 2

explain how the ultrasound of a bacterium capsule prevents dehydration

Answer 2

bacterium capsules are made of polysaccharides

which are hydrophilic

Question 3

name 2 myofilaments found in skeletal muscle fibre that gives it its striated appearance

Answer 3

actin

myosin

Question 4

2 ways structure of the plant root hair cell supports the absorption of water and ions from the soil

Answer 4

no chloroplast more room to absorb water

a lot of mitochondria gives energy allow for active transport

permeable cell membrane allow materials to diffuse through

Question 5

explain why root hair cells do not contain chloroplast

Answer 5

found in the ground, no sunlight in soil

so photosynthesis can not take place

Question 6

one structural difference between er and smooth er

Answer 6

rough er contains ribosomes

Question 7

give 2 functions of rough er

Answer 7

transports proteins

protein synthesis , forms vesicles

Question 8

what is an organ

Answer 8

part of an organ system carry out specific function, a group of specialised tissues that form together to make an organ

Question 9

explain how goblet cells protect the lungs

Answer 9

secrete mucus, traps pathogens

keeps lungs moist

Question 10

explain why an egg cell contains large amounts of mitochondria

Answer 10

produces ATP during respiration

for cell division growth, protein synthesis, dan replication