1 b Variety of living organisms

Question 1

Which substance makes up the yeast cell wall
a. cellulose
b. chitin
c. glycogen
d. starch

Answer 1

b. Chitin

Question 2

Which would be found in yeast cell would aslo be in prokaryotic cells
a. Cell membrane
b. Mitochondion
c. Nucleus
d. Vacuole

Answer 2

a. Cell mebrane

Question 3

How do fungi get their nutrients

Answer 3

Saprotrophic nutrition
keep their enzymes out of their cells
The cells absorb products from their environment

Question 4

What kind of organism is the Plasmodium

Answer 4

Protoctist

Question 5

Suggest what symptoms a person with malaria might have, if they have reduced haemoglobin in their blood

Answer 5

Tiredness
Carry out less respiration
Less energy for the cell to use

Question 6

Explain how human gut bacteria get their nutrition

Answer 6

They keep their enzymes outside
These enzymes digest nutrients from the human food
Bacteria absorb the digested nutrients into the cell

Question 6

State how the presence of gut flora demonstrates that not all bacteria are pathogens

Answer 6

Pathogens cause disease
Gut flora bacteria dont cause disease
Help with digestion

Question 7

Name 2 features common for viruses

Answer 7

Genetic material
Protein coat

Question 8

Why is it necessary for viruses to have differences in their structure

Answer 8

They infect different types of organisms
Different adaptations to their host
Have different spreading mechanisms
Adaptations to overcome the hosts immune system

Question 9

List 3 other ways pathogens can spread between people

Answer 9

Insects
Contaminated food
Contaminated water
Touch
In the air