Biology- Topic 8

Question 1

What does the neurone do from -70mV to +35mV?

Answer 1

Depolarise

Question 2

What does the neurone do from +35mV to -70mV?

Answer 2

Repolarise

Question 3

Description of the Cerebrum

Answer 3

Separated into 2 hemispheres

Connected by corpus callosum

Question 4

Description of the cerebral cortex

Answer 4

Outer layer of cerebrum
2-3mm, large SA
Allows learning
Known as grey matter

Question 5

Frontal lobe

Answer 5

Left front is where Brocas area is (language)

Personality, critical thinking

Question 6

Cause of Parkinsons

Answer 6

Dopamine neurotransmitter decrease

Neurones breakdown in Basal ganglia

Question 7

Cause of depression

Answer 7

Serotonin neurotransmitter decrease

Question 8

Ethical issues around HGP

Answer 8

Two tiered health service, only wealthy can afford
Discrimination by life insurance and other companies
Revealing drug is less effective may be psychologically damaging

Question 9

Enzymes involved in genetic modification

Answer 9

Restriction- isolate useful genes
create sticky ends
Ligase enzymes to insert gene into plasmid
Ligase forms phosphodiester bonds between nucleotides

Question 10

What is a stimulus?

Answer 10

A detectable change in the internal or external environment. Leading to a response

Question 11

Why do plants and animals respond to stimuli?

Answer 11

To avoid harmful changes. To maintain an optimal internal environment. For metabolic reactions. For survival