quiz 8

Question 1

Choose the TRUE statement re: the absolute refractory period.
Question 1 Answer

a.
The absolute refractory period is due to the hyperpolarization of the cell - it occurs after the relative refractory period

b.
The absolute refractory period is due to the hyperpolarization of the cell - it occurs before the before the relative refractory period

c.
The absolute refractory period is due to closure of the inactivation gate - it occurs before the relative refractory period.

d.
The absolute refractory period is due to closure of the inactivation gate - it occurs after the relative refractory period.

Answer 1

c.
The absolute refractory period is due to closure of the inactivation gate - it occurs before the relative refractory period.

Question 2

Which fibre type is most likely to conduct action potentials the fastest?
Question 2 Answer

a.
B fibres

b.
D fibres

c.
C fibres

d.
A fibres

Answer 2

d.
A fibres

Question 3

Choose the TRUE statement re: the relative refractory period.
Question 3 Answer

a.
The relative refractory period is due to the hyperpolarization of the cell - it occurs before the absolute refractory period

b.
The relative refractory period is due to closure of the inactivation gate - it occurs before the absolute refractory period.

c.
The relative refractory period is due to the hyperpolarization of the cell - it occurs after the absolute refractory period

d.
The relative refractory period is due to closure of the inactivation gate - it occurs after the absolute refractory period.

Answer 3

c.
The relative refractory period is due to the hyperpolarization of the cell - it occurs after the absolute refractory period

Question 4

Which of the following is true of the function of t-SNAREs?
Question 4 Answer

a.
t-SNARES bind to calcium and cause binding of complexin

b.
t-SNARES are attached to the pre-synaptic membrane - they attach to v-SNARES

c.
t-SNARES load the synaptic vesicle with neurotransmitter

d.
t-SNAREs are attached to vesicles - they bind to v-SNARES

Answer 4

b.
t-SNARES are attached to the pre-synaptic membrane - they attach to v-SNARES

Question 5

Where do action potentials occur in a neuron?
Question 5 Answer

a.
Where the axon attaches to the cell body (the axon hillock)

b.
The dendritic spine

c.
The cell body

d.
Where the dendrite attaches to the cell body (the dendrite hillock)

Answer 5

a.
Where the axon attaches to the cell body (the axon hillock)

Question 6

Which of the following TWO options below are TRUE?
Question 6 Answer

a.
All glycosphingolipids share the same type of head group

b.
All phospholipids share the same backbone

c.
All sphingolipids share the same type of head group

d.
All phosphoglycercides share the same backbone

Answer 6

a.
All glycosphingolipids share the same type of head group

d.
All phosphoglycercides share the same backbone

Question 7

What two molecules supply carbons for the fatty acid chain during fatty acid synthesis?
Question 7 Answer

a.
Acetyl CoA + Malonyl CoA

b.
CO2 + CoA

c.
Acetyl CoA + CO2

d.
Malonyl CoA + CO2

Answer 7

a.
Acetyl CoA + Malonyl CoA

Question 8

What vitamin helps transfer fatty acids to glycerol-3-phosphate when making triglycerides?
Question 8 Answer

a.
B2

b.
Biotin

c.
B5

d.
B3

Answer 8

c.
B5

Question 9

What type of lipid molecule is illustrated here:

Question 9 Answer

a.
Cerebroside

b.
Ganglioside

c.
Sphingomyelin

d.
Phosphoglyceride

Answer 9

c.
Sphingomyelin

Question 10

Which of the following statements is TRUE?
Question 10 Answer

a.
Glucagon activates acetyl CoA carboxylase

b.
Glucagon increases malonyl CoA levels

c.
Glucagon activates beta oxidation

d.
Glucagon activates fatty acid synthesis

Answer 10

c.
Glucagon activates beta oxidation