Unit 3 (Lecture Quiz)

Question 1

The axon branches of a typical neuron terminate at structures called

a) synapses
b) boutons
c) dendrites
d) nodes
e) glia

Answer 1

b) boutons

Question 2

What happens to neurons in the approach known as optogenetics?

a) Fusion of neurotransmitter vesicles to the presynaptic membrane is blocked.
b) Mutations to ion channel proteins are corrected.
c) The neurons are made to express light-sensitive ion channels.
d) Leakage of cytoplasmic polyanions is blocked.
e) Neurotransmitter stores are depleted.

Answer 2

c) The neurons are made to express light-sensitive ion channels.

Question 3

Each of the following is an intracellular messenger except

a) calcium ions
b) cAMP
c) IP3
d) DAG
e) insulin

Answer 3

e) insulin

Question 4

Ecdysone is an steroid hormone and binds to its receptor, EcR located at the cell membrane.

a) True
b) False

Answer 4

b) False

Question 5

The cdc25 mutant inhibits the transition of G2 phase to M phase and as a consequence produces very small cells.

a) True
b) False

Answer 5

b) False

Question 6

The concentration of Cyclin dependant kinase is constant throughout the cell cycle.

a) True
b) False

Answer 6

a) True

Question 7

If you stain the DNA of cells and pass them through a flow cytometer you can know how many are in G1 and in G2 phases.

a) True
b) False

Answer 7

a) True

Question 8

Which organisms were initially used to describe the molecules behind the regulation of the cell cycle ?

a) Yeast and sea urchins
b Yeast and Xenopus
c) Yeast and Drosophila
d) Human cells in culture
e) Drosophila and Mouse

Answer 8

a) Yeast and sea urchins

Question 9

Which of the following best describes the function of a kinase?

a) it degrades proteins
b) it is a DNA binding protein
c) it glycosylates proteins
d) it removes a phosphate group from proteins
e) it phosphorylates proteins

Answer 9

e) it phosphorylates proteins