1) Neurons propagate signals in the form of action potentials that are mediated by: a.- Na + channels regulated by voltage that open in response to membrane depolarization b.- K + channels regulated b

1) Neurons propagate signals in the form of action potentials that are mediated by:

a.- Na + channels regulated by voltage that open in response to membrane depolarization

b.- K + channels regulated by voltage coupled to neurotransmitters

c.- Ca ++ channels that connect electrical signals to chemical

d.- Chlorine channels regulated by voltage

2) Which of these molecules do not intervene in the Krebs cycle:

a.- Acetyl CoA

B.- Pyruvate

c.- FAD

d.- NAD

3) It is a ligand responsible for the opening of ion channels in the neuromuscular plate

a.- adrenaline

b.- acetylcholine

c.- sodium

d.- calcium

4) Cystic fibrosis is a serious hereditary disease in which there is:

a.- mutation of the genes that code for ABO surface ag

b.- mutation of the genes that encode the proteins that make up the cell's crust

c.- mutation in the genes that encode the proteins that make up the ion channels

d.- mutation in the ligand that regulates the opening of Ca ++ channels

5) In the previous case the CTFR protein works as:

a.- Calcium channel regulated by cyclic AMP

b.- Channel of k + regulated by cyclic AMP

c.- Na + / K + pump

d.- Chlorine channel regulated by cAMP