Hi please help with this question 7. In the following passage, circle the correc

Question

Hi please help with this question

7. In the following passage, circle the correct one of the alternatives. (2 points each; total = 16) “The resting membrane potential is largely determined by the equilibrium potential of Na+ / K + ions, whereas propagation of the action potential in neurons is primarily driven by the flow of Na+ / K + ions across the membrane. When the action potential reaches the presynaptic nerve terminal, special voltage-gated / ligand-gated channels open and cause an increase in the concentration of Cl/ Ca2+ ions in the cytoplasm that in turn results in a release of neurotransmitter from synaptic vesicles. Simultaneous transport of two molecules in the same direction by a transporter protein is called uniport / symport. Ion channels are capable of carrying out only passive / active transport. Compared to transporter proteins, ion channels are characterized by slower / faster transfer rates. The transmembrane ?-helices are largely composed of hydrophobic / hydrophilic amino acids.”

Explanation / Answer

The resting membrane potential is largely determind by the equilibrium potential of K+, whereas propagation of the action potential in neurons is primarily driven by the flow of Na+ across the membrane. When the action potential reaches the presynaptic nerve terminal, special voltage gated channels open and cause an increase in concentration of Ca+ ions in the cytoplasm that in turn result in a release of neurotransmitter from synaptic vesicles. Simultaneous transport of two molecules in the same direction by a transporter protein is called symport. Ion channels are capable of carrying out only passive transport. Compared to transporter proteins, ion channels are characterised by faster transfer rates. The transmembrane alpha helices are largely composed of hydrophobic amino acids.

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