BIOL 2401 Exam 3 Review

Which of the following conditions triggers the opening or closing of voltage-gated ion channels in a cell?

• Binding with a chemical messenger

• Interacting with a neurotransmitter or hormone

• Changes in the relative distribution of charges

• Binding with amino acid residues

Which of the following best describes the mechanism by which ligand-gated ion channels operate?

• They are gated by a chemical messenger that binds to the channel on the inside or outside of the cell.

• They operate based on the relative distribution of charges in their local environment.

• They respond only to changes in conformation caused by charged amino acid residues.

• They're open or closed based on the depolarization of the cell membrane.

Excitable cells ____________________.

• are found in all tissue types

• only send messages to other cells

• have no nucleus

• can generate an action potential in response to a graded potential

• are also known as astrocytes

• voltage-gated ion channel

• • gated by a change in the charge of their surrounding environment inside the cell

• • gated by a chemical messenger on the inside or outside of the cell

• • the movement of ions and other solutes across the cell membrane without energy input

• the movement of ions and other solutes across the cell membrane using energy

Tags

NGSS.HS-LS1-3

• ligand-gated ion channel

• • gated by a chemical messenger on the inside or outside of the cell

• • the movement of ions and other solutes across the cell membrane without energy input

• • the movement of ions and other solutes across the cell membrane using energy

• • a negatively charged ion

• passive transport

• • the movement of ions and other solutes across the cell membrane without energy input

• • the movement of ions and other solutes across the cell membrane using energy

• • a negatively charged ion

• • a positively charged ion

• active transport

• • the movement of ions and other solutes across the cell membrane using energy

• • a negatively charged ion

• • a positively charged ion

• • gated by a change in the charge of their surrounding environment inside the cell

• anion

• • a negatively charged ion

• a positively charged ion

cation

• a positively charge ion

• a negatively charged ion

Tags

NGSS.MS-PS2-3

What is the resting membrane potential of a typical neuron?

• -70mV

• -60mV

• +61.5mV

• +66mV

• -89mV