Homeostasis Unit Test

Front

What is an example of positive feedback?

Back

Childbirth

Front

The maintenance of a relatively stable internal environment

Back

Homeostasis

Front

Against the concentration gradient
low to high uses energy/ATP

Back

active transport

Front

Equal percentage of solutes inside and out.
Concentration of substances is the same.

Back

isotonic

Front

Diffusion of water across a cell membrane from high to low.

Back

osmosis

Front

Engulfs large molecules and moves them inside the membrane.
Uses energy.

Back

endocytosis

Front

The process by which particles naturally vibrate and move from an area of high concentration to an area of lower concentration

Back

diffusion

Answer explanation

Diffusion is the correct answer because it refers to the natural movement of particles from an area of high concentration to an area of lower concentration. Aquaporin, exocytosis, and endocytosis are not related to this process. Aquaporin is a protein that facilitates water transport, while exocytosis and endocytosis are cellular processes involving the movement of substances in and out of cells.

Front

When both sides of the membrane reach similar solute concentrations.

Back

equilibrium

Answer explanation

Equilibrium is the correct answer because it refers to the state when both sides of the membrane have reached similar solute concentrations. In this situation, there is no net movement of solute particles, and the system is considered to be in balance. Osmosis is the process that leads to equilibrium, while concentration and randomness are not directly related to this concept.

Front

The process by which molecules that cannot directly diffuse across the membrane pass through special protein channels

Back

facilitated diffusion

Answer explanation

Facilitated diffusion is the correct answer because it is the process by which molecules that cannot directly diffuse across the membrane pass through special protein channels. Endocytosis, phagocytosis, and exocytosis are different processes that involve the movement of substances into or out of the cell, but they do not involve protein channels for passive transport.

Front

Cells placed in an isotonic solution will:

Back

stay the same (water moves in/out at the same rate)

Answer explanation

In an isotonic solution, the concentration of solutes is the same both inside and outside the cell. This means that water will move in and out of the cell at the same rate, maintaining equilibrium. Therefore, cells in an isotonic solution will stay the same, as water moves in and out at the same rate.