Biology Regents Review

Front

What is a food web?

Back

A food web is a complex network of feeding relationships among various organisms in an ecosystem, showing how energy and nutrients flow through different trophic levels.

Front

Which organism receives the least amount of energy from producers in a food web?

Back

Typically, top predators like hawks receive the least amount of energy because energy decreases as it moves up the food chain.

Front

What is active transport?

Back

Active transport is the process of moving molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy (ATP).

Front

What are lipids?

Back

Lipids are organic compounds that are hydrophobic and serve as stored energy and structural components of cell membranes.

Front

What is diffusion?

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What happens to carbon dioxide in a cell during diffusion?

Back

Carbon dioxide typically diffuses out of the cell, as it is usually at a higher concentration inside the cell compared to the outside.

Front

What is the role of oxygen in cellular respiration?

Back

Oxygen is used in cellular respiration to help convert glucose into energy (ATP), producing carbon dioxide and water as byproducts.

Front

What is the concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives diffusion.

Front

What is the significance of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, maintaining homeostasis and allowing communication with the environment.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.