Biology Keystone Exam Review

Front

How does the structure of alveoli allow lungs to function properly?

Back

They increase the surface areas of the lungs, allowing efficient gas exchange.

Front

Effect of low density of frozen water in a lake?

Back

When water in a lake freezes, it floats, providing insulation for organisms below.

Front

What functional characteristic of proteins distinguishes them from carbohydrates?

Back

Ability to catalyze biochemical reactions

Front

The diagram models how a poison bonds to the active site of an enzyme. Which function is the enzyme MOST LIKELY unable to perform because of the attachment of the poison molecule?

Back

The catalysis of the reaction with the substrate.

Front

What happens to the enzyme when the temperature of the reaction increases to 63 degrees?

Back

The enzyme changes shape and can no longer speed up the reaction.

Front

A protein in a cell membrane changed its shape to move sodium and potassium ions against their concentration gradients. Which molecule was MOST LIKELY used by the protein as an energy source?

Back

ATP

Front

What determines the direction that carbon dioxide and oxygen molecules move across a plasma membrane?

Back

Concentration gradient across the plasma membrane.

Front

Which activity does a fish most likely use to maintain homeostasis within its body?

Back

Exchanging gases through its gills to regulate oxygen levels.

Front

Mitosis and meiosis are processes by which animal and plant cells divide. Which statement best describes a difference between mitosis and meiosis?

Back

Mitosis produces genetically identical daughter cells.

Front

Which event most likely occurs next in mitosis?

Back

The cell membrane pinches inward to divide the cytoplasm.