Biology HN SEMSTER 1 Review

Front

What does a biological molecule that acts as an acid do in water?

Back

It donates a proton (H⁺) to the solution.

Front

What is a substance that consists of only one kind of atom?

Back

Element.

Front

What does a base produce in solution?

Back

Hydroxide ions.

Front

What are the products in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

Which phase of the cell cycle ensures that DNA is correctly replicated?

Back

S phase.

Front

What is the role of an enzyme in a biological reaction?

Back

It acts as a catalyst to speed up the reaction without being consumed.

Front

What is a substrate in the context of enzyme activity?

Back

The reactant that an enzyme acts upon.

Front

What is the definition of an ion?

Back

An atom or molecule that has a net electric charge due to the loss or gain of one or more electrons.

Front

What is an isotope?

Back

Atoms of the same element that have different numbers of neutrons.

Front

What is the function of hydroxide ions in a solution?

Back

They increase the pH, making the solution more basic.