Biology Chapter 2 Review: The Chemistry of Life

Nucleotides consist of a phosphate group, a nitrogenous base, and what?

• fatty acid

• lipid

• 5-carbon sugar

• 6-carbon sugar

1. An enzyme speeds up a reaction by ...

• releasing energy

• absorbing energy

• lowering the activation energy

• raising the activation energy

In which of the following ways do isotopes of the same element differ?

• In number of neutrons only

• In number of protons only

• In number of neutrons AND protons

• In number of neutrons AND in mass

Protons have a ____ charge.

• positive

• negative

• neutral

• no charge

Electrons have a ___ charge.

• Positive

• Negative

• Neutral

• No Charge

Electrons have a ___ charge.

• Positive

• Negative

• Neutral

• No Charge

Neutrons have a ___ charge.

• Positive

• Negative

• Neutral

• No Charge

Which of the following is NOT an organic molecule found in living organisms?

• lipid

• sodium chloride

• nucleic acid

• protein

Which of the following is NOT an organic molecule found in living organisms?

• lipid

• sodium chloride

• nucleic acid

• protein

1. Chemical bonds that involve the total transfer of electrons from one atom or group of atoms to another are called __________.

• covalent bond

• hydrogen bond

• ionic bond

• van der Waals bond