Chapter 2 Biochemistry Honors

Isotopes are atoms of the same element with the same number of protons and

• a different number of electrons.

• a different number of molecules

• a different number of neutrons.

• the same number of neutrons.

Which of the following makes up a molecule of water?

• one atom of hydrogen and one atom of oxygen

• one atom of sodium and one atom of chlorine

• one atom of hydrogen and two atoms of oxygen

• two atoms of hydrogen and one atom of oxygen

 A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York State varies from 4.22 to 4.40. According to these figures, the most acidic rainfall in New York State has a pH of

•  4.22

• 4.30

• 4.35

• 4.40

A solution with a pH of 6 is

• Neutral

• Basic

• Acidic

• Not enough information given

Which of the following is NOT a function of proteins?

• store and transmit heredity

•  help to fight disease

•  control the rate of reactions and regulate

• cell processes build tissues such as bone and muscle

 Enzymes affect the reactions in living cells by changing the

• products of the reaction

• speed of the reaction.

• the temperature of the reaction.

• pH of the reaction.

When is a solution has an equal number of H+ and –OH ions then the pH will be

• acid

• base

• neutral

• buffer

What type of macromolecule is insoluble in water?

• carbohydrate

• lipid

• protein

• nucleic acid

What is the polysaccharide that makes up an insect's exoskeleton?

• cellulose

• Glycogen

• Starch

• Chitin

What is the term used to describe the energy needed to get a reaction started?

• adhesion energy

• activation energy

• cohesion energy

• chemical energy