Unit 2 Test Review

Atoms and Elements

100

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

Ionic bonds

200

List the three subatomic particles and their charges.

Protons: positive

Electrons: negative

Neutrons: neutral

300

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

A. in number of neutrons only

B. in numbers of neutrons and protons

C. in number of protons only

D. in number neutrons and in mass

A. in numbers of neutrons only

400

Two or more atoms are joined in definite amounts in any what?

Compound

500

A covalent bond is formed by the

A. gaining of electrons

B. losing of electrons

C. sharing of electrons

D. transfer of electrons

C. sharing of electrons

Properties of Water

100

Cohesion is the attraction of molecules of the same or different substance?

same

200

Adhesion is the attraction of molecules of the same or different substance?

different

300

Mixing sugar in boiling water is an example of homogeneous mixture or heterogeneous mixture?

homogeneous

400

If a substance has a pH of 4, is that substance acidic, basic, or neutral?

acidic

500

Which is the most basic substance from the list below:

Bleach - 13

Lemon juice - 2

Water - 7

Milk - 6

Bleach

Macromolecules 1

100

Which of the following is not a macromolecule found in living things?

A. proteins

B. nucleic acid

C. sodium chloride

D. lipid

C. sodium chloride

200

Which macromolecule is responsible for cell growth and repair?

protein

300

Proteins are polymers formed from ____.

amino acids

400

Which out of these substances is a monosaccharide?

glucose, sucrose, starch, or cellulose

glucose

500

Which macromolecule is made up of glycerol and fatty acid?

lipid

Macromolecules 2

100

Nucleotides consist of  a phosphate group, a nitrogenous base, and a ____.

5-carbon sugar

200

Carbohydrates are made of all of the following elements except:

A. carbon

B. hydrogen

C. oxygen

D. sodium

D. sodium

300

Which macromolecule stores genetic information?

Nucleic acids

400

What is the main function of RNA in a cell?

A. to make proteins

B. to store energy

C. to make up genes

D. to aid intracellular digestion

A. to make proteins

500

In addition to carbon, which four elements are most commonly found in nucleic acids?

hydrogen, oxygen, nitrogen, and phosphorus

Chemical Reactions and Enzymes

100

An enzyme speeds up a reaction by ____ the activation energy.

lowering

200

In a chemical reaction, what is the place called where a reactant bind to an enzyme?

active site

300

The elements or compounds that enter into a chemical reaction are called ____.

Reactants

400

Which of the following is a chemical change?

A. ice melting into water

B. baking a cake in the oven

C. shredding paper

D. cheese melting on a burger

B. baking a cake in the oven

500

What kind of temperature and pH is needed for enzymes to work efficiently?

optimum