Unit Test: Biochemistry - The Chemistry of Life

(True or False) Enzymes are able to make any reaction take place.

• True

• False

(True or False) Without enzymes the chemical reactions of the cell would proceed so slowly that the cell would die.

• True

• False

(True or False) The shape of an enzyme is so specific that only one type of substrate can fit.

• True

• False

The space surrounding the nucleus of an atom contains which of the subatomic particles?

• protons

• electrons

• neutrons

• ions

• all of the above

When an atom loses electrons, it forms an ion of what charge?

• negative

• positive

• neutral

• it could be positive or negative.

If a substance like sugar dissolves in water, sugar would be the:

• solvent

• solute

• reactant

• ion

• heterogeneous solution

The nucleus of an atom is composed of:

• protons and electrons

• protons and neutrons

• neutrons and electrons

• protons, neutrons and electrons

A substance formed by the combination of two or more elements in a definite proportion is called a(n):

• mixture

• solution

• compound

• atom

• ion

Covalent bonds are formed when:

• electrons are shared

• electrons are transferred

• protons are shared

• protons are transferred

The three particles that make up an atom?

• protons, neutrons, isotopes

• positive, negative, neutral

• neutrons, isotopes, electrons

• protons, neutrons, electrons