1.) Most vitamins are often components of ___. A.) enzymes
B.) coenzymes
C.) food
D.) energy molecules

2.) The function of an enzyme is to
A.) give energy to a reaction.
B.) act as a buffer in a reaction.
C.) increase the concentration of the substrate.
D.) speed up a reaction.

3.) Meiosis results in a change in chromosomal number as shown by
A.) 2n to 2n.
B.) 2n to n.
C.) n to 2n.
D.) n to n.

4.) The cell that is formed through fertilization is called a(n)
A.) gamete.
B.) sperm cell.
C.) egg cell.
D.) zygote.
E.) embryo.

5.) The first checkpoint in the cell cycle occurs at .
A.) G1
B.) S
C.) G2
D.) mitosis

6.) Normal human somatic (body) cell would have
chromosomes.
A.) 4
B.) 23
C.) 45
D.) 46
E.) 47

7.) In human, mitosis occurs in
A.) liver only.
B.) heart only.
C.) ovaries only.
D.) testes only.
E.) either ovaries or testes.
F.) all organs.

8.) Most enzymes are classified as
A.) carbohydates.
B.) proteins.
C.) lipids.
D.) nucleic acids.
E.) DNA.

9.) Entropy ofter is referred as
A.) ATP.
B.) usable energy.
C.) unusable energy.
D.) potential energy.

10.) An example of potential energy is
A.) muscle contraction.
B.) transporting molecules.
C.) rocks on a hill.
D.) rocks rolling down the hill.

11.) Which is part of enzyme?
A.) substrate
B.) product
C.) coenzyme
D.) active site
E.) reactant