question: What do mutations do to dna?
Options:
- (A) It expands
- (B) Damages them
- (C) negative
- (D) Moisturize it.
- (E) Help it.
- (F) Destroy it.
- (G) It decreases
- (H) Change it.
answer: Mutations may change the structure of a chromosome or just change a single nucleotide. DNA is made up of nucleotides. Mutations change DNA.
The answer is (H)

question: P16 is an example of what type of thing that causes cancer when it stops functiong properly?
Options:
- (A) Toxins
- (B) edema
- (C) gene
- (D) ferns
- (E) CO 2
- (F) PDAs
- (G) HIV
- (H) albino
answer: Cancer is a disease that occurs when the cell cycle is no longer regulated. P16 is a regulator of the cell division cycle. Cancer is a disease that occurs when genes like P16 stop functioning properly.
The answer is (C)

question: How does a squid produce?
Options:
- (A) Energy.
- (B) photons
- (C) voltage
- (D) sexually
- (E) Energy
- (F) bioaerosols
- (G) waves
- (H) food
answer: Mollusks reproduce sexually. Interestingly, a squid is also a mollusk. Squids produce sexually.
The answer is (D)

question: Some crustaceans feed on
Options:
- (A) phytoplankton
- (B) fungi
- (C) refraction of light
- (D) heat energy
- (E) an organism's body
- (F) carbon
- (G) algae
- (H) salt and water.
answer:
Zooplankton are tiny animals that feed on phytoplankton. Many zooplankton are crustaceans. Some crustaceans feed on phytoplankton.
The answer is (A)