A response to what occurs when many muscles contract a little at once?
Options:
- (A) heat
- (B) cold
- (C) sweat
- (D) pain
- (E) forces
- (F) stress
- (G) comfort
- (H) motion
--
Let's think first: Shivering occurs when many muscles contract a little bit all at once. Another response to cold is shivering. A response to cold occurs when many muscles contract a little at once.... So the answer is [(B)]

If a tumor has formed, this gene might have mutated:
Options:
- (A) p53
- (B) SNPs
- (C) OCA 2
- (D) DNA
- (E) gene
- (F) tRNA
- (G) malignancy
- (H) TRH
--
Let's think first: Cells that divide uncontrollably may form a tumor, or abnormal mass of cells. When p53 is mutated, cells divide uncontrollably. When p53 is mutated a tumor may form.... So the answer is [(A)]

What is used for energy in most cells?
Options:
- (A) sugar
- (B) sodium
- (C) muscle
- (D) maples
- (E) calcium
- (F) food
- (G) silicon
- (H) Energy
--
Let's think first: Glucose is used for energy by the cells of most organisms. Blood Sugar Glucose is sugar. Sugar is used for energy for the cells of most organisms.... So the answer is [(A)]

What has a range of sexual reproductive systems?
Options:
- (A) Computer systems.
- (B) Most plants
- (C) animals
- (D) Roundworms.
- (E) mammals
- (F) Art reproductions.
- (G) insects
- (H) Stuffed toy bears.
--
Let's think first: Roundworms make up the phylum Nematoda. Within the Nematoda, a range of reproductive systems occur. A range of reproductive systems occur in roundworms.... So the answer is [(D)]

Plants can be infected by what?
Options:
- (A) human pathogens
- (B) infected meat
- (C) Pesticides
- (D) insects
- (E) human papillomavirus
- (F) viruses
- (G) fungi
- (H) bacteria
--
Let's think first: Viruses infect and live inside the cells of living organisms. Plants are complex living organisms. Viruses infect and live inside the cells of plants.... So the answer is [(F)]

Mussels have what?
Options:
- (A) seaweed
- (B) arms
- (C) Energy
- (D) a shell
- (E) warmth
- (F) bacteria
- (G) Length
- (H) legs
--
Let's think first: Most mollusks have shells. Mussels are bivalve mollusks. Mussels have shells.... So the answer is [(D)]