Line 1: *Neurons are the structural and functional units of the nervous system. Botulism affects the nervous system. Botulism affects neurons.*
*(F)*
Line 2: *Which of the following affects neurons?
Options:
- (A) nerves
- (B) voltage
- (C) Dehydration
- (D) electrically
- (E) heat
- (F) Botulism
- (G) fever
- (H) temperature*

Logic of a solution: *All chemical reactions require activation energy to get started. Chemical changes are a result of chemical reactions. All chemical changes require activation energy to occur.*
*(C)*
The original question: *What do all chemical changes require to occur?
Options:
- (A) during the day
- (B) heating liquids
- (C) Activation energy
- (D) wavelengths and photons
- (E) Burning fuel and air
- (F) kinetic energy
- (G) electromagnetic energy
- (H) direct energy*

Line 1: *Cancer is a disease that occurs when the cell cycle is no longer regulated. Another critical protein in regulating the cell cycle is the tumor suppressor protein p53 . Cancer is a disease that often results when tumor suppresor proteins, like p53, stop functioning.*
*(B)*
Line 2: *One tumor suppressor protein which often results in cancer when it stops functioning is:
Options:
- (A) gene
- (B) p53
- (C) tumors
- (D) HIV
- (E) enzyme
- (F) tRNA
- (G) DNA
- (H) TRH*

Logic of a solution: *Pollen consists of tiny grains that are the male gametes of plants. Animals that reproduce sexually produce sex cells, or gametes. Pollen consists of tiny grains that are the male sex cells of plants.*
*(F)*
The original question: *What does pollen consist of tiny grains of?
Options:
- (A) it helps plants in growing
- (B) the female sexual organs
- (C) Something with exactly eight protons
- (D) seeds
- (E) Microscopic organisms
- (F) the male sex cells of plants
- (G) bees
- (H) sub-units of species*

Line 1: *Reproduction is the process by which living things give rise to offspring. Sex equals reproduction. Sex is the process by which living things give rise to offspring.*
*(D)*
Line 2: *What is the process by which living things give rise to offspring?
Options:
- (A) DNA
- (B) photosynthesis
- (C) bird
- (D) sex
- (E) subtraction
- (F) gametes
- (G) eggs
- (H) ovum*

Line 1: *Plastics are made from petroleum and produce toxic waste. Pollution issues include toxic waste disposal. Plastics are made from petroleum and produce pollution.*
*(E)*
Line 2:
*What is produced when plastic is made out of petroleum?
Options:
- (A) dangerous
- (B) bioaerosols
- (C) emissions
- (D) hydrocarbons
- (E) pollution
- (F) heat produced
- (G) Pesticides
- (H) heat energy*