Logic of a solution: *Lipids may consist of fatty acids alone, or they may contain other molecules as well. All biological membranes contain lipids as the major constituent. All biological membranes have lipids as the main consituent which consist of fatty acids.*
*(C)*
The original question: *What is the major thing that biological membranes consist of?
Options:
- (A) chemicals
- (B) glucose
- (C) lipids
- (D) Energy
- (E) complex
- (F) oxygen
- (G) matter
- (H) an ion*

Line 1: *Humans have collected and grown mushrooms for food for thousands of years. Yeast and mushrooms are types of fungus. Humans have collected and grown types of fungus for food for thousands of years.*
*(F)*
Line 2: *What have humans collected and grown for thousands of years?
Options:
- (A) Organic compounds
- (B) types of coral
- (C) types of ferns
- (D) bioaerosols
- (E) Most plants
- (F) types of fungus
- (G) types of pine trees
- (H) peachleaf willow*

Logic of a solution: *Muscle contraction occurs when muscle fibers get shorter. Movement is based on the contraction of muscles. Movement happens when muscle fibers get shorter.*
*(F)*
The original question: *What do muscle fibers need to do to enable movement?
Options:
- (A) Bend
- (B) strength
- (C) exercise
- (D) ligt
- (E) It expands
- (F) shorten
- (G) Vibrates
- (H) stay warm*

Line 1: *Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Familiar types of gamete include the female ovum , or egg cell, and the male sperm cell. Fertilization occurs when the male and female gametes fuse to form a diploid zygote.*
*(B)*
Line 2: *When gametes fuse, the resultant zygote is:
Options:
- (A) fertile
- (B) diploid
- (C) Flowers
- (D) grow
- (E) infected
- (F) It expands
- (G) pollen
- (H) seeds*

Logic of a solution: *Glucose is used for energy by the cells of most organisms. Food is converted into glucose. Food is used for energy by most organisms.*
*(G)*
The original question: *What uses food for energy?
Options:
- (A) Most plants
- (B) no organisms
- (C) agriculture
- (D) the Moon
- (E) animals
- (F) athletes
- (G) most organisms
- (H) the Sun*

Logic of a solution: *Cancer is a disease that occurs when the cell cycle is no longer regulated. And leukemia and lymphoma are forms of cancer. Leukemia is a disease that occurs when the cell cycle is no longer regulated.*
*(E)*
The original question:
*What is a disease that occurs when the cell cycle is no longer regulated?
Options:
- (A) dangerous
- (B) illness
- (C) Smoking
- (D) Mumps
- (E) Leukemia
- (F) parasites
- (G) Measles
- (H) Diabetes*