Logic of a solution: *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)*
The original question: *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*

Line 1: *Some viruses have an envelope of phospholipids and proteins. Phospholipases are the enzymes that degrade phospholipids . Some viruses have an envelope of enzymes and proteins.*
*(B)*
Line 2: *What might have an envelope of proteins and enzymes?
Options:
- (A) fur seals
- (B) some viruses
- (C) Most plants
- (D) a fish
- (E) animal transport
- (F) animals
- (G) chickens
- (H) it needs them*

Logic of a solution: *Shivering occurs when many muscles contract a little bit all at once. Heat production is increased by shivering and non-shivering thermogenesis . Heat production is increased when many muscles contract a little bit, all at once.*
*(B)*
The original question: *When many muscles contract a little bit, simultaenous, it produces:
Options:
- (A) forces
- (B) heat
- (C) cold blooded
- (D) sweat
- (E) electrical energy
- (F) Energy
- (G) pain
- (H) thermal displacement*

Line 1: *Heterotrophs are living things that cannot make their own food. All fish are heterotrophic. Fish cannot make their own food.*
*(H)*
Line 2: *What is one thing fish cannot make?
Options:
- (A) babies
- (B) nests
- (C) matter
- (D) fat
- (E) edible
- (F) Energy
- (G) bubbles
- (H) food*

Logic of a solution: *Glucose is used for energy by the cells of most organisms. Blood Sugar Glucose is sugar. Sugar is used for energy by the cells of most organisms.*
*(A)*
The original question: *What is used as energy by most of the organisms on earth
Options:
- (A) sugar
- (B) heat
- (C) food
- (D) water
- (E) Light
- (F) Energy
- (G) salt
- (H) carbon*

Logic of a solution: *Cell division is more complex in eukaryotes than prokaryotes. Prokaryotes are smaller and simpler than eukaryotes. Cell division is less complex in smaller, simple cells.*
*(D)*
The original question:
*What is less complex in smaller, simple cells?
Options:
- (A) sensory neurons
- (B) Cell death
- (C) peachleaf willow
- (D) Cell division
- (E) Sex
- (F) permineralization
- (G) Veins and arteries.
- (H) Pregnancy*