What do catalysts do?
Options:
- (A) metabolic reaction
- (B) breathe
- (C) get chemical reactions started
- (D) Slowing the transfer of heat
- (E) A compound that donates proton
- (F) fertilize eggs
- (G) have a positive impact on the environment
- (H) inhibit chemical reactions
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Let's think first: All chemical reactions require activation energy to get started. Catalysts lower the activation energy for reactions. Catalysts help chemical reactions to get started.... So the answer is [(C)]

Neurons are the structural and functional units of where what is critical?
Options:
- (A) organs
- (B) Glial cells
- (C) nerves
- (D) Structural units
- (E) voltage
- (F) Storage units
- (G) Critical care
- (H) A computer
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Let's think first: Neurons are the structural and functional units of the nervous system. Glial cells perform critical functions in the nervous system. Neurons are the structural and functional units of where the glial cells perform critical functions.... So the answer is [(B)]

What fiber can be found only in warm-blooded animals?
Options:
- (A) teeth
- (B) birth marks
- (C) muscle
- (D) taste buds
- (E) hair
- (F) wool
- (G) sugar
- (H) fur
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Let's think first: Hair is a fiber that is found only in mammals. All mammals are warm-blooded. Hair is a fiber that is found only in warm-blooded animals.... So the answer is [(E)]

Which is the most likely cause of throat tumors?
Options:
- (A) cigars
- (B) Allergies
- (C) viruses
- (D) Pesticides
- (E) rocks
- (F) doctors
- (G) the skin
- (H) water
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Let's think first: Some viruses can cause cancer. Lung cancer is a formation of tumors in the lung. Some viruses result in the formation of malignant tumors.... So the answer is [(C)]

What can dna contain the instructions for?
Options:
- (A) keeps the organism warm
- (B) Something to move
- (C) Plant reproduction
- (D) a single protein
- (E) A computer
- (F) Animal survival
- (G) survival
- (H) an engine
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Let's think first: Most genes contain the instructions for a single protein. Genes are made of DNA, the substrate of hereditary information. DNA can contain the instructions for a single protein.... So the answer is [(D)]

What may be stored in sedimentary rock for millions of years.
Options:
- (A) Sand castles
- (B) Chemical energy
- (C) heat energy
- (D) Millions of dollars.
- (E) A fuel source.
- (F) Energy.
- (G) In sediment
- (H) Stored animal fur.
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Let's think first: Carbon may be stored in sedimentary rock for millions of years. Carbon is the fuel source. A fuel source may be stored in sedimentary rock for millions of years.... So the answer is [(E)]