Tumor-suppressor genes _____

A) are frequently overexpressed in cancerous cells
B) are cancer-causing genes introduced into cells by viruses
C) encode proteins that help prevent uncontrolled cell growth
D) often encode proteins that stimulate the cell cycle


C

Biology & Microbiology

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Emotional stress, a diet low in fiber and dehydration can lead to which problem associated with the digestive system?

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What will be an ideal response?

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Rotenone is a poison commonly added to insecticides. Rotenone binds tightly with one of the electron carrier molecules in the electron transport chain, preventing electrons from passing to the next carrier molecule. Insects exposed to rotenone will die

because A) they will no longer be able to perform anaerobic respiration. B) high levels of fermentation products will build up in their bodies. C) they will no longer be able to produce adequate amounts of ATP. D) they will no longer be able to absorb water and will become dehydrated.

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Which list correctly orders the structures through which light must pass on its way to the retina of the human eye?

A) pupil, cornea, aqueous humor, lens B) lens, aqueous humor, pupil, cornea C) cornea, aqueous humor, pupil, lens D) cornea, pupil, aqueous humor, lens

Biology & Microbiology