About how many years after quitting smoking does it take for the risk of heart disease and death to return to the levels similar to those seen in people who never smoked?

A) 1
B) 5
C) 10
D) 15


D

Biology & Microbiology

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The HIV genome is especially prone to mutation because

A. it is made of DNA. B. it is an emerging virus. C. it is copied by reverse transcriptase, which lacks a proofreading function D. of the many different drugs HIV patients must take.

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Viral infections are not considered a risk factor for autosomal trisomy because a virus cannot affect human chromosome arrangement

a. True b. False Indicate whether the statement is true or false

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What makes phospholipids good at forming cellular membranes?

A. Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer. B. The polar and non-polar regions create an amphipathic bilayer of phospholipids. C. Covalent and ionic bonds between glycerols create a tight seal around the cell. D. The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape.

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A molecule of chlorophyll increases in potential energy when one of its electrons is boosted to a higher-energy excited state on being struck by a photon of light

a. true b. false

Biology & Microbiology