Which factor is responsible for many emerging pathogens in humans?

A) expanded host or tissue range of the pathogen
B) longer life spans resulting in a larger elderly population
C) increased use of antibiotics in the past half-century
D) improved sanitation and hygiene practices
E) availability of vaccines


Answer: A

Biology & Microbiology

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The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are 

A. highly polar.  B.  negatively charged.  C.  non-polar. D.  positively charged.  E.  water soluble.

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The term "segmented" refers to viruses that

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The internal membranes within the chloroplast are organized into flattened sacs called ________.

Fill in the blank(s) with the appropriate word(s).

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