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
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Logistic growth of a population is represented by dN/dt = _____
A) B) rmax N C) rN (K + N) D) rN E) rNrN
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.
The term "segmented" refers to viruses that
A. may contain several pieces of RNA. B. have an icosahedral-shaped capsid. C. are linked together before budding out. D. have an envelope.
The internal membranes within the chloroplast are organized into flattened sacs called ________.
Fill in the blank(s) with the appropriate word(s).