Adhesins
A) allow pathogens to stick to host tissues only in a nonspecific manner.
B) are limited to only a few known types.
C) include molecules that are typically found deep inside the pathogenic cell.
D) include molecules that bind to host factors such as fibronectin, sialic acid, and heparin / heparin sulfate.
E) make poor targets for vaccine development.
Answer: D
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Parapatric speciation occurs most often ____
a. within in the same home range b. populations inhabiting different areas while maintaining contact along a common border c. within a group of interbreeding populations d. on either side of geographic barriers e. by polyploidy
The letter "C" above represents
a. uterus. b. ovary. c. vagina. d. urinary bladder. e. pelvic girdle
The F2 phenotypic ratio of a monohybrid cross is
a. 1:1. b. 2:1. c. 9:3:3:1. d. 1:2:1. e. 3:1.
Chlorophyll b absorbs green wavelengths of light that chlorophyll a cannot absorb. In this respect, chlorophyll b acts as
A. an energizer for photosynthetic bacteria. B. a light absorber in the green light. C. a more efficient pigment. D. an accessory pigment.