The Treponema pallidum of syphilis can be transmitted by

A. sexual or oral contact.
B. contact with contaminated objects.
C. clothing.
D. the fecal-oral route.


A.

Biology & Microbiology

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The amniotic egg of reptiles, birds, and mammals is an adaptation to

(a) thwart carnivorous predators. (b) allow life on land. (c) compensate for the short period of development of the young. (d) protect the young from the nitrogenous wastes of the mother during embryonic development.

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What type of cross is performed to determine the genotype of an individual?

A) A testcross B) A dihybrid cross C) A monohybrid cross D) A genotyping cross E) A controlled cross

Biology & Microbiology

Place the following events of an inflammatory event in response to bacterial infection in proper order

1. Activated complement binds to bacteria. 2. Capillary permeability increases. 3. Phagocytes engulf bacteria. 4. Mast cell receptors bind to bacterial antigens. 5. Signaling molecules cause arterioles to widen.

a. 4-5-2-1-3 b. 4-3-1-2-5 c. 5-2-1-4-3 d. 1-3-4-2-5 e. 5-2-4-1-3

Biology & Microbiology

_____ prevents seeds from germinating until conditions are favorable for the growth of the plant

A) Ethylene B) Zeaxanthin C) Gibberellin D) Abscisic acid

Biology & Microbiology