The first indication that HIV has entered the bloodstream is (are)

a. a rash on the arms and legs.
b. a drop in the white blood cell count.
c. flulike symptoms.
d. Kaposi's sarcoma.
e. the development of Kaposi's sarcoma.


C

Biology & Microbiology

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Biological membranes are held together mainly by ____

a. hydrogen bonds between lipid molecules b. hydration layers over lipid molecules c. exclusion of the nonpolar regions of lipids by water d. hydrogen bonds between water molecules e. surface tension at the interface between layers of water molecules

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Which of the following extraembryonic membranes

is the first site of blood cell formation and the source of germ cells? a. amnion b. yolk sac c. chorion d. allantois e. none of these

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food moves down the esphagus under the influence of gravity alone.

a. true b. false

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A dog's head is at its ________ end, and its belly is its ________ surface

A) posterior; dorsal B) anterior; dorsal C) posterior; ventral D) anterior; ventral

Biology & Microbiology