The specific white blood cells that HIV attaches to are the ____________ cells.  

A.  CD4+
B.  gp120 -T
C.  CCR5-T
D.  CXCR4-T
E.  CD8-T


A.  CD4+

Biology & Microbiology

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Insects are currently thought to have evolved from

a. myriapods. b. animals. c. algae. d. crustaceans. e. all of these.

Biology & Microbiology

The first genetic material on Earth was probably _____

A) DNA produced by reverse transcriptase from abiotically produced RNA B) DNA molecules whose information was transcribed to RNA and later translated in polypeptides C) self-replicating RNA molecules D) oligopeptides located within protobionts

Biology & Microbiology

Oxygen-poor blood becomes oxygen-rich blood in the capillary beds of the

A. alveoli. B. bronchioles. C. larynx. D. bronchi. E. trachea.

Biology & Microbiology

Which option incorrectly pairs a class of sensory receptor with one of the stimuli it detects?

A) electromagnetic receptors—light B) chemoreceptors—molecular structure C) mechanoreceptors—sound D) thermoreceptors—touch

Biology & Microbiology