The human immunodeficiency virus mounts a direct attack on TH cells by recognizing the _______ surface proteins associated with these cells.  

A.  Fc
B.  CD4
C.  epitope
D.  cytokine


B.  CD4

Biology & Microbiology

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The pigment most involved with photoperiodism is ____.

A. chlorophyll B. xanthophyll C. anthocyanin D. phytochrome E. phycoerythrin

Biology & Microbiology

If the phage types of isolates are identical, and a connection exists between the isolates, the chances are great that they are epidemiologically related.

A) True B) False

Biology & Microbiology

All of the following can be recognized by toll-like receptors, except 

A. flagellin. B. host cell membrane proteins. C. single-stranded viral RNA. D. lipopolysaccharide. E. lipoteichoic acid.

Biology & Microbiology

What hormone is tested for in pregnancy tests?

A. Luteinizing hormone B. Follicle stimulation hormone C. Progesterone hormone D. hCG hormone E. Estrogen hormone

Biology & Microbiology