CD4 cells are also known as
A. T helper cells.
B.
natural killer cells.
C. T cytotoxic cells.
D.
macrophages.
E.
neutrophils.
A
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The ____ of the eye is a tissue that is densely packed with photoreceptors. In the above diagram of the eye, which
letter identifies it?
a. lens; A b. vitreous body; C c. retina; C d. sclera; A e. cornea; D
The replacement model is supported by
evidence from a. the fossil record. b. DNA sequencing data from mitochondria. c. DNA sequencing data from chromosomes. d. global climate change patterns. e. all of these.
The complement protein cascade is the same for the classical pathway, alternative pathway, and lectin pathway beginning with the activation of
A) C1. B) C2. C) C3. D) C5. E) C6.
Which describes bacteria that require low concentrations of oxygen to survive (less than that in the current atmosphere)?
A) facultative anaerobes B) microaerophiles C) obligate aerobes D) obligate anaerobes