The immune system’s attack on the body’s own cells
a. is an autoimmune response.
b. results in anaphylactic shock.
c. is a type of acquired immune deficiency
syndrome.
d. is due to the inactivation of helper T cells.
e. is due to an error in the production of MHC
markers.
Answer: a
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Which of the following is NOT one of the signs of aging in the skin?
a. increased collagen b. reduced fibroblasts c. increase in sweat glands d. less pigmentation in hair e. increased fat deposits
The type of cleavage pattern represented in Figure 51-1 is:
a. holoblastic and radial.
b. holoblastic and spiral.
c. meroblastic and radial.
d. meroblastic and spiral.
e. holoblastic and mosaic.
Which part of a vascular plant performs most of the photosynthesis that is conducted by the plant?
a. the ground tissue b. the protoderm c. the dermal tissue d. the vascular tissue
To retrieve a sample from a culture tube with an inoculating loop, the cap of the tube is
What will be an ideal response?