Which of the following is NOT a major feature of
arthropods?
a. jointed appendages
b. exoskeleton
c. paired segmental nephridia
d. specialized and fused-together segments
e. specialized sensory structures
Answer: c
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In humoral immunity, cells that are produced by activated B cells and function by secreting antibodies are called
A. cytotoxic T cells. B. helper T cells. C. plasma cells. D. macrophages. E. memory cells.
Endocytosis and exocytosis are mechanisms of ______ transport
Fill in the blank(s) with the appropriate word(s).
Which of the following types of fat are the least healthy?
A) trans fat B) monounsaturated fat C) saturated fat D) polyunsaturated fat
When a membrane is said to be selectively permeable, this means that _____
A. half of the membrane is permeable, and the other half is not B. only water can pass through it C. the membrane regulates movement of substances into and out of the cell D. the membrane is permeable only part of the time