Antigens are located on the surface of:
A. B lymphocytes.
B. memory cells.
C. pathogens.
D. plasma cells.
C
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. leads to release of a second messenger that ultimately results in hydrolysis of glycogen to glucose b. leads to release of a second messenger that lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
_____ increases the risk of death for an American child under the age of two
a. The presence of an unrelated adult male only b. The absence of a biological father only c. The presence of an unrelated adult female d. Both the absence of a biological father and the presence of an unrelated adult male
What are the three major body regions of many arthropods?
A. head, thorax, and abdomen B. head, abdomen, and legs C. head, thorax, and legs D. head, gastrovascular cavity, and thorax E. head, gills, and legs
Which of the following appeared last in the evolutionary timescale?
What will be an ideal response?