Which white blood cell type is usually the first
to encounter an invading pathogen?
a. B cell
b. T cell
c. macrophage
d. natural killer cell
e. basophil
C
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In the early 1900s, many people, particularly in the southern U.S., suffered from infections
with parasitic hookworms. Many of these hookworms feed on blood cells of the host and thus also consume iron that is found in red blood cells. A symptom of a heavy infection is a craving to eat dirt—particularly clay-like soils with a high iron content. Thus, for these people, iron is a __________.
a. tradeoff b. constraint c. part of the organism’s niche d. nonlimiting resource
Carbon dioxide that dissolves into the ocean forms ________ acid
Fill in the blank(s) with correct word
The preprophase band consists of chromosomes aligned in a particular pattern
____________________ Indicate whether the statement is true or false.
A region of the nephron that regulates the blood pressure in the afferent arteriole, which stimulates the release of aldosterone, is the ________
A) juxtaglomerular apparatus B) glomerulus C) glomerular capsule D) loop of the nephron