What is the name of the main embryonic cell layer from which the muscles of the body wall are derived in most metazoans?
a. mesoderm
b. endoderm
c. ectoderm
d. mesoglea
Ans: a. mesoderm
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In meiosis paired homologs align down the center of the cell during
A. metaphase I. B. prophase I. C. prophase II. D. metaphase II. E. anaphase II.
Human population began to rise rapidly following the
A) Industrial Revolution. B) end of World War I. C) period known as the Black Death. D) end of the 20th century. E) end of the Ice Age.
Vitamins classified as antioxidents
What will be an ideal response?
When renin is released:
A) the conversion of angiotensin I to angiotensin II is inhibited, which facilitates excretion of sodium via the kidneys. B) the lungs convert the plasma protein angiotensinogen to angiotensin I, which dilates the renal blood vessels and increases kidney function. C) the pancreatic alpha cells secrete the hormone glucagon, which facilitates the conversion of glycogen to glucose in the liver. D) the angiotensin-converting enzyme (ACE) converts angiotensin I to angiotensin II, which stimulates sodium resorption by the renal tubules