As hominins diverged from other primates, which of the following appeared first?
A) reduced jawbones
B) language
C) bipedal locomotion
D) the making of stone tools
E) an enlarged brain
Answer: C
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The partitions that separate the segments of the annelid body are known as
A. pseudocoels. B. nephridia. C. setae. D. septa. E. radula.
Approximately what percentage of the human genome encodes proteins?
a. 1 b. 3 c. 5 d. 15 e. 50
Blood pressure is carefully regulated by a negative feedback control system in the body. When the blood pressure falls below a set point, this decreased pressure is detected by baroreceptors (pressure receptors) in the aorta and carotid arteries
These receptors send signals to a region of the brain known as the medulla oblongata. This region of the brain integrates incoming signals and sends signals to the heart to increase the strength of contractions and to the blood vessels, to constrict arterioles so as to increase the blood pressure, returning it to normal. Based on this information, identify each of the parts of this control system: a) controlled variable b) sensor c) control center d) effector(s)
How many polypeptide chains comprise a hemoglobin molecule?
A) two B) one C) four D) two or four E) three