Which of the following is not a type of natural selection?
A. disruptive selection
B. directional selection
C. artificial selection
D. All of the answer choices are correct.
E. stabilizing selection
C. artificial selection
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Vector-borne transmission can be either external or internal. In external (mechanical) transmission, the pathogen is carried
A. on a fomite. B. within the vector. C. on the body surface of a vector. D. All of the choices are correct.
Of the G3P generated in the Calvin cycle, 5/6 will be used to regenerate RuBP. A company
manufacturing widgets would go out of business if 5/6 of the widgets were recycled at the manufacturing site rather than being sold. And yet plants survive this extreme inefficiency. Why?
a. Actually, 5/6 of the G3P is used to build glucose and only 1/6 of the G3P is needed to regenerate RuBP. b. Plants are extremely efficient in other ways and that compensates for this anomaly. c. There is unlimited CO2 for the plant to use, so it's okay to "waste" some by regenerating RuBP. d. The plant expends no energy to acquire the light energy that drives the Calvin cycle, so there is no pressure on the system to become more efficient. e. The cyclic pathway of the light reactions compensates for the energy lost in RuBP regeneration.
The condition ____________________ can occur when an Rh- woman becomes pregnant by an Rh+ man. Fill in the blank(s) with the appropriate word(s)
What does the presence of similar genes in very dissimilar organisms imply?
a. the genes were produced by different selection pressures b. the organisms share a common ancestor c. the organisms do not share a common ancestor d. the genes became identical through mutation