Pneumocystis jiroveci is
A) easy to grow in the laboratory.
B) actually a protozoan and not a fungus.
C) an obligate parasite that cannot survive outside the lungs.
D) a common member of the human respiratory microbiota.
E) a member of the human microbiota that is an obligate parasite.
E
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The orderly pattern of gathering and analyzing information in science is called: a. the scientific method
b. a hypothesis. c. inductive reasoning. d. deductive reasoning.
Water and minerals can move from one cell to another in the intracellular pathway through the
A. Casparian strip. B. guard cells. C. companion cells. D. plasmodesmata. E. stomata.
The size of a plant's seeds reflects an evolutionary trade-off. Large, heavy seeds contain ample nutrients to fuel seedling growth but may not travel far. In contrast, small seeds store limited nutrients but disperse far and wide. Human-cultivated crops typically have larger seeds than do their wild ancestors. How has human farming altered the evolution of these crops?
A. We grow the plants under conditions that favor the growth of larger seeds. B. By using fertilizers, the seeds do not need to store as many nutrients. C. We have created crop plants that are more competitive in the wild than their ancestors. D. Because we spread the seeds, we can spread more smaller seeds per acre, thus favoring these plants. E. We have removed the selection pressure favoring small seed size.
X inactivation occurs
a. at birth. b. at the beginning of the second trimester. c. after the first cleavages of the zygote. d. at the moment of conception. e. randomly depending on the individual.