When soil is dry, guard cells respond to _____ by collapsing against one another, so stomata close
a. air temperature c. abscisic adic
b. low humidity d. oxygen
C
Biology & Microbiology
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About ________ percent of the human genome sequence comes from retroviruses.
A) 4 B) 8 C) 12 D) 21
Biology & Microbiology
A surge in which hormone is responsible for ovulation?
A) estrogen B) FSH C) LH D) progesterone
Biology & Microbiology
How does loading of most carbohydrates into companion cells at a source occur?
a. by diffusion of water from the xylem b. by osmosis c. by active transport d. by proton pumping
Biology & Microbiology
Which of the following types of microbe was NOT observed by Leeuwenhoek?
A) fungus B) protozoan C) prokaryote D) alga E) virus
Biology & Microbiology