Companion cells function to ________
a. form living tubes for sugar transport
b. load sugar into sieve tubes
c. photosynthesize and produce sugar
d. transport water throughout the plant
b
Biology & Microbiology
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The two most important alcohol germicides are ________ and ________.
A. methanol; isopropanol B. ethanol; isopropanol C. methanol; butanol D. ethanol; methanol
Biology & Microbiology
Blood vessels that return blood from capillaries back to the heart are
(a) arteries. (b) veins. (c) portal veins. (d) arterioles
Biology & Microbiology
Genetic engineering started with
a. bacteria. b. viruses. c. fungi. d. plants. e. animals.
Biology & Microbiology
Which of the following is a characteristic of living organisms?
A) Maintenance and regulation of internal conditions B) Ability to produce energy C) Have a nucleus D) Eat other organisms E) Have membrane-bound organelles
Biology & Microbiology