Auxin concentration gradients
a. appear once germination begins.
b. promote the transcription of an enzyme
that breaks down cytokinin.
c. allow formation of plant parts in expected
patterns.
d. help young cells elongate so that shoots and
roots lengthen.
e. are described by all of these EXCEPT
"appear once germination begins."
E
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Most halobacteria are motile by means of lophotrichous flagella
Indicate whether the statement is true or false.
Most myxobacteria
A. are micropredators because they secrete digestive enzymes that lyse bacteria and yeasts. B. produce desiccation resistant dormant myxospores. C. have the ability to aggregate and form a fruiting body under conditions of nutrient limitation. D. All of the choices are correct.
Researchers have used molecular analysis to determine that ____ evolved after flowering plants, but before eudicots
and monocots emerged.
a. auxins b. cytokinins c. jasmonates d. gibbererlins e. ethylene
Which of the following organisms lack membrane bound organelles?
a. plants b. animals c. prokaryotes d. fungi