Which of the following plant hormones was studied in the 1880s by Charles and Francis Darwin in experiments on phototropism?
A. abscisic acid
B. ethylene
C. cytokinin
D. auxin
E. gibberellin
Answer: D
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Cartilage injuries do not repair themselves because ________. a. All of these choices are reasons cartilage injuries do not repair themselves
b. cartilage does not receive nutrients very easily c. cartilage does not contain blood vessels d. None of these are reasons as cartilage does heal itself. e. cartilage does not divide in adults
The technique used to initially identity promoter sequences was
A) DNA fingerprinting. B) chromosomal walking. C) DNA footprinting. D) chromatin immunoprecipitation assay. E) RNA protection.
Erosion of the gastrointestinal tract that results in a sore is called a ________
A) pore B) chancre C) peptic ulcer D) diverticulum
Do active ways of crossing a plasma membrane require an expenditure of chemical energy?
What will be an ideal response?