Which two plant hormones are mainly responsible for leaf abscission?
a) Auxin and ethylene
b) Gibberellic acid and auxin
c) Ethylene and brassinosteroids
d) Brassinosteroids and strigolactones
e) Strigolactones and jasmonates
Ans: a) Auxin and ethylene
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Some bacteria are metabolically active in hot springs because _____
A) they are able to maintain a lower internal temperature B) high temperatures make catalysis unnecessary C) their enzymes have high optimal temperatures D) their enzymes are completely insensitive to temperature E) they use molecules other than proteins or RNAs as their main catalysts
Which one of the following is least likely to be found in a nucleotide?
A. one or more phosphate groups B. a five-carbon sugar C. a side chain D. a nitrogen-containing base E. All of the answer choices are equally likely to be found in a nucleotide.
What change does binding of the sperm membrane to the oocyte membrane elicit?
a. The oocyte dispels its nucleus. b. The oocyte begins cleavage. c. The oocyte completes meiosis II. d. The sperm returns back to the oviduct. e. The sperm releases a polar body.
Which of the following is acellular?
A. virus B. bacterium C. fungus D. protozoan