You are part of a desert plant research team trying to discover crops that will be productive in arid climates. You discover a plant that, under water-deficit conditions, produces a hormone that triggers a suite of drought responses
Most likely the hormone is _____.
A) abscisic acid
B) gibberellin, or gibberellic acid
C) indoleacetic acid
D) 2, 4-D
E) salicylic acid
Answer: A
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The embryonic root, which is where the pollen tube enters the ovule prior to fertilization, is called the ____
a. suspensor b. epicotyl c. hypocotyl d. endosperm e. cotyledon
A receptor on the cell surface usually has several domains. The function of the external domain is:
a. transmitting the signal to the inside of the cell. b. holding the receptor within the membrane. c. attaching the receptor to the DNA. d. functioning as an enzyme. e. binding the signaling molecule.
What is the purpose of using animals in clinical trials?
A) To test the safety of a compound B) To assess the biological activity of a compound C) To decide how to produce (i.e., manufacture) the compound D) A and B E) A, B, and C
Photosynthesis is not responsible for
A) oxygen in the atmosphere. B) the ozone layer. C) most of the organic carbon on Earth's surface. D) atmospheric CO2. E) fossil fuels.