Which of the following types of plant hormones triggers plant responses to environmental stresses
such as cold snaps, high salinity, and drought?
a. abscisic acid
b. cytokinins
c. oligosaccharins
d. jasmonates
e. ethylene
A
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SARS symptoms include ____
a. high fever, headaches, and respiratory problems b. brittle bones and rash c. heart arrhythmia, kidney failure, and calcium depletion d. liver cirrhosis and difficulty swallowing e. eye pain, loss of vision, and headaches
Most organ transplants fail because
a. of poor vascular connection between host and donor tissue. b. the migrating leukocytes attack the tissue adjacent to the transplant. c. cytotoxic T cells enter the transplant through the connecting blood vessels and kill the individual transplant tissue. d. introduced tissues produce antibodies that cause a massive reaction. e. of all of these.
Animals store carbohydrates in the form of ____
a. glycogen b. starch c. glucose d. sucrose e. lipids
Two populations of organisms belong to the same biological species when they
A) cannot mate with each other because mating occurs at different times. B) use different types of behaviors or physical features to attract mates. C) have anatomical features that make it difficult for organisms from the two populations to mate with one another. D) encounter each other, mate, and produce viable, fertile offspring under natural conditions.