Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?
A. cytokinin
B. gibberellins
C. auxin
D. abscisic acid
Answer: D
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Besides Darwin, the theory of evolution by means of natural selection was also independently proposed by:
A. Charles Lyell. B. Karl Popper. C. Thomas Malthus. D. Peter Raven. E. Alfred Wallace.
Protein synthesis in eukaryotes is similar to the process in prokaryotes in that both eukaryotes and prokaryotes
A) have exons. B) have introns. C) require snRNPS. D) use methionine as the "start" amino acid. E) use codons to determine polypeptide sequences.
What is the difference between whole-chromosome aberrations and point mutations?
A) Point mutations affect a single base pair in the genome; aberrations affect a large section. B) Aberrations are not permanent changes in the DNA; point mutations are permanent. C) Point mutations are not permanent changes in the DNA; aberrations are permanent. D) Point mutations are the loss of parts of chromosomes; aberrations are the loss of whole chromosomes.
Individuals with asthma should exercise in cold weather whenever possible.
a. true b. false