Which of the following is mismatched?
a. cytokinin; promotes cell division
b. abscisic acid; triggers bud and seed dormancy
c. ethylene; breaks dormancy of seeds and buds
d. auxin; involved in phototropism and
gravitropism
e. nitric oxide; involved in plant defense responses
Answer: c
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Dead Artemia cells that have been treated with trypan blue appear
(a) colorless. (b) blue. (c) red. (d) indistinguishable from living treated cells.
Some breeds of dogs that are specialized to retrieve objects from bodies of water have webbing between their toes. A change in what cellular response to positional information during digit formation could account for this morphological feature?
A. Signals that cause differentiation to toes are not received by cells that become webbing. B. Signals to cause apoptosis are not received by cells that become webbing. C. Cells between the future digits migrate, but do not divide once they are in the region that will become toes. D. Cells between the future digits divide, but do not migrate to the region that will become toes. E. Cells between the future digits do not divide before migrating to the region that will become toes.
Over evolutionary time, DNA replaced RNA as the primary molecule holding the code for genetic information because DNA is believed to be more chemically stable. Which attribute of DNA is the reason behind its chemical stability?
a) DNA lacks a free hydroxyl group on the 2?-carbon atom of its sugar. b) Unlike RNA, DNA is usually double-stranded. c) DNA does not usually form hairpin loops. d) One of the two pyrimidines found in DNA does not involve uracil. e) DNA contains thymines, which make it more chemically stable.
Which elements are found in all carbohydrates, lipids, proteins, and nucleic acids?A) nitrogenB) carbonC) hydrogenD) oxygenE) phosphorusF) sulfur
What will be an ideal response?