When growing plants in culture, indoleacetic acid (IAA) is used to stimulate cell enlargement. Which plant growth regulator has to be added next to stimulate cell division?
A) ethylene
B) indoleacetic acid
C) gibberellin
D) cytokinin
E) abscisic acid
Answer: D
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Cells that have the FasL molecule
a. must also possess the Fas protein. b. must be cytotoxic T cells. c. must be melanocytes. d. will attack each other. e. will attack cells that have the Fas protein.
In active transport, what provides the energy needed to move ins or molecules across the membrane?
a. sodium & potassium ions b. calcium ions c. sodium ions alone d. ATP molecules
Which of these statements is CORRECT?
A) Scientific ideas are subjected to repeated testing. B) Science can be used to prove or disprove the idea that deities or spirits cause earthquakes and other natural disasters. C) Science does not require observations that other people can confirm. D) Only discovery science can lead to important conclusions about nature.
If decomposers ceased to exist, you would expect
A. photosynthesis to stop. B. organic matter to build up. C. few changes. D. increased numbers of herbivores.