Which of the following examples would most accurately measure the density of the population being studied?
A) counting the number of prairie dog burrows per hectare
B) counting the number of times a one-kilometer transect is intersected by tracks of red squirrels after a snowfall
C) counting the number of coyote droppings per hectare
D) counting the number of moss plants in one-square-meter quadrants
E) counting the number of zebras from airplane census observations.
Answer: D
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J. A. Milburn and R. P. C. Johnson developed an acoustic method for detecting cavitation in plants. This involves "listening" for characteristic clicks produced during air-bubble formation, using sensitive microphones and amplifiers
In one experiment with the castor bean plant (Ricinus communis), they detached leaves by cutting the petioles and subjected them to various treatments. Which of the following would be LEAST likely to be observed in such an experiment? A) as the leaf is allowed to wilt, recording many clicks that approximately equal the estimated number of vessel elements in the cut petiole B) after increasing transpiration by blowing warm air across the leaf, recording an increased rate of clicking C) after adding water to the cut end of the petiole, recording an increased rate of clicking
What is the difference between a genetically modified organism and a transgenic organism?
A. Nothing; they are the same. B. A transgenic organism carries another organism inside of it, and a genetically modified organism does not. C. A transgenic organism is a genetically modified organism that carries a gene from another species. D. A genetically modified organism is a transgenic organism that carries a gene from another species.
What happens immediately after a signaling molecule binds to an RTK?
a. receptor dimerization b. receptor trimerization c. receptor denaturation d. receptor polymerization e. receptor hydrolysis
The difference between cofactors and coenzymes is that
a. cofactors are not necessary and coenzymes are necessary. b. cofactors can be inorganic or organic, coenzymes are always inorganic. c. cofactors can be inorganic or organic, coenzymes are just another name for organic cofactors. d. cofactors are always vitamins, coenzymes are always ions. e. cofactors help with essential metabolic reactions, coenzymes assist with nonessential metabolic reactions.