In the island biogeography model, species richness is a balance between
A. immigration and extinction.
B. speciation and extinction.
C. inhibition and facilitation.
D. tolerance and inhibition.
E. emigration and speciation.
Answer: A
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a. have regions that bind with inhibitor or activator molecules. b. are associated with important energycarrying nucleotides. c. are not affected by temperature or pH. d. have two active sites. e. have all of these
Taking this exam might have caused your adrenal cortex to produce cortisol, the most common glucocorticoid. Cortisol is usually produced in response to
A) a drop in blood pressure. B) the release of adrenaline. C) increased brain activity. D) stress or anxiety. E) inactivity.
In their 1953 paper on the double-helical structure of DNA, Watson and Crick famously wrote: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material." What did they mean?
A. Sexually reproducing organisms swap their DNA. B. The sugar-phosphate backbone of DNA holds the helix together in a way that allows the genetic information to be copied. C. Each strand in a DNA double helix contains all the information needed to produce a complementary partner strand. D. When a cell divides, each DNA helix is split between the daughter cells.
Plants that grow in ________ areas most likely do not require drying or exposure to cold to break dormancy were it to occur
A) desert B) northern temperate C) arctic D) subtropical or tropical