Within an existing population, new alleles arise solely by ________
a. crossing over during meiosis
b. mutation
c. changes in chromosome number or structure
d. independent assortment
b
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For living organisms, which of the following is an important consequence of the first law of thermodynamics?
A) The energy content of an organism is constant. B) The organism ultimately must obtain all of the necessary energy for life from its environment. C) The entropy of an organism decreases with time as the organism grows in complexity. D) Organisms grow by converting energy into organic matter. E) Life does not obey the first law of thermodynamics.
Briefly discuss the complementary functional roles of insulin and glucagon What will be an ideal response?
Healthy corals are brightly colored because they _____
A) secrete colorful pigments to attract mates B) host symbionts with colorful photosynthetic pigments C) build their skeletons from colorful minerals D) secrete colorful pigments to protect themselves from ultraviolet light
Sterilization, in which sperm are surgically prevented from reaching the egg, is accomplished by
A) the rhythm method. B) tubal ligation or vasectomy. C) spermicide. D) mifepristone (RU486).