The greatest diversity of plants and animals is found in
A) chaparrals.
B) northern coniferous forests.
C) savannas.
D) tropical rain forests.
E) temperate deciduous forests.
D
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What is the purpose of ethidium bromide in DNA electrophoresis?
A) To tag DNA fragments so they can be viewed under UV light B) To introduce mutations into the DNA C) To fragment the DNA before separating the pieces by size D) To join fragments of DNA together
Eight of the 20 amino acids found in proteins are essential, and must be supplied by the diet. The globin protein of hemoglobin is roughly 10% valine, one the essential amino acids. If a person has no source of valine and an adequate supply of the other 19 amino acids, then the globin synthesis rate will be _____% of its expected level
a. 95 b. 90 c. 80 d. 10 e. 0
An atom is best described as
A) having a nucleus containing protons and electrons. B) always containing an equal number of protons and neutrons. C) defined by its number of electrons. D) defined by its atomic mass. E) the smallest unit of an element.
The drug RU486, or Mifepristone, functions by _____
A) inhibiting release of gonadotropins from the pituitary B) blocking progesterone receptors in the uterus C) preventing release of the secondary oocyte from the ovary D) reducing sexual interest E) prolonging the endurance of the corpus luteum