True or false: The valence electrons of an atom are at the lowest energy level because their increased distance from the nucleus reduces their attraction to the atom's protons
A. true B. false
Answer: B
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Suppose a living plant cell has ? = ?S = ?0.5 MPa. If the plant cell is placed into a beaker filled with a
solution with ? = 0, then the cell should
a. take up water until it bursts. b. lose water until its ? = ? of the solution. c. take up water until within the cell ?P = ??S. d. take up water until its ?S = ?S of the solution. e. lose water until its ?S = its ?P.
Primary carnivores are
a. primary consumers. b. secondary consumers. c. tertiary consumers. d. primary producers. e. secondary producers.
If there are 64 potential codons that code for various amino acids but only about 20 specific amino acids, what must be true about the genetic code?
A) Most of the codons are not used. B) There are two codons for each amino acid, and the rest are stop codons. C) All are used, but bacteria and plants each have 20 different amino acids. D) Multiple codons code for the same amino acid.
Which of the following is a true statement about body size and physiology?
A) The amount of food and oxygen an animal requires and the amount of heat and waste it produces are inversely proportional to its mass. B) The rate at which an animal uses nutrients and produces waste products is independent of its volume. C) Small and large animals face different physiological challenges because an animal's body mass increases cubically while its surface area increases as a squared function. D) The wastes produced by an animal double as its volume doubles and triple as its surface area triples.