Who developed the science of taxonomy?
a. Charles Darwin
b. Aristotle
c. Alfred Russel Wallace
d. Sir Isaac Newton
e. Carolus Linnaeus
E
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After the stage IV of the demographic transition, birth rates
A. are lower than death rates. B. equal 2 ? death rates. C. are higher than death rates. D. equal death rates. E. None of these choices are correct.
Which of the following best describes the structure of how water molecules form and interact?
a. Hydrogen atoms bond with each other to create a stable outer shell of electrons. Then they form a hydrogen bond to an oxygen atom to create the water molecule. b. Oxygen atoms transfer one electron to each of the hydrogen atoms, forming an ionic bond that attracts other water molecules to it. c. The oxygen atom and hydrogen atoms form a covalent bond with one another to create stable outer shells of electrons. d. The electrons are shared unequally resulting in a polar molecule whose slight charges form weak hydrogen bond attractions with other water molecules. e. Hydrogen bonds are formed between the two hydrogen atoms and the oxygen atom. This water molecule then forms a covalent bond with adjacent water molecules. f. The oxygen atom is more electronegative than the two hydrogen atoms. Due to this, it removes the electron from each hydrogen atom. This satisfies the outer shell of oxygen. Then hydrogen bonds form between the two remaining hydrogen atoms to hold them near to the oxygen atom.
A particular codon sequence of mRNA is AAA. The anticodon on the tRNA that binds to the mRNA codon is
A. UUU. B. AAA. C. TTT. D. either UAA or TAA, depending on first base wobble. E. UUA.
Reinforcement is most likely to drive the evolution of
A. postzygotic isolating mechanisms, because selection acts after the formation of hybrids. B. prezygotic isolating mechanisms, because selection favors alleles that prevent hybridization. C. prezygotic isolating mechanisms, because selection favors alleles that promote hybridization. D. postzygotic isolating mechanisms, because hybrids have low fitness relative to the parents.