A neutral solution
A) is hydrophobic.
B) has a pH of 0.
C) has no H+.
D) has no OH-.
E) has equal amounts of H+ and OH-.
E
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Indicate whether the statement is true or false.
Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Therefore, which of the following can be true?
A) Molybdenum atoms can have between 50 and 58 neutrons. B) Molybdenum atoms can have between 50 and 58 protons. C) Molybdenum atoms can have between 50 and 58 electrons. D) Isotopes of molybdenum have different numbers of electrons.
Why may eating carrots be useful for enhancing vision?
A. High levels of beta-carotene can lead to the production of a pigment used in vision. B. High levels of NADPH in carrots can allow vertebrate eyes to perform the light reactions. C. High levels of chlorophyll in carrots helps with photosynthesis in the eyes. D. High levels of carotenoids in carrots can allow vertebrate eyes to perform the dark reactions.
Which of these definitions of species most closely fits the biological species concept?
A) For asexually reproducing organisms, members of the same species are based on DNA and RNA base sequence analysis. B) Members of the same species can mate and produce fertile offspring. C) Members of the same species are all morphologically similar. D) Members of the same species look almost exactly alike.