Which concept represents the highest degree of certainty?
A. Hypothesis
B. Deduction
C. Assumption
D. Theory
E. Prediction
Answer: D
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Your friends, who own a large citrus orchard, invited you to have dinner yesterday, and when you arrived, you found they had prepared a veritable feast on their patio. While dining, you discovered that the trees providing shade from the evening sun bore a variety of citrus fruit, including lemons, limes, oranges, and grapefruit – not on separate trees, as you would expect, but rather each of those trees were heavy with two or more types of citrus fruit each. One of your friends, noticing your amazement, laughed and said, “We planted fruit-salad seeds.” Obviously, that’s not the explanation, but how else could they have created their small fruit-salad canopy?
a. Lemons, limes, oranges, and grapefruit are the same fruit grown with exposure to various hormones. b. Pollen from multiple species are able to cross-fertilize, producing multiple unique fruit on each tree. c. Citrus trees are closely related, allowing for scions of multiple species to be grafted together. d. Blending together calluses from related plant species allows for the growth of chimerical plants.
All of the following can be true of cloning vectors
EXCEPT that they a. are plasmids that slip into a host cell. b. are plasmids that accept foreign DNA. c. can be engineered to contain multiple cloning sites. d. are portions of the main bacterial chromosome. e. can be viruses.
The chemical behavior of an atom is determined most directly by the:a
atomic number. b. atomic weight. c. number of neutrons. d. number of energy levels. e. number of valence electrons
Peristalsis refers to waves of muscular contractions Indicate whether the statement is true or false