If one were to propose a new taxon of plants that included all plants that are pollinated by animals, and only plants that are pollinated by animals, then this new taxon would be _____
A) monophyletic
B) paraphyletic
C) polyphyletic
D) identical in composition to the phylum Anthophyta
C
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In DNA molecules,
A. cytosine pairs with adenine. B. thymine pairs with uracil. C. adenine pairs with uracil. D. adenine pairs with thymine. E. cytosine pairs with thymine.
What is the main difference between habituation and conditioning?
A. Habituation involves genetic imprinting, while conditioning involves only learned behavior. B. Habituation lacks an external stimulus, while conditioning involves both external and internal stimuli. C. Habituation involves a stimulus with no association, while conditioning involves a stimulus with an association. D. Habituation involves an increase in the intensity of response, while conditioning involves a decrease in intensity of response. E. Habituation involves learning, while conditioning does not.
Four of the following statements about fossils found on the island of Flores are true. Which one is the exception?
A. They are shorter than modern humans. B. They have very small brains. C. They are 200,000 years old. D. They have a heavy brow ridge. E. They have been described to be like “hobbits.”
When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. an induced fit B. a great range of possible catalytic activities C. a greater supply of activation energy D. more permanent binding through intimate total contact E. more possible products of the reaction