An idea that could be traced back to Plato is that
A. worldwide catastrophes caused extinction, followed by creation of new species.
B. acquired characteristics could be passed from parents to offspring.
C. artificial selection of animals by humans proves that evolution can occur.
D. variation is due to imperfections in copies of some perfect ideal form.
E. species could change with time.
Answer: D
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Which of the following would you expect to observe in an in vitro experimental mixture containing microtubules anchored by their minus ends to centrosomes, polystyrene beads with kinesin or dynein motors attached, and ATP?
A) movement of kinesin-attached beads along microtubules away from centrosomes B) movement of dynein-attached beads along microtubules toward from centrosomes C) movement of beads in either direction along a single microtubule D) removal of ATP stopping all bead movement along microtubules E) All would be expected.
In peas, Mendel found that tall plants and yellow peas are dominant. The phenotype for a pea plant with the genotype
TTyy would be: a. intermediate height with greenish-yellow peas. b. short with green peas. c. short with yellow peas. d. tall with green peas. e. tall with yellow peas.
Which type of plant tissue is specialized for conducting fluids?
a. dermal tissue b. meristem c. protoderm d. vascular tissue
The addition of a new deoxynucleotide to a growing DNA chain requires more energy than can be obtained by the hydrolysis of ATP to ADP + Pi
What alternative series of reactions is used, and how does this help overcome the energy barrier for DNA synthesis?