Which of the following statements regarding water flow in vascular plants is false?
A. Water flow through xylem conduits is
directly proportional to diameter.
B. Flow rate is proportional to the radius of
the conduit raised to the fourth power.
C. Vessels are much longer and wider than
tracheids, thus their rate of water transport is
much lower than that of tracheids due to
increased resistance.
D. The rate at which water moves in plants is
a function of the number of conduits and their
size.
E. Water must cross pits to cross from one
cell to another, adding resistance to flow.
C
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If you have a double stranded synthetic piece of DNA that you want to attach to a PCR product, which enzyme would be used to join together two molecules.
A. DNA polymerase. B. Reverse transcriptase. C. Restriction enzyme. D. Taq DNA polymerase. E. DNA ligase.
A(n) __________ property is a characteristic of a
system that does not appear in any of its component parts. a. efferent b. emergent c. elective d. energetic e. living
Transmission genetics studies the pattern of ____________________ as traits are passed from generation to
generation. Fill in the blank(s) with the appropriate word(s).
A phylogenetic event horizon is:
a. a point in the future in which species will diversify. b. a phylogeny based on extinct species. c. the point at which life started. d. a point in the history of life beyond which phylogenetic analysis cannot see.