Chemicals in tobacco smoke can cause _____
a. DNA to break into pieces.
b. mispairing of bases.
c. kinking in the DNA molecule.
d. the formation of nucleotide dimers.
e. covalent bonding between adjacent adenine bases.
ANSWER: b
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Which of the following statements about DNA is (are) true?
A) DNA contains thymine but not uracil. B) DNA molecules contain deoxyribose. C) In a double-stranded DNA molecule, adenine on one strand will be connected to thymine on the complementary strand by two hydrogen bonds. D) All of the above statements are true.
A(n) ____ character is a trait that has evolved relatively recently
a. derived b. ancestral c. cladistic d. homologous e. polyphyletic
The introduction of a few individuals into a new habitat that is unoccupied by other members of the species is a(n)
A) temporal isolation. B) founder event. C) adaptive radiation. D) limited speciation. E) extinction.
Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?
A) Not all soils have high concentrations of ions. B) Root pressure requires movement of water into the xylem from surrounding cells in the roots. C) Over long distances, the force of root pressure is not enough to overcome the force of gravity. D) There is no water potential gradient between roots and shoots.