Which of these species' population growth rate is least affected by the number of males?
a. northern elephant seals
b. trumpeter swans
c. Canadian geese
d. European rabbits
e. Norwegian rats
ANSWER: a
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Which statement regarding fungal reproduction is true?
A. Fungi do not produce spores. B. Fungi can only reproduce sexually. C. Many fungi can reproduce either sexually or asexually. D. All fungi can only reproduce asexually.
Avery and colleagues purified a white substance as the transforming principle. Treating this substance with enzymes that destroyed RNA, protein, or polysaccharides did not affect its ability to transform cells, but enzyme that degrades DNA destroyed the transforming ability. These results suggested that
A) their transforming principle was not entirely pure. B) the transforming principle appeared to be DNA. C) the test for transformation was not accurate. D) a single gene could transform bacterial cells. E) both DNA and proteins are required for transformation.
In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH4 (ammonia) to electrical sparks. A few days later, they found ________________ in their system.
a. cells b. rRNA c. DNA d. tRNA e. amino acids
Seeds were important in the evolutionary success of _____________, because they increased the success (to survive and reproduce) of the plant's offspring.
A. Bryophyte B. Angiosperms C. Pine trees D. Club mosses E. More than one above is correct