Red maples and other wind-pollinated plants invest relatively little in producing ________ but must invest a great deal in producing ________ to achieve good pollination rates
A) floral scents; showy petals
B) showy or scented flowers; massive amounts of pollen
C) pollen; showy or scented flowers
D) seeds; massive amounts of pollen
Answer: B
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Biosynthesis of vitamin K (menaquinone) by ________ spp. inhabiting the ________ of humans is a potentially important mutualistic relationship for human health
A) Bifidobacterium / intestinal tract B) Bifidobacterium / stomach C) Escherichia / intestinal tract D) Escherichia / stomach
The use of plastic film to wrap meat products can result in increased surface growth of microorganisms in part because of exposure to
A. carbon dioxide. B. water. C. oxygen. D. N2, which comprises approximately 78% of gas in the atmosphere.
Meselson and Stahl's experiments showed that DNA replication is
A) dispersive, conservative, and semi-conservative. B) dispersive, but not conservative or semi-conservative. C) semi-conservative, but not dispersive or conservative. D) quasi-conservative, but not dispersive or semi-conservative.
A particular flower can be purple, blue, red, or white. A pure-breeding purple plant is crossed with a pure-breeding white plant and the F1 are then crossed to produce an F2 generation. Which phenotypic ratio in the F2 may indicate that flower color in these plants is controlled by two genes that interact additively?
A) 3:1 B) 1:2:1 C) 9:3:3:1 D) 9:3:4 E) 15:1