The Mesozoic era lasted from about
A. 250 million years ago to 65 million years ago.
B. 500 million years ago to 250 million years ago.
C. 1 billion years ago to 500 million years ago.
D. 65 million years ago to 2 million years ago.
E. 540 million years ago to 250 million years ago.
A. 250 million years ago to 65 million years ago.
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Your friends, who own a large citrus orchard, invited you to have dinner yesterday, and when you arrived, you found they had prepared a veritable feast on their patio. While dining, you discovered that the trees providing shade from the evening sun bore a variety of citrus fruit, including lemons, limes, oranges, and grapefruit – not on separate trees, as you would expect, but rather each of those trees were heavy with two or more types of citrus fruit each. One of your friends, noticing your amazement, laughed and said, “We planted fruit-salad seeds.” Obviously, that’s not the explanation, but how else could they have created their small fruit-salad canopy?
a. Lemons, limes, oranges, and grapefruit are the same fruit grown with exposure to various hormones. b. Pollen from multiple species are able to cross-fertilize, producing multiple unique fruit on each tree. c. Citrus trees are closely related, allowing for scions of multiple species to be grafted together. d. Blending together calluses from related plant species allows for the growth of chimerical plants.
As large tracts of rain forest disappear due to human activities, the region tends to become drier. Why?
What will be an ideal response?
When bacterial cells participate in conjugation, the bridge between the cells through which the DNA passes is
A. a pilus. B. made of lipopolysaccharide. C. a flagella. D. a capsule. E. made of peptidoglycan.
Which of the following statements is predicted if a population of fruit flies were fed a chemical that blocked the function of the SXL protein?
A) The progeny in the next generation would be approximately 50% male and 50% female. B) The mRNA produced from the doublesex (dsx) gene would not be spliced. C) The progeny in the next generation would be predominantly female. D) The progeny in the next generation would be predominantly male. E) The transformer (tra) gene would be maximally expressed.