The tall ferns that we typically see in the tropics and temperate woodlands are the ________.
A. gametes
B. spores
C. sporophytes
D. gametophytes
Answer: C
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A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (TMV). The cell contents are left in a covered test tube overnight
The next day this mixture is sprayed on tobacco plants. We expect that the plants would _____.A) develop some but not all of the symptoms of the TMV infection B) develop symptoms typically produced by viroids C) develop the typical symptoms of TMV infection D) not show any disease symptoms E) become infected, but the sap from these plants would be unable to infect other plants
Which of the following statements is true regarding the fruits produced by angiosperms? Select all correct choices
A. Fruits ripen in response to ethylene. B. Fruits are typically derived from the wall of the ovary. C. Fruits are typically derived from the seed coat. D. Fruits ripen in response to far red light.
The original source of new alleles is
a. crossing over. b. independent assortment. c. fertilization. d. mutation. e. more than one of these.
Carbon dioxide is a pollutant because it
a. is absorbed by the ocean and converted into insoluble carbonates. b. is utilized when fossil fuel is burned. c. is a waste product of photosynthesis. d. cannot be recycled at a rate equal to its present production. e. is replacing oxygen as the most abundant gas in the air