The transposon "sleeping beauty" is:
A. a transposon from fish that was reactivated by mutation.
B. a transposon from fish that was reactivated by introducing a plasmid that had a functional transposase.
C. an artificially constructed transposon based on sequence comparisons of numerous inactive Tc1/mariner transposons.
D. a retrotransposon of humans.
E. a complex transposon that can move from cell to cell.
C
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Which of the following is true about the synthesis of macromolecules from monomeric subunits?
A. It saves energy B. It saves biosynthetic raw materials C. It saves genetic storage capacity D. All of the choices are correct.
What are the benefits of wetlands?
A) protection from flooding B) storage of drinking water C) increasing rate of water flow to bodies of water D) production of sediment that is useful for fertilizer
A group of single-cell organisms collected from the ocean was brought into the lab for examination. The lab assistant was concerned that the water had become full of toxic waste products and so added clean water to the culture. All of the organisms died,
and when she looked at them under the microscope, all she could see were bits and pieces of them scattered throughout the water. What likely happened? A) She added water that was hypotonic to the culture of organisms, and they ruptured. B) She added seawater to which she had added too much salt, and they ruptured. C) She added water isotonic to the organisms, causing too much water to move in and out of the organisms, and they ruptured. D) She added too little salt to the seawater she added, and the organisms all lost too much water and shriveled up.
Human cells have 46 chromosomes; after mitosis, how many chromosomes will be present in the daughter cells?
A) 46 B) 92 C) 23