Gamma irradiation
A. has not been approved for use on food.
B. can be used to either sterilize or pasteurize, depending on the dose of radiation.
C. leaves some radioactive particles in the treated substance.
D.
usually kills by generating heat and denaturing proteins.
B
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Salmon are well known for their ability, after growing to maturity in the ocean, to find their way back to the streams where they were born in order to breed. For this kind of navigation, they likely:
A. use magnetotaxis only. B. use map information only. C. rely on kinesis only. D. use a variety of environmental cues. E. use only a combination of magnetotaxis and kinesis.
In the microarray shown in the textbook, the cDNAs were labeled with red and green fluorescent tags. Why do some
spots on the microarray emit yellow light?
a. Red and green are two of the primary colors, and if both cDNAs hybridize to the spot, the combination of the two will produce yellow light. b. The yellow light comes from the laser, and a yellow spot indicates that neither cDNA hybridized to that spot on the microarray. c. The over expression of one cDNA relative to the other will skew the color pattern of the spot on the microarray, resulting in the yellow color. d. The color choice was an arbitrary decision by the artist and doesn't reflect how the process actually works. e. Yellow spots are those that contain no DNA probes on the chip.
In suggesting alternative hypotheses to explain figure 18.18, your lab partner states that perhaps mosses didn't evolve until recently, which is why they increase after herbs and shrubs. Which of the following would be the best response to your lab partner?
a. Mosses were actually the first land plants to appear b. Mosses are better adapted to dry climates c. All land plants appeared at roughly the same time d. If you look carefully at the graph, there were a few mosses present 300,000 years ago, so they probably arose then e. Mammoths probably ate the mosses, so they did not appear until after the mammoths went extinct
An animal zygote is a(n) haploid cell
__________________ Indicate whether the statement is true or false.