Viruses can be visualized using which method?
A) compound light microscope
B) electron microscope
C) the naked eye
D) ultraviolet rays
Ans: B) electron microscope
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The explanation for the differences between a
human liver cell and a cell from the skin is the a. maternal and paternal origins of the genes. b. gene content of the two cells. c. expression of the genes in the two cells. d. fact that they originated from different primary tissue layers. e. different functions of the cells.
Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus
In which stage of the cell cycle did the nucleus contain 6 picograms of DNA? A) G1 B) S C) G2 D) M
Which of the following is NOT an example of a continuous variable?
A. Time B. Plant growth rate C. Distance D. Shape
Scientists have confirmed by carbon dating that seeds dormant for up to 2000 years can successfully germinate. Based on the requirements for germination, what research expedition should you join in order to retrieve some ancient but viable seeds?
A. A trip to the Irish marsh, where wet peat creates anaerobic conditions, and your colleagues hope to unearth a bog mummy. B. A trip to the arid Dead Sea region, where your historian colleagues have found a storeroom of wax-sealed jars. C. A trip to the Burgess Shale in Canada, where your paleontologist colleagues have found fossils from the Cambrian era. D. A trip to Indonesia, where the civet cat eats and expels coffee beans, producing a gourmet coffee known as Kopi Luwak.