In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total number of
shared electrons in CH4 is ____.
a. 1
b. 2
c. 4
d. 5
e. 8
ANSWER: e
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A scientist measured heritability in yield per acre of a strain of wheat grown on a farm in Eastern Europe and determined that it was 80%. She can therefore conclude that:
A. 80% of variation among individuals when the same strain of wheat is grown in Nebraska will be due to genetic differences. B. 80% of variation among individuals when the same strain of wheat is grown on the same farm the following year will be due to genetic differences. C. when the same strain of wheat is grown on two different farms at the same time, 80% of the average difference in yield per acre will be due to genetic differences among populations. D. All of these choices are correct. E. None of these choices is correct.
Why can corn seeds germinate in total darkness?
A. The seed coating absorbs water. B. Seeds are heterotrophic and can capture nutrients from the soil. C. The endosperm provides the embryo with the nutrition needed during the initial germination stages. D. Soil microbes degrade the seed coating allowing the seed to germinate.
Which of the following is not an amoeba?
A. Entamoeba histolytica B. Cryptosporidium species C. Acanthamoeba species D. Naegleria fowleri
In invertebrates with open circulatory systems, hemolymph is composed of:
A. interstitial fluid. B. plasma plus interstitial fluid. C. plasma plus intracellular fluid. D. plasma.