Wilkins and Franklin studied the structure of DNA using ____
a. molecular scale models of nucleotides
b. X-ray diffraction
c. computer-assisted graphics
d. electron microscopy
e. light microscopy
B
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If you were asked to build a model of a nucleotide, what structures would you need to represent in the model?
_____ Ribose sugar. _____ Five carbon sugar. _____ Phosphate group. _____ Methyl group. _____ Base. _____ Codon.
The large intestine
a. contains bacteria that makes vitamins we need. b. absorbs water that was not absorbed by the small intestine. c. concentrates indigestible material into feces. d. absorbs water that was not absorbed by the small intestine and concentrates indigestible material into feces. e. does all of these
Refer to the accompanying figure. How would the survivorship curve for elephants be represented?
a. The curve A
b. The curve B
c. The curve C
d. Either A or C, depending on the species
e. Elephant populations would be better represented by a curve falling between A and B.
With regard to nutrient pollution in aquatic ecosystems, when is the worst time to apply fertilizer to your lawn?
A) when it is raining, or is about to rain B) when it is cold, or is about to get cold C) at the same time you apply pesticides D) at night