What part of the DNA molecule is most exposed to the watery environment in the cell?
A) the flat, tightly stacked plates of the nucleotide bases
B) the ionically-charged phosphate groups in the "backbone"
C) the deoxyribose sugar alcohol groups in the "backbone"
D) the hydrogen-bonding links between nucleotides
Ans: B) the ionically-charged phosphate groups in the "backbone"
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During translation, the nucleotides that make up the mRNA are read in groups of three. These groups are called
A. codons. B. anticodons. C. exons. D. introns. E. templates.
If all of the tertiary consumers were removed from an environment, the associated food web (and thus the carbon cycle) would collapse
A. true B. false
How do ectotherms control their body temperature?
What will be an ideal response?
Ethanol can be easily produced from:a
photosynthetic pigments. b. crystalline cellulose. c. root systems of plants. d. plant sugars. e. all of these.