The backbone of the DNA molecule is formed by ________
A. peptide bonds
B. ribose sugars
C. nitrogenous bases
D. phosphodiester bonds
D
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The animal in the photograph above is
a. a heterotherm. b. a endotherm. c. a ectotherm. d. a ectotherm during the day and endotherm at night. e. none of these.
Homeotic genes of Drosophila:a
cause cells of the same type to produce differing amounts of gene products. b. specify the developmental plan(s) for each segment. c. are expressed in only one sex in any particular species. d. are always the sites of lethal mutations. e. control developmental timing.
Which of the following adversely affects the ozone layer?
A. Oil B. Plastics C. Chlorofluorocarbons D. Coal and natural gas E. Greenhouse gases
Only yeast produces alcohol as a fermentation product.
Answer the following statement true (T) or false (F)