Which of the following are found within the monomer unit of DNA?
A. fatty acids, sugars
B. phosphate, amino acids
C. phosphate, nitrogen bases
D. nitrogen bases, fatty acid
E. amino acids, nitrogen bases
Answer: C
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Each amino acid has a different side chain, called a(n) ____
a. amino strand b. carboxyl group c. R group d. glucose pentose configuration e. ribosomal attachment
During the process of diffusion, solutes move ________ their concentration gradient.
a. down b. up c. across d. the solutes do not move during diffusion
The major reservoir of phosphorus is ____
a. sedimentary rock b. plant material c. groundwater d. the atmosphere e. ocean water
Which of the following likely reflects the presence of one or more gene mutations?
A. The bacteria that cause gonorrhea, a common sexually transmitted disease, have previously been killed by penicillin; however, after continuous usage of the antibiotic, penicillin-resistant strains are now becoming prevalent. B. Radiation causes an alteration in a DNA nucleotide sequence, which is discovered when mapped, but which appears to be neither increasing nor decreasing in successive generations. C. Fruit flies subjected to intense radiation produce a wider array of variable offspring. D. A chemical leaking from the surface of an old abandoned coal mine alters a regulatory gene so that a cricket nymph develops an extra set of eyes. E. All of the choices are correct.