How are the two strands in DNA's double helix held to each other?
a. by hydrophobic interactions
b. by hydrogen bonds
c. by ionic bonds
d. by phosphodiester bonds
Ans: b. by hydrogen bonds
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An organism described as oxidase-positive, (K/NC) on TSI media, growth at 42°C, and produces a bright bluish-green pigment on Mueller-Hinton agar is most likely:
a. P. aeruginosa. b. Pseudomonas fluorescens c. B. cepacia d. B. mallei.
Primary production is generally highest in
A. tundra. B. desert. C. wetlands. D. tropical rain forests. E. tropical oceans.
As bones age in older persons, they
a. have increased calcium deposits. b. become stronger. c. are less porous. d. are more brittle. e. increase in length.
________ occurs when allele frequencies within a population change randomly because of chance alone
Fill in the blank(s) with correct word