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

Biology & Microbiology

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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.

Biology & Microbiology

________ occurs when allele frequencies within a population change randomly because of chance alone

Fill in the blank(s) with correct word

Biology & Microbiology

Primary production is generally highest in

A. tundra. B. desert. C. wetlands. D. tropical rain forests. E. tropical oceans.

Biology & Microbiology

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.

Biology & Microbiology