Quality control should be performed on which two organisms to determine the validity of deoxyribonuclease (DNase) media?
a. M. atlantae and M. lacunata
b. M. lacunata and M. lincolnii
c. M. nonliquefaciens and M. canis
d. M. osloensis and M. lacunata
C
M. nonliquefaciens and M. canis are the only two organisms that are negative and positive, re-spectively, for DNase activity. All other organisms listed are DNase-negative.
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The Cyanobacteria are united by their ________, but their ________ is very diverse
A) physiology / morphology B) morphology / physiology C) ecology / physiology D) SSU rRNA sequences / physiology
The enzyme that catalyzes the addition of new nucleotides to a growing DNA strand is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
Four of the five answers are features of the echinoderms. Select the exception
a. spiny skin b. decentralized nervous system c. radial symmetry d. a water-vascular system e. a mantle
The condition known as microbial antagonism may be defined as
A) microorganisms that remain with a person throughout life. B) a relationship between two organisms where one member harms the other. C) a relationship between two organisms where only one member benefits. D) an unsuccessful microbial invasion due to the presence of preexisting microbes. E) a relationship between two organisms where both members benefit.