Enterococci can be described as:
a. able to hydrolyze bile esculin.
b. usually hemolytic.
c. a major cause of pharyngitis.
d. often carrying an antiphagocytic capsule.
A
One characteristic of enterococci that helps identify this organism is its ability to hydrolyze bile esculin.
You might also like to view...
In a simple synapse, neurotransmitter chemicals are received by _____
A) the postsynaptic membrane B) the presynaptic membrane C) axon hillocks D) cell bodies E) ducts on the smooth endoplasmic reticulum
You cut some sheep DNA and some plasmid DNA with the same restriction enzyme. The plasmid contains an AmpR gene and a lacZ gene. You mix together the fragments of sheep DNA and the linearized plasmid. You transform bacteria with your mixture, and plate the bacterial cells on growth media containing the antibiotic ampicillin and X-gal (the substrate of beta-galactosidase). You need to pick some bacterial colonies that contain recombinant plasmids. Which colonies do you choose?
A. any colony; if they grow on the media they are recombinant. B. the white colonies; only cells that contain a recombinant plasmid will be white. C. the blue colonies; any cells containing eukaryotic (sheep) DNA will be blue. D. the large colonies; large colonies are more resistant to the antiobiotic and thus more likely to contain a recombinant plasmid. E. any colony, all colonies will contain plasmids; it requires additional testing to determine if the plasmid is recombinant.
In a segment of DNA, an A base is changed to a C and the error is copied during replication. Under which circumstances is that change considered a mutation? (Select all that apply.)
A) The change alters the phenotype of the organism's offspring. B) The change results in production of a novel protein. C) The change is in a somatic cell, such as a skin cell. D) The change is in a gene, but has no effect on a gene product or phenotype.
When a goose spots an egg outside of its nest, the goose gets out of the nest and rolls the egg back. Once started, a goose continues the egg-retrieval movement all the way back to the nest, even if the egg is taken away during the process. This is called:
a) step-wise reproductive collaboration. b) repeated pattern fixation. c) a fixed action pattern. d) prepared learning. e) supernormal stimulus.