How is a mutation distinguished from the broader concept of "DNA damage"?
a. DNA damage occurs from chemicals, and mutations are biological mistakes.
b. Mutations are always heritable.
c. Mutations are always lethal; DNA damage is lethal only sometimes.
d. All of the above are true.
Answer: B
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Portable UV room sterilizing units are being used to reduce endospores of Clostridum difficile in patient hospital rooms after patients have vacated the room. Which of the statements best describes this application?
A. UV radiation will destroy C. difficile endospores and penetrates well to all locations within the room. B. UV radiation will not destroy C. difficile endospores. C. UV radiation will destroy C. difficile endospores and has residual sporicidal effects that will persist after the unit has been removed from the patient's room. D. UV radiation will destroy C. difficile endospores assuming it is applied for a long enough period and directly contacts all surfaces.
All of the following are examples of nonmuscle motility and contractility except
A) microsome formation. B) pseudopodia formation. C) cytoplasmic streaming. D) actin polymerization of Listeria. E) phagocytosis.
The concept of nuclear equivalence states that:a
all of the somatic cells in an adult organism have the same genes. b. the genes of the individuals of the same species are exactly the same. c. as cells mature, unneeded genes are lost. d. the nuclei of all organisms are the same. e. nuclei of individuals of the same species are the same size.
The trait of ________ is known to be controlled through polygenic inheritance.
Fill in the blank(s) with the appropriate word(s).