A random alteration in the sequence of DNA nucleotides that provides a new variant allele is known as a
A. disruption.
B. gene mutation.
C. polymorphism.
D. gene frequency.
Answer: B
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Microbial species are difficult to define because they are often polyphyletic
Indicate whether the statement is true or false.
Most carbon dioxide is carried in blood as ___
which is formed in ___.
a. carbonic acid...the plasma b. the bicarbonate ion...red blood cells c. carbon dioxide...hemoglobin d. carbon dioxide...red blood cells e. the bicarbonate ion...the plasma
Portable UV room sterilizing units are being used to reduce endospores of Clostridioides difficile in hospital rooms after patients have vacated. Which of the statements best describes this application?
A. 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. B. UV radiation will destroy C. difficile endospores and penetrates well to all locations within the room. C. UV radiation will destroy C. difficile endospores assuming it is applied for a long enough period and directly contacts all surfaces. D. UV radiation will not destroy C. difficile endospores.
When chromosomes fail to separate at either the first or second meiotic division, this
a)is known as crossing over. b)results in a sperm or egg cell with an abnormal number of chromosomes. c)is known as translocation. d)results in a failure to produce gametes. e)results in arrest during meiosis.