An atom that contains 8 electrons in its outermost energy level is said to be
A. inert.
B. reactive.
C. a cation.
D. a molecule.
A. inert.
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As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. insertion B. transition C. frameshift D. transversion
Which of the following is NOT a characteristic of a type II restriction endonuclease?
A) cleavage product can be either blunt or sticky ended but is always the same for an individual enzyme B) recognizes a specific palindromic site for cleavage C) recognition site length varies among enzymes but is always the same for an individual enzyme D) unable to cleave methylated DNA
Which of the following statements regarding Campylobacter infection is incorrect?
A. It can lead to Guillain-Barre syndrome. B. It can cause acute temporary paralysis. C. Campylobacter burrows into the mucosa of the ileum and multiplies. D. It can last over 2 weeks. E. It is caused by a shiga toxin.
Refer to the accompanying figure. Which cell type is the source of antibodies?
a. A only b. B only c. C only d. D only e. both A and B