Refer to the accompanying figure. The use of antibiotic medium at the end of this process:a
selects against plasmids containing human DNA fragments.
b. selects for plasmids containing particular DNA fragments.
c. selects for bacteria containing plasmids.
d. selects for bacteria lacking plasmids.
e. prevents contamination of the medium.
c
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Meningococcemia is
A. best treated with penicillin G. B. started from a nasopharyngeal infection. C. associated with vascular collapse, hemorrhage, and petechiae. D. caused by a gram-negative diplococcus. E. All of the choices are correct.
An environment that favors individuals with intermediate phenotypes results in what type of selection?
a. gradual b. punctuated c. disruptive d. directional e. stabilizing
The important feature of all cells that react to a
specific hormone is the a. type of blood supply they receive. b. proximity of the endocrine gland. c. presence of an appropriate receptor molecule. d. characteristic of their mitochondrial membrane. e. presence of specific genes responsive to the hormone.
Codons are three-base sequences that specify the addition of a single amino acid. How do eukaryotic codons and prokaryotic codons compare?
A) Prokaryotic codons usually contain different bases than those of eukaryotes. B) Prokaryotic codons usually specify different amino acids than those of eukaryotes. C) The translation of codons is mediated by tRNAs in eukaryotes, but translation requires no intermediate molecules such as tRNAs in prokaryotes. D) Codons are a nearly universal language among all organisms.