Curved, microaerophilic, gram-negative rods, with most species having strong urease activity and the majority of which colonize mammalian stomachs or intestines, describe which group of bacteria?
a. Campylobacter
b. Helicobacter
c. Arcobacter
d. Enterobacter
B
In 1983, spiral-shaped organisms resembling campylobacteria were isolated from the human stomach; these organisms were named Campylobacter pylori. On the basis of many studies, the genus Helicobacter was established in 1989, and C. pylori were renamed Helicobacter pylori. At least 32 species are now included in this genus, the majority of which colonize mammalian sto-machs or intestines. The genus Helicobacter consists mostly of curved, microaerophilic, gram-negative rods, with most species having strong urease activity.
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The chance of a child having albinism when both of his parents are heterozygous for the disorder is ____ percent
a. 0 b. 25 c. 33 d. 50 e. 75
The basis of the immune system is:
a. direct cell to cell contact. b. distinguishing between self and nonself. c. communicating between cells. d. producing antibody action. e. attacking invading objects.
Of the following, which is the last step in the production of a recombinant DNA plasmid?
A) cloning B) using DNA ligase to join DNA fragments C) cutting the gene of interest into fragments D) allowing the reproduction of the bacterium bearing the recombinant plasmid
An organism that lacks a nucleus is called a(n):
A. Prokaryote B. Eukaryote