Plasmids are small, circular, supercoiled DNA molecules found in some bacteria. They usually do not carry essential genes, but some plasmids, such as R (resistance) plasmids, carry genes coding for antibiotic resistance. All plasmids have their own origin of replication, so that they are replicated along with the host chromosome and passed along to progeny cells. Only some plasmids possess genes that allow for transmittal to other bacteria by the process of conjugation.
a. true
b. false
Ans: a. true
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Which of the following is the correct flow of air being inhaled?
a) nasopharynx, oropharynx, laryngopharynx, larynx b) nasopharynx, nasal vestibule, nasal cavity, oropharynx c) nasal vestibule, nasal cavity, nasopharynx, laryngopharynx, oropharynx d) larynx, laryngopharynx, nasopharynx, oropharynxa
The physical basis of life is/are ____________
a. carbon b. water c. carbon and water d. carbon, water, and silicon
Individuals that are heavy smokers may eventually have trouble clearing the mucous from their lungs because the structures that move fluid along the epithelial lining of the lung become damaged over time. What are these structures called?
A. Flagella B. Cell walls C. Cilia D. Pili
Polar, water-soluble hormones usually affect cells by binding to intracellular receptors.
a. true b. false