Which process contributes to prokaryotic genetic variability?
a. binary fission
b. horizontal gene transfer
c. nitrogen fixation
d. mutation
Ans: d. mutation
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What is the name of the process by which carbon sediments on the ocean floor are moved beneath one tectonic plate, and may eventually be released by volcanic activity?
a. sublimation b. infusion c. subduction d. lithification
Consider the events that describe the progress of a protein that will be secreted from the cell.
1. SRP binds to the growing polypeptide chain and to the ribosome. 2. Translation resumes. 3. SRP binds to its receptor. 4. The signal sequence is cleaved. 5. Protein synthesis begins in the cytosol. 6. Translation pauses. Which of the sequences of events correctly describes the progress of a protein that will be secreted from the cell? A) 5 ? 1 ? 6 ? 3 ? 2 ? 4 B) 5 ? 6 ? 1 ? 3 ? 2 ? 4 C) 3 ? 6 ? 1 ? 2 ? 4 ? 5
Which of the following can result when antibiotic therapy disrupts the normal microbiota?
A) anaphylactic shock B) black hairy tongue C) pseudomembranous colitis D) thrush E) both pseudomembranous colitis and thrush
If a mutation occurred in a flatworm such that the flame cells no longer functioned, what do you predict would be the consequence?
A. The parasitic forms could no longer hold onto their host. B. Excretory function would be impaired. C. Digestive function would be impaired. D. Nerve function would be impaired. E. Reproductive function would be impaired.