Which statement BEST describes sewage and wastewater?
A) Wastewater is a subset of sewage.
B) Sewage is a subset of wastewater.
C) Wastewater and sewage are virtually synonymous.
D) Wastewater and sewage are both subsets of all liquid effluents from domestic and industrial sources.
Answer: B
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Cell cleavage during embryonic development in ducks is
A. meroblastic. B. holoblastic. C. complete. D. through the entire egg. E. impossible.
All of the following genera are considered resident biota of skin sites except ________.
A. Corynebacterium B. Staphylococcus C. Escherichia D. Micrococcus E. Candida
How does Helicobacter pylori cause stomach ulcers?
A) Fimbriae enable to bacteria to penetrate the mucosa and bind to the epithelial lining of the stomach where toxins are released that bind and destroy epithelial cells. B) The glycocalyx protects the bacteria from stomach acid as the bacteria enters a susceptible host and binds to an area of epithelial cells in the stomach with thin mucosa where toxins cause further damage and allow entry. C) Polar flagella help bacteria burrow into mucosal lining to escape stomach acid, where enzymes decrease the acidity around them, and they release a toxin to kill host cells. D) Peritrichous flagella help the bacteria squeeze through the mucosal lining to avoid stomach acid, where cytokine imposters are released which attract B cells and cause the immune response to destroy the epithelial lining of the stomach. E) Bacterial capsules allow the bacteria to survive in the acidic lumen of the stomach as it releases toxins that bind to and destroy the epithelial lining of the stomach.
Which of the following statements is FALSE?
A) DNA polymerase joins nucleotides in one direction only. B) The leading strand of DNA is made continuously. C) The lagging strand of DNA is started by an RNA primer. D) DNA replication proceeds in one direction around the bacterial chromosome. E) Multiple replication forks are possible on a bacterial chromosome.