Which of the following is a parasitic worm that lives in the human rectum and moves out to the anus to lay eggs resulting in severe itching?
a) pinworms
b) flukes
c) Trichinella spiralis
d) filarial worms
e) tapeworms
Answer: a) pinworms
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Which of the following is NOT a public health measure used to control the transmission of disease?
A) sanitary water and waste disposal methods B) immunization C) forced quarantine D) genetic engineering
When preparing vaccines, which of the following is the basis for the most effective and long-lasting immunity?
a. live viruses b. killed viruses c. subunit viruses d. DNA viruses
Vegetarians who rely upon a single type of plant food
A) may become severely dehydrated. B) run the risk of depleting their liver of glycogen. C) are soon unable to produce sufficient quantities of bile. D) may become protein-deficient.
Which of the following describes a mechanism that eukaryotic organisms can employ to alter protein production as an alternative to regulating transcription initiation?
A. Catabolite repression plays a role in the synthesis of proteins that break down alternatives to glucose-if the substrate is not present, the proteins will not be made. B. During times of cell starvation, the second messenger ppGpp destabilizes the DNA open complexes that code for rRNA and tRNA, saving energy by halting protein synthesis. C. RNA molecules within the spliceosome can direct alternative splicing of the primary transcript so that different proteins can be made from the same coding region. D. A phosphorelay signal transduction mechanism directs the repression or induction of certain eukaryotic genes to regulate the protein end-products.