Glycoprotein spikes protruding from the outer surface of viral envelopes function as ________.
A. toxins
B. cell lysis factors
C. factors needed for site specific recombination
D. factors that bind to host cells
Answer: D
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Which of the following is true about the general transcription factors in eukaryotic transcription?
Disease ________ is measured by the total number of new reported disease cases within a population over a period of time
A) incidence B) frequency C) morbidity D) prevalence
An elderly man with chronic heart and lung disease develops Legionella pneumonia. By what route was the infection most likely to have been acquired?
a. Respiratory route, from an infected person b. Inhalation of aerosolized water from a source containing protozoa c. Inhalation of spores from moldy hay d. Exposure to livestock or animal products
Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor gene (FGFR) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. If two people with achondroplasia have a child together, what is the probability that their child will also have achondroplasia?
A) 0 B) 1/2 C) 2/3 D) 3/4 E) 1