Answer the following statements true (T) or false (F)
1. Anton van Leeuwenhoek is given credit for developing the first compound light microscope.
2. The wavelength of visible light limits the size of objects that can be seen with the compound light microscope.
3. The resolving power of compound light microscopes can be improved by adding additional magnifying lenses.
4. A brightfield microscope can be converted to a darkfield microscope by replacing the condenser on a brightfield microscope with a darkfield condenser.
5. Primary syphilis is usually diagnosed in the clinical microbiology laboratory by the use of a scanning electron microscope.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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Which of the following statements about RNA processing in eukaryotes is INCORRECT?
A. The excision of introns from pre-mRNA is the only modification required to produce a mature mRNA. B. A protein/RNA complex is used to remove introns from the pre-mRNA. C. A poly A tail is added on to the 3? end of the mRNA. D. A 7-methylguanosine cap is added on to the 5?end of the mRNA. E. Modification occurs in the nucleus.
When individuals have mitochondrial disorders, why are the skeletal and heart muscles and the brain most often affected?
a. They are the most important organs. b. They have the highest energy needs. c. They are generally very fragile. d. They have fewer mitochondria in the cell. e. They are the most complex organs.
A male fish has changed into a female fish. What kind of hermaphroditism occurred?
a. Synchronous b. All of these choices c. Protogyny d. Protandry
Which of the following situations might cause normal microbiota to become opportunistic pathogens?
A) growth of microbes on the surface of intact skin B) growth of microorganisms on the excreted cellular wastes and dead cells in the large intestine C) treatment of a cancer patient with radiation D) growth of Lactobacillus on the surface of teeth E) presence of Entamoeba in the lumen of the colon