You are doing research on a bacterial species, trying to determine the nature and structure of a number of intracellular inclusions. Which type of microscopy would provide the best view of these intracellular structures?
A. transmission electron microscopy
B. dark-Field microscopy
C. bright-field microscopy
D. scanning electron microscopy
Answer: A
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Which of the following statements best describes DNA polymerase?
A. It is an enzyme required to produce a primer needed for DNA replication. B. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. C. It is an enzyme that catalyzes the addition of nucleotides to the 3? end of a growing DNA strand. D. It is an enzyme required to glue pieces of DNA fragments together. E. It is an enzyme that polymerizes the DNA and keeps the replication fork open.
Which of the following is a function of the thymus?
a) production of red blood cells b) secretion of antibodies c) production and maintenance of stem cells d) site for the maturation of lymphocytes
Which of the following definitions is INCORRECT?
A) endemic: a disease that is constantly present in a population B) epidemic: a disease that is endemic across the world C) pandemic: a disease that affects a large number of people in the world in a short time D) sporadic: a disease that affects a population occasionally E) incidence: number of new cases of a disease
All of the following are advantages of attenuated vaccines over inactivated vaccines exceptÂ
A. they confer longer lasting protection. B. they require fewer boosters. C. they can be transmitted to other people. D. they require smaller doses. E. they produce infection but not disease.