Where do antigen-presenting cells interact with
T cells?
a. the thymus
b. the pituitary gland
c. the lymph nodes
d. the adrenal glands
e. the red bone marrow
C
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As a child, you received the OPV vaccine and its boosters. Now you are going on a mission trip to Pakistan, and the vaccine is recommended by the Centers for Disease Control and Prevention. When you go to the health office for the vaccine, they give you the IPV vaccine. When you ask why you are receiving the IPV rather than the OPV, the personnel explain that
A. IPV is used as a booster only, and OPV is used exclusively for children's first immunization. B. the IPV has fewer active viruses in it than the OPV, so it is safer. C. the IPV is preferred by patients because it can be taken orally. D. there is no possibility of actually developing polio from this vaccine.
Conjugation in most ciliates involves a series of steps that leads to increased genetic diversity. Which one of the following choices is not one of those steps?
A. sexual reproduction B. meiosis of a haploid nucleus C. mitosis of a haploid nucleus D. mitosis of a diploid nucleus E. meiosis of a diploid nucleus
A recessive allele on the X chromosome causes color deficiency. A noncolor-deficient woman (whose father is color deficient) marries a color-deficient man. If they have a son, what is the chance that he will be color deficient?
A) 25% B) 0% C) 100% D) 75% E) 50%
Answer the following questions true (T) or false (F)
1. Like bacteriophage, when an animal cell virus enters a host cell, only the genome enters while the capsid remains outside the cell. 2. Naked viruses usually exit the animal host cell by budding while enveloped viruses exit by lysis. 3. All persistent viral infections occur when the virus integrates into the host cell DNA to form a provirus.