The percentage of twins being born has increased in the past 20 years because of:
a. the increased use of fertility inducing drugs.
b. increases in hospital care.
c. the desire of more couples to have twins.
d. the increased use of thalidomide.
e. the increased incidence of German measles.
a
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Multiple myeloma is a plasma cell tumor in which a clone of malignant plasma cells produces large amounts of immunoglobulin. With all this excess immunoglobulin, how can a person with multiple myeloma be immunodeficient?
A. All the immunoglobulin produced is most likely specific to one antigen. This limits the ability to respond to the diversity of antigens we encounter. B. The multiplication of the malignant plasma cells may crowd out normal production of other immune cells required for protective responses. C. The massive overproduction of immunoglobulin impairs the kidneys, preventing production of the correct hormones from the kidneys to balance immune system cell production from the bone marrow. D. Through a negative feedback loop, the large amount of immunoglobulin tricks the immune system into thinking it's making a strong response that is needed. As such, it shuts down production of other responses that might truly BE needed to fight off a pathogen. E. All the immunoglobulin produced is most likely specific to one antigen. This limits the ability to respond to the diversity of antigens we encounter AND the multiplication of the malignant plasma cells may crowd out normal production of other immune cells required for protective responses.
A prokaryote that occupies an extremely salty habitat is a(n)
A. basophile. B. thermophile. C. halophile. D. hydrophile. E. acidophile.
DNA polymerase III adds nucleotides ________
A) in the place of the primer RNA after it is removed B) to the 3' end of the RNA primer C) to both ends of the RNA primer D) to internal sites in the DNA template E) to the 5' end of the RNA primer
White blood cells are like red blood cells in that they only live for a matter of days.
Answer the following statement true (T) or false (F)