Which immune system cells primarily function as antibody producers and originate from stem cells?
a. B lymphocytes
b. T lymphocytes
c. Natural killer cells
d. Neutrophils
A
Produced by B lymphocytes in response to the presence of foreign molecules, immunoglobulins (antibodies) are present in serum and in secretions such as saliva and are the central molecule of the immune response.
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Which yellow-pigmented organism exhibits gliding motility that grows best at 35°C and in conditions with increased carbon dioxide (CO2) but cannot grow in ambient air?
a. Actinobacillus b. Capnocytophaga c. Cardiobacterium d. Kingella
Which of the following plant hormones is associated with the closure of stomata in a plant under water stress?
A. gibberellin B. auxin C. ethylene D. cytokinin E. abscisic acid
The problem that occurred during meiosis in sperm formation was
A) nondisjunction involving a Y chromosome. B) an inversion of the X chromosome, preventing the pairing of sex chromosomes. C) failure of the second meiotic division to take place. D) formation of diploid sperm.
What is the purpose and general process of class switching of immunoglobulin genes?
What will be an ideal response?