B cells are primarily activated by the activities of ________
a. macrophages
b. platelets
c. helper T cells
d. antigen and complement
d
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Amniocentesis involves
A) prenatal diagnosis of genetic defects in a fetus. B) tests for enzyme and protein deficiencies in a fetus. C) taking a sample of amniotic fluid with a needle. D) analysis for DNA and chromosome defects in a fetus. E) All of these
Two populations that have adapted to similar environmental conditions sometimes have a similar appearance
Indicate whether the statement is true or false
Pairing of homologous chromosomes during meiosis I.
What will be an ideal response?
Once you have had a primary exposure to a specific antigen and encounter this antigen again, you will mount a rapid immune response due to:
A) memory cells. B) antigen-presenting cells. C) cytotoxic T cells. D) antibodies.