The embryonic period ends by which week of pregnancy?
a. eighth
b. twelfth
c. sixteenth
d. twentieth
e. twenty-fourth
A
Biology & Microbiology
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T cells interact with the peptide-MHC complex using
A) cytokines. B) granzyme and perforin. C) T-cell receptors. D) the antibodies present on the surface of the cell.
Biology & Microbiology
Hemoglobin is a(n) -rich protein that carries oxygen.
A. calcium B. potassium C. zinc D. phosphorous E. iron
Biology & Microbiology
Which of the following is not a modification of epithelial cells?
a. scales b. mucus-secreting cells c. sensory cells d. an endoskeleton e. poison-secreting cells
Biology & Microbiology
Hemopoiesis begins early in embryonic development in the
A) bone marrow. B) spleen. C) lymphatic organs. D) yolk sac.
Biology & Microbiology