A scolex is:
a. the anterior attachment organ of a tapeworm
b. the feeding organ of a fluke
c. an appendage of a sandworm
d. the egg of a sea star
e. the larva of an aquatic insect
a
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The tissue located between the cortex and the vascular cylinder in a root is called the
a. endodermis. b. epidermis. c. meristem. d. parenchyma
Which statement best describes why an individual's antibodies and T cells do not attack their own cells?
A) Opsonins keep leukocytes from binding to the B and T cells B) B and T cells mature in the bone marrow and thymus; their antigen receptors are, in effect, tested for their potential to recognize and react against self. C) B and T cells develop into plasma cells which dissolve automatically into the plasma, thus they are not recognized as foreign. D) Interferons interfere with antibodies trying to attach to the B and T cells E) B and T cells have about 100,000 antigen receptors and so they can match anything in the human body.
An uncharged atom of nitrogen (atomic number = 7) has __________.
a. seven protons and seven neutrons b. seven neutrons c. seven valence electrons d. seven protons and seven electrons e. seven neutrons and seven electrons
Streptococcus pneumoniae can escape phagocytic clearance by which mechanism?
A. Capsule-mediated inhibition of phagocytosis B. Inhibition of phagolysosome fusion C. inhibition of opsonization mediated by protein A D. Lysis of phagosome and replication in cytoplasm E. Replication in fused phagolysosome