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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology