Contains osteocytes surrounded by hard matrix.
Answer: Bone
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Which statement best describes the difference in responses of effector B cells (plasma cells) and cytotoxic T cells?
A) B cells confer active immunity; cytotoxic T cells confer passive immunity. B) B cells kill pathogens directly; cytotoxic T cells kill host cells. C) B cells secrete antibodies against a pathogen; cytotoxic T cells kill pathogen-infected host cells. D) B cells carry out the cell-mediated response; cytotoxic T cells carry out the humoral response. E) B cells respond the first time a pathogen is present; cytotoxic T cells respond subsequent times.
Experiments have shown that increased nitrogen may affect the community composition of ____ fungi
a. mycorrhizal fungi alone b. club fungi alone c. saprobic fungi alone d. both mycorrhizal and club e. both mycorrhizal and saprobic
All mammals ________.
A. are ectothermic B. have mammary glands and hair C. are nocturnal D. give birth to live young
List, in order of appearance, all the cell types expected to be formed during oogenesis
A) oogonium, primary oocyte, secondary oocyte and first polar body, ootid and second polar body B) oogonium, primary oocyte, second polar body and ootid, secondary oocyte and first polar body C) primary oocyte, secondary oocyte and first polar body, oogonium, second polar body and ootid D) primary oocyte, secondary oocyte and first polar body, ootid, second polar body, oogonium E) primary oocyte, secondary oocyte and first polar body, second polar body, ootid, oogonium