Which of the following statements about joints is false?
A. A hinge joint can be controlled by two
antagonist muscles, whereas ball and socket
joints require at least four sets of muscle
antagonists.
B. The shoulder is the most mobile joint in the
human body.
C. A ball-and-socket joint is less stable than a
hinge joint.
D. Ball-and-socket joints allow motion along
three axes, whereas hinge joints limit motion
to one axis of rotation.
E. The range of motion of a joint is
determined by the shapes of the bone
surfaces that meet at the joint.
A
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A certain female's number 12 chromosomes both have the blue gene and number 19 chromosomes both have the long gene. As cells in her ovaries undergo meiosis, her resulting eggs (ova) may have which of the following?
A) either two number 12 chromosomes with blue genes or two with orange genes B) either two number 19 chromosomes with long genes or two with short genes C) either one blue or one orange gene in addition to either one long or one short gene D) one chromosome 12 with one blue gene and one chromosome 19 with one long gene
Which of the following helps in chromosomal movement during cell division?
a. chloroplasts b. microtubule c. microfilaments d. peroxisomes e. intermediate filaments
Matching. Match each term with the most
appropriate statement. 1. ___ antigens 2. ___ B lymphocytes 3. ___ perforin 4. ___ clone 5. ___ complement proteins 6. ___ cytotoxic T lymphocytes 7. ___ interleukins 8. ___ macrophages 9. ___ memory cells 10. ___ B cells 11. ___ retroviruses 12. ___ stem cells 13. ___ natural killer cells 14. ___ vaccine A. cells that do not divide, die in less than a week, and secrete antibodies B. cells that directly destroy body cells already infected by viral or fungal parasites, as well as mutant and cancerous cells C. lymphocytes that are held in reserve, circulate in the bloodstream, and enable a rapid response to subsequent encounters with the same invader D. able to lyse cells by forming pore complexes Chapter 38 Immunity 441 E. cells that are produced in the bone marrow, are never changed by the thymus, and manufacture antibodies F. able to destroy cells but not dependent on recognition of antigen-MHC complexes G. a class of proteins that help cells of the immune system communicate H. “big eaters” that alert other lymphocytes to the invasion of specific antigens I. immature cells that may or may not be committed to develop into one of several mature cell types J. a group of cells that are all produced asexually from one original parent cell K. surface patterns of nonself molecules or particles L. proteins released by cytotoxic T cells to destroy target cell membranes M. preparation injected into the body to elicit a primary immune response N. one of this group has been identified as the causative agent of AIDS
Please match the description to the pattern of infection.
More severe infection, rapid onset A) Acute infection B) Systemic infection C) Localized infection D) Chronic infection E) Secondary infection