Which of the following statements is true about zygotes?
A) The number of chromosomes in a zygote is independent of the number of chromosomes in
the gamete.
B) They have double the number of chromosomes as gametes.
C) They have half the number of chromosomes as gametes.
D) They have the same number of chromosomes as gametes.
B
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Which of the following is not accomplished by a chemical released from activated phagocytes?
a. Decreasing plasma iron so that it is unavailable for bacterial multiplication b. Stimulating histamine release from mast cells c. Stimulating the synthesis of viral-blocking enzymes d. Inducing the development of fever e. Stimulating proliferation of white blood cells
These collagen fibers help to connect ligaments and tendons to the periosteum of the bone.
A. Golgi fibers B. Purkinje fibers C. Endosteal fibers D. Haversian fibers E. Sharpey fibers
Two hydrogen atoms share electrons equally between each other, forming a molecule. What type of bond is this?
A) Nonpolar covalent bond B) Ionic bond C) Hydrogen bond D) Polar covalent bond
Which of the following is not a possible cause of autoimmune disease?
a. reduction in suppressor T cell activity b. prolonged treatment with anti-inflammatory drugs c. exposure of normally inaccessible self-antigens d. modification of normal self-antigens e. exposure to a foreign antigen almost identical structurally to a self-antigen