Iron
A. is needed to produce hemoglobin.
B. is a plasma coagulation factor.
C. is the binding site for carbon dioxide on the hemoglobin molecule.
D. prevents carbon monoxide from binding to hemoglobin.
E. interferes with the normal function of hemoglobin.
A
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Layers of bony matrix at the outer and inner surfaces of bone and covered by the periosteum and the endosteum are
A) concentric lamellae. B) osteons. C) Haversian systems. D) interstitial lamellae. E) circumferential lamellae.
Gametes are produced by ________.
A) external genitalia. B) sex chromosomes. C) autosomes. D) internal genitalia. E) gonads.
Taste buds
A. can perceive seven basic tastes. B. are replaced approximately every 30 days. C. can only perceive taste if the molecules are in solution. D. can be found covering both the superior and inferior surfaces of the tongue. E. have axons and generate their own action potentials.
Which of the following is a clear gel, with no visible structure of its own, in which the organelles are embedded?
A. Nucleoplasm B. Cytoplasm C. Cytosol D. Ectoplasm E. Protoplasm