Parts of the choroid form
(a) the lens.
(b) the ciliary body.
(c) the iris.
(d) both b and c.
(d) both b and c.
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The limit of resolution can best be defined as
A) the distance that an object must be moved to be distinguished from its background. B) the inverse of the wavelength of light; it is greatest for black light. C) the distance that two objects must be apart to be distinguished as separate objects. D) the solvent that must be available to remix a solution. E) the magnification power of a microscope.
Transplanted tissue is rejected by the body if the
A. immune system interprets the tissue to be nonself B. grafted tissue is an autograft C. donor and recipient of the transplant are identical twins D. blood types of donor and recipient are the same E. serum sickness is uncontrolled
The element to which oxygen (O2) binds in a hemoglobin molecule is ___________
A. nitrogen D. potassium B. carbon E. phosphorous C. iron
Imagine an invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this animal practices homeostasis with respect to the salt concentration of its body fluids, its salt concentration will show ________
A) no fluctuations B) slight, continuous fluctuations C) a more concentrated state than the surrounding water at all times D a more diluted state than the surrounding water at all times