Which statement about eukaryotic chromosomes is not true?
a. They sometimes consist of two chromatids.
b. They sometimes consist only of a single chromatid.
c. They normally possess a single centromere.
d. They consist only of proteins.
e. During metaphase they are visible under the light microscope.
Answer: d. They consist only of proteins.
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If a person has been prescribed eyeglasses with lenses that shorten the path of light, the correction is for
A. farsightedness. B. nearsightedness. C. astigmatism. D. cross-eyed vision. E. None of the answer choices is correct.
Which of the following can lyse pathogenic cells?
a. interleukins b. interferons c. TNF d. complement e. all of these
The rigid chitinous exoskeleton of an arthropod has all of the following functions except it
A. prevents injury to the animal. B. impedes water loss. C. provides a place for muscle attachment. D. maintains a uniform size for all individuals of that species. E. protects the animal from predators.
Connective tissue is different from epithelial tissue in that connective tissue:
A) is not made up of cells. B) has cells that are usually separated and scattered in an extracellular material. C) has a structure called basement membrane. D) is found only in joints.