Sponges from which class have been used as bath sponges?
a. Calcarea
b. Hexactinellida
c. Demospongia
d. Sclerospongiae
c. Demospongia
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Characteristics that are found in the bacteria called Mycobacterium are:
a. a cell wall that contains N-glycolylmuramic acid and has a high lipid content. b. a cell wall that has a low lipid content. c. sensitive to decolorization by acidified alcohol. d. rapid-growers, as compared with most other human pathogenic bacteria.
Sporopollenin is
A. a tough protective covering on spores. B. pollen that is produced in a sporophyte. C. the conversion of pollen to spores. D. a capsule housing pollen. E. food stored in pollen for the growing embryo.
Typically, where would we expect to find older
fossils?
a. superficial layer of the Earth b. deep layer of the Earth c. both layers will have old fossils d. neither layer will have old fossils e. none of these
If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?
A) The cells remain unchanged due to equal solute concentrations inside and outside the cells. B) The cells remain unchanged due to equal water concentrations inside and outside the cells. C) They become white blood cells. D) The cells swell and burst because water moves into them. E) The cells shrivel up because water leaves them.