Agar, which is used as a thickening agent in the production of ice cream, comes from
A.) red algae
B.) dinoflagellates
C.) euglenoids
D.) fungi
Ans: A.) red algae
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All amino acids are characterized by
A. an amino group and a peptide bond. B. a carboxyl group and a peptide bond. C. the presence of two R groups. D. an amino group and a carboxyl group. E. none of these.
Body fluids in humans have a high buffering capacity because of
A) the presence of the bicarbonate/carbonic acid buffer system. B) the natural result of water as a solvent. C) hydrogen bonding between water molecules in biological fluids. D) shifts in blood pH that are required to maintain homeostasis.
Bacteria in the genus Mycoplasma and bacteria called L-forms lack cell walls.
Answer the following statement true (T) or false (F)
Which of the following is not a major subdivision of the biosphere?
a) Hydrosphere b) Lithosphere c) Stratosphere d) Atmosphere