Leeches are in the phylum:
A) Annelida.
B) Cnidaria.
C) Mollusca.
D) Platyhelminthes.
E) Nematoda.
Answer: A
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Select the most complete explanation of what the pH scale measures.
A. The acidity of a solvent B. The alkalinity of a solvent C. The concentration of buffers in a solution D. The concentration of hydrogen ions in a solution
Which category of media can be described as containing nutrients that support the growth of the most nonfastidious organisms without giving any particular organism a growth advantage?
a. Enrichment b. Supportive c. Selective d. Differential
A new security technique is the use of
a. fingerprinting. b. iris scanning. c. retinal scanning. d. tooth identification. e. skin pigment scanning.
A general trend in the structure of many biomolecules is
A) that the order and bonding of monomers form the basis for the secondary and tertiary structure of the polymer. B) that they are all soluble in water independent of the size of the polymer. C) that each class of biomolecule forms one type of secondary structure independent of the order of the monomers in the polymer. D) that each class of biomolecule can form either fibrous or globular conformations depending on the chemical conditions inside the cell. E) that four different monomers form the basis for the functional and structural properties of each polymer.