Antiphagocytic factors produced by microorganisms include all of the following EXCEPT
A) leukocidins.
B) capsules.
C) erythrocytes.
D) resistance to digestion by white blood cells.
Ans: C) erythrocytes.
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When the F factor is integrated, all Hfr strains have the origin of replication functioning in the same direction
Indicate whether the statement is true or false.
Genes that modify the expression of other genes show:
A. dominance. B. incomplete dominance. C. recessiveness. D. blending inheritance. E. epistasis.
A research student is analyzing the nucleic acid of a virus. He finds that the nucleic acid contains thymine. From this it can be concluded that the nucleic acid
A) contains uracil. B) contains ribose. C) is actually a protein. D) contains glucose. E) is a strand of DNA.
Which one of the following terms applies to the phylum Platyhelminthes?
A. Diploblastic B. Radial symmetry C. Radial cleavage D. Protostome E. Acoelomate