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.

Biology & Microbiology

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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.

Biology & Microbiology

Genes that modify the expression of other genes show:

A. dominance. B. incomplete dominance. C. recessiveness. D. blending inheritance. E. epistasis.

Biology & Microbiology

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.

Biology & Microbiology

Which one of the following terms applies to the phylum Platyhelminthes?

A. Diploblastic B. Radial symmetry C. Radial cleavage D. Protostome E. Acoelomate

Biology & Microbiology