Blood for transfusion is frequently tested for HIV by using the
A. complement fixation test.
B.
agglutination test.
C. ELISA method.
D.
Ouchterlony test.
C
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________ is / are able to degrade infecting bacteriophage DNA, thus protecting the host cell.
A. Protection exonucleases B. Restriction endonucleases C. Modification methylases D. Lysozyme
Human Hox genes are in four clusters: HOXA, HOXB, HOXC, and HOXD, for a total of 39 genes. Besides conserving the clustering of genes, evolution has also conserved __________
A) their chromosomal locations B) the order of the genes within them C) their expression along the dorsal-ventral axis D) the mutations to which they give rise E) their bilateral symmetry
A layer of endodermal cells around the vascular cylinder deposits a waterproof band called a(n) __________ in their abutting walls.
Fill in the blank(s) with the appropriate word(s).
Some pathogens have developed mechanisms for responding to the innate phagocytic response. The mechanisms include ALL of the following EXCEPT
a. the ability to grow and persist in phagocytes. b. producing leukocidins that kill phagocytes. c. producing PAMPs (pathogen-associated molecular patterns) on the cell surface. d. making a capsule to prevent adherence of a phagocyte.