An antigenic ________ occurs when there is a minor change in antigenicity caused by small mutations in a single influenza virus strain.
Fill in the blank(s) with the appropriate word(s).
Drift
You might also like to view...
Eukaryotic chromatin can be described in topological terms as a series of:
A. constrained segments. B. constrained loops. C. relaxed linear segments. D. relaxed loops. E. plectonemic supercoils.
The major class(es) of antibiotics that inhibit protein synthesis is/are
A. aminoglycosides. B. tetracyclines. C. macrolides. D. bacitracins. E. aminoglycosides, tetracyclines, AND macrolides.
All amphibians, reptiles, birds, and mammals alive
today a. have jaws. b. are chordates. c. are vertebrates. d. are craniates. e. are craniate, vertebrate chordates with jaws.
Consider the ringlike patterns on an earthworm and "six-pack abs" in humans. In an animal's body plan, what are they both evidence of?
a. radial symmetry b. cleavage c. segmentation d. mesenteries