What contributes to antigenic shift in influenza viruses?
A) worldwide distribution of the virus
B) a segmented genome
C) attachment spikes
D) ease of virus transmission
E) different virus subtypes
B
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How does the body respond when it first encounters a foreign particle or bacterial pathogen?
What will be an ideal response?
What is the number of chromosomes found in
an oak tree?
a. 2 b. 4 c. 8 d. 12 e. 24
Most populations tend to
A. produce only the number of offspring needed for replacement. B. produce many more offspring than needed for replacement. C. have more females than males. D. have more males than females.
Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl2 different from the bond in KCl?
A. Cl2 is ionic and KCl is covalent. B. Cl2 is covalent and KCl is ionic. C. Cl2 and KCl are both ionic.