Which of the following statements concerning the hepatitis B vaccine is FALSE?
A) It must be given in three doses.
B) It is protective against the virus in 95% of vaccinated individuals.
C) It is recommended for high-risk groups.
D) It must be repeated every five years.
E) Immunity can last at least 20 years and may be for life.
D
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An epitope associates with which part of an antibody?
A) the disulfide bridge B) the heavy-chain constant regions only C) variable regions of a heavy chain and light chain combined D) the light-chain constant regions only E) the tail
The last protein in a signaling pathway is called the ____
a. target protein b. final acceptor c. electron acceptor d. second messenger e. effector protein
Which animal has the simplest known central nervous system?
a. a flatworm b. an arthropod c. a chordate d. a mollusk e. an echinoderm
All of the rickettsias are spread by transovarian transfer
Indicate whether the statement is true or false