For the successful development of a vaccine to be used against a pathogen, it is necessary that _____
A) the surface antigens of the pathogen stay the same
B) all of the surface antigens on the pathogen be identified
C) the pathogen has only one epitope
D) the major histocompatability (MHC) molecules are heterozygous
A
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The hormone that controls the concentration of urine is:
a. insulin b. glucagon c. antidiuretic hormone d. thyroxine e. epinephrine
Which type of mutation results in sickle cell anemia?
a. base-pair substitution b. insertion c. deletion d. frame-shift e. gene duplication
The organism in Figure 32-1 is a representative of:
a. the phylum Hemichordata.
b. the phylum Echinodermata.
c. the phylum Chordata.
d. the subphylum Urochordata.
e. the subphylum Cephalochordata
Which statement about endochondral bone development is true?
a. Ossification begins in the diaphysis and later occurs in the epiphyses. b. Bones develop from a noncartilage connective tissue scaffold. c. Most bones of the skull undergo endochondral bone development. d. Only the periosteum undergoes endochondral bone development. e. Osteoclasts are the bone-building cells of endochondral bone development.