The main antibody present during the primary immune response is____
a. IgE
b. IgA
c. IgD
d. IgG
e. IgM
ANSWER: e
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In an antibody molecule, the ________ region mediates binding to host cells.
Fill in the blank(s) with the appropriate word(s).
The situation in which an embryo produced as a
result of a mating between individuals of different species is incompatible with the mother and is subsequently aborted is an example of a. temporal isolation. b. hybrid inviability. c. mechanical isolation. d. gametic mortality. e. behavioral isolation.
A large molecule whose subunits consist of a sugar and a nitrogenous base is called a ____
a. nucleoside
b. nucleotide
c. nucleic acid
d. nucleosome
e. nuclear unit
________ is the primary germ layer that forms the nervous system and the outer layer of skin and its derivatives, such as hair, nails, oil glands, sweat glands, and mammary glands
Fill in the blank(s) with correct word