Secretory IgA antibodies are unique because they
A. have unique light chains.
B. are Y-shaped molecules.
C. are present in the plasma.
D. are connected with J chains and short polypeptides to form dimers.
E. are present in lymph nodes.
Answer: D
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All of the following are helminths except ________.
A. trypanosomes B. tapeworms C. flukes D. roundworms E. pinworms
Interspecific hybrids differ from intraspecific hybrids in that
A. interspecific hybrids are common and intraspecific hybrids are rare. B. interspecific hybrids are fertile and intraspecific hybrids are not. C. interspecific hybrids can introduce new genetic material to a population and intraspecific hybrids cannot. D. None of the choices is correct.
Which of the following represents the proper order of events in embryonic development?
A. fertilization, gastrulation, neurulation, cleavage, organogenesis B. fertilization, cleavage, gastrulation, organogenesis, neurulation C. fertilization, cleavage, gastrulation, neurulation, organogenesis D. fertilization, gastrulation, cleavage, neurulation, organogenesis E. fertilization, gastrulation, cleavage, organogenesis, neurulation
Parental care requires time and energy that an individual could otherwise invest in reproducing again. What determines how much parental care is given?
What will be an ideal response?