A marine biologist is conducting research on animals that have a lophophore and two calcified shells. Based on this information, this animal must belong to the phylum
A. Mollusca.
B. Phoronida.
C. Ectoprocta.
D. Bryopoda.
E. Brachiopoda.
E. Brachiopoda.
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Platelets function in _____
a. oxygen transport c. thermal regulation b. hemostasis d. both oxygen transport and hemostasis
An individual's ABO blood type is determined by the presence of particular antigens on the white blood cell surfaces.
a. true b. false
Why is a very low level of body fat unhealthy in young women?
A) Women need a certain amount of fat to maintain their fertility. B) Reduced levels of body fat make a woman unable to expend any energy. C) Women with very low body fat have an increased risk of developing diabetes. D) Women with very low body fat have an increased risk of heavy menstrual bleeding.
Cell communication is critical for the function of both unicellular and multicellular eukaryotes. Which of the following is likely true of cell signaling?
(A) Cell signaling uses the highest molecular weight molecules found in living cells. (B) Cell signaling has largely been replaced by other cell functions in higher mammals. (C) Similar cell signaling pathways in diverse eukaryotes are evidence of conserved evolutionary processes. (D) Cell signaling functions mainly during early developmental stages.