The most reasonable explanation for the fact that disorders such as cystic fibrosis do not disappear
from the human population is that
a. it is an autosomal dominant disease.
b. new medical procedures allow most sufferers to live long enough to pass the gene on to
offspring.
c. heterozygous carriers have one normal gene that masks the harmful gene.
d. the gene keeps mutating back to the harmful form.
e. persons with cystic fibrosis are made stronger by their affliction.
C
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Chemokines are a group of small proteins that
A) attract T cells to sites of injury. B) function as chemoattractants for phagocytes and lymphocytes. C) potentiate specific immune responses. D) attract T cells, phagocytes, and lymphocytes, as well as potentiate specific immune responses.
A close evolutionary relationship between annelids and mollusks is suggested by the presence of a _____ larva in both phyla as well as by molecular sequence comparisons
A. trochophore B. lophophore C. radula D. bivalve E. none of these
Compare and contrast the roles of cell division and morphogenesis in the development of an animal. What will be an ideal response?
The use of metals as terminal electron acceptors is/are known as ________ because the metals are not incorporated into biomass.
A. metallo-neutral B. negative metallic addition C. Fenton reactions D. dissimilatory metal reduction