The transplant of pig bone marrow into a human recipient may overcome the ____________________ triggered by

transplanted pig organs. Fill in the blank(s) with the appropriate word(s).


T cell-mediated rejection

Biology & Microbiology

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Humoral immunity is mostly the function of

A. cytotoxic T cells. B. B cells. C. MHC I. D. complement cells. E. mast cells.

Biology & Microbiology

When pollen from one species lands on the stigma of a flower from another species, the pollen tube typically ____

a. does not develop b. forms, but the sperm cannot penetrate the egg c. forms and grows to the ovary, but then stops d. forms, but the sperm are killed e. forms and the egg is usually fertilized, but the embryo rarely grows

Biology & Microbiology

A cardiac researcher is trying to determine whether a pattern of very high blood cholesterol is genetic in a group of Pennsylvania Dutch

Therefore, the scientist looks through years of medical records plus patterns of marriage through several generations. The investigator is doing a type of hereditary research called ________. A) back crossing B) pedigree analysis C) linkage mapping D) title searching

Biology & Microbiology

Bees may pick up pollen of one species on a certain place on their bodies; if this area does not come into contact with the receptive structures of the flowers of another plant species, the pollen is not transferred. This is an example of

A. ecological isolation. B. temporal isolation. C. geographical isolation. D. mechanical isolation.

Biology & Microbiology