When human cells are grown under laboratory conditions that encourage them to grow and divide, cells
from human embryos stop dividing after about 50 divisions.
from children divide more quickly than those of adults.
lose their DNA.
continue to reproduce themselves forever.
from human embryos stop dividing after about 50 divisions.
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Most newborns are given the Apgar Test at one minute and
A) five minutes. B) ten minutes. C) thirty minutes. D) one hour.
Why do adults become more susceptible to disease as they age?
A) Fewer antibodies are produced and T cells become less efficient. B) More B cells and T cells are produced than can be absorbed by the bone marrow and the thymus gland. C) The thymus gland and the bone marrow produce antibodies that attack normal body cells. D) The thymus gland becomes excessively large and interferes with the production of B cells.