The direct Coombs' test is designed to detect when people have a disease that causes them to
a. have an excessively high fever.
b. quit making antibodies.
c. make too many red blood cells.
d. produce antibodies that bind to their own red blood cells.
Answer: d. produce antibodies that bind to their own red blood cells.
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Regardless of the DNA polymerase used in PCR, such as Taq or Pfu, they all have an inherent inability to perfectly copy the template strand, which means the polymerases themselves occasionally make mutations in the sequences they copy
Indicate whether the statement is true or false.
Experiments with ribbon worms and planaria have shown that
A. it is easy to hybridize the two species in nature. B. Pax6-related genes are not always required for eye regeneration. C. the DNA of each is sufficiently similar that they can be hybridized in a lab setting. D. their eyes are examples of convergent evolution.
The most common cause of liver cancer in the United States is hepatitis ________ virus.
A. A B. B C. C D. D
In populations, adaptation usually arises through
a. natural selection. b. heredity. c. development. d. metabolism. e. responsiveness.