what does clonal de-selection (deletion) do?
What will be an ideal response?
prevents autoimmunity by the physical elimination of lymphocytes in the thymus
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Celiac disease is a condition in which the lining of the small intestine is damaged. Which of
the following is most affected by this disease?
a. villi b. gallbladder c. bile secretion d. salivary glands
Which of the following has been correlated
with the ability of rats to cope with stress as adults? a. A nurturing mother. b. The number of siblings they have. c. The temperature they are raised in. d. The altitude they are born at. e. All of these.
A normal muscle cell produces the myosin protein, which allows muscles to contract. You discover a single muscle cell that has tRNAs that do not bind to amino acids. Will the myosin gene be expressed in this muscle cell? Why or why not?
A) yes, because all cells in the body express the myosin gene all of the time B) no, because if the tRNAs do not bind amino acids, then translation cannot occur C) yes, because the myosin gene will be transcribed in the muscle cell nucleus D) no, because the myosin mRNA will likely get broken down in the cytoplasm
Most mammals, most cartilaginous fish, some amphibians, and a few reptiles have young developing within the female and obtaining nutrients from her blood, a relationship known as ________.
Fill in the blank(s) with the appropriate word(s).