Even if a B cell has recognized and bound an antigen the B cell cannot respond to an infection unless it receives the proper ?permission? signal. Where does the permission signal come from?
a. The brain.XXX
b. A T helper cell.
c. Another B cell.
d. A macrophage.
e. A cytotoxic T cell.
Question 2
Which of the following statements about the immune system is/are correct?
STATEMENTS
(1) a particular MATURE B cell can make 1011 different kinds of antibodies.
(2) a particular MATURE B cell can make only one kind of antibody.
(3) there are about 1011 different kinds of MATURE B cells.
(4) a single IMMATURE B cell can potentially develop into any one of 1011 different MATURE B cells.
(5) if a normal person is exposed to the same antigen several times, only those immune cells having a receptor for that antigen can respond.
CHOICES
Choose one answer.
a. Statements 1 and 3 are correct. XXX
b. Statements 2 and 3 are correct.
c. Statements 2, 3, and 5 are correct.
d. Statements 1, 3, 4, and 5 are correct.
e. Statements 2, 3, 4, and 5 are correct.
Question 3
HIV Disease (AIDS) is characterized by an immune system that does not function properly. Which of the following cells is actually attacked by HIV?
Choose one answer.
a. B cells. XXX
b. Cytotoxic T cells.
c. Helper T cells.
d. Macrophages.
e. Red blood cells.
Question 4
Some foods increase plasma cholesterol and thus increase the likelihood of developing atherosclerosis. Other foods decrease the amount of plasma cholesterol. Which of these choices is the healthiest to have in the diet?
Choose one answer.
a. cholesterol XXX
b. saturated fat
c. polyunsaturated AND monounsaturated fat
d. monounsaturated fat and cholesterol
e. trans-unsaturated AND saturated fa
Question 5
Why does having an excessive number of fat cells make it difficult for an adult to stay on a reducing diet?
Choose one answer.
a. As normally sized fat cells get smaller they release an appetite-stimulating hormone. VVVVVV
b. As the number of fat cells becomes less and less the person becomes cold and irritable.
c. As the number of fat cells becomes less and less a mitogenic factor is secreted which results in lots of cell division and excessive loss of energy.
d. As the fat cells become smaller the person?s blood pressure drops to dangerous levels.
e. The loss of triglyceride from fat cells unmasks the taste buds on the tongue and food tastes better than ever!
Question 6
Adult-onset diabetes (type II diabetes) is USUALLY found in ____(I)____ adults who ____(II)____ insulin.
Choose one answer.
a. I: underweight II: do not produce XXX
b. I: underweight II: do not respond to
c. I: overweight II: do not produce
d. I: overweight II: do not respond to
e. I: normal weight II: do not produce