Which of the following will stimulate a B cell to divide and produce antibodies?
a. binding a foreign antigen to its surface receptors
b. phagocytosis of a foreign antigen
c. stimulation by complement
d. signals released from damaged mucosa
e. uptake of bacterial toxins
A; Binding of antigen to the surface receptor of B cells causes them to divide rapidly to a clone of cells that can secrete quantities of antibody to the antigen. Other cells will phagocytize the resulting debris (choice b).
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The main difference between therapeutic cloning and reproductive cloning is that
A. in therapeutic cloning, embryonic stem cells are extracted from the blastocyst, while in reproductive cloning, the blastocyst is kept intact and implanted into a surrogate mother. B. somatic cell nuclear transfer is used for therapeutic cloning, while gametic cell nuclear transfer is used in reproductive cloning. C. unlike cells used for reproductive cloning, cells grown for therapeutic purposes do not display genetic imprinting problems. D. unlike cells used for reproductive cloning, cells grown for therapeutic purposes do not require the destruction of embryos.
Which of the following is the closest living
relative to a bird?
a. lizards b. alligators c. bats d. dinosaurs e. winged insects
The correct sequence of stages in mitosis is
a. interphase, prophase, metaphase, anaphase, telophase. b. prophase, metaphase, anaphase, telophase. c. metaphase, anaphase, prophase, telophase. d. prophase, telophase, anaphase, interphase.
Buford is a very successful high school athlete who has been diagnosed with diabetes. He needs to do well in sports so that he can receive a university scholarship
He dreams of getting into the pros, too — his whole family is counting on him! However, he doesn't want to go through the entire regimen his doctor has prescribed for him because he thinks it cuts into his sports time. What do you need to tell him about sticking to his diabetic treatment plan?