_____ is an example of reproductive cloning
a. Somatic cell nuclear transfer (SCNT)
b. Multiple offspring from the same pregnancy
c. Artificial embryo splitting
d. [Somatic cell nuclear transfer (SCNT)] and [Artificial embryo splitting]
e. All of these
D
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Which of the following is NOT true of type I Herpes
simplex? a. It is a DNA virus. b. It has a latent phase in its replication cycle. c. It remains in nerve cells for a time. d. Sunburn or other stress can activate it. e. Once activated it causes a form of skin cancer.
Which of the following statements are fundamental to the clonal-selection theory of how the adaptive immune system functions? I) Each lymphocyte has a unique membrane receptor that recognizes one antigen
II) When the lymphocyte binds an antigen, it is activated and begins dividing to form many identical copies of itself. III) Cloned lymphocytes have slight differences and are selected by the spleen for removal if they do not bind an antigen. IV) Cloned cells descend from an activated lymphocyte and persist even after the pathogen is eliminated. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV
In performing a Gram's staining techniques, the decolorization reagent is
A. A mixture of acetone and alcohol B. A mixture of different alcohols C. A mixture of acid and alcohol D. A mixture of acetone and ether E. none of the above
What is the difference between the heartwood and sapwood of a tree?
A) Heartwood contains xylem, and sapwood contains phloem. B) Sapwood contains xylem, and heartwood contains phloem. C) Heartwood no longer transports water and minerals, and sapwood still conducts xylem sap. D) Heartwood contains old phloem that no longer functions, and sapwood contains functioning phloem.