The depolarization of the heart is initiated by the
A. left and right bundle branches.
B. bundle of HIS.
C. atrioventricular node.
D. Purkinje fibers.
E. sinoatrial node.
E. sinoatrial node.
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Which of the following is a correct matching of the researcher with their discovery?
A. Pauling provided information on primary structure in biological molecules. B. Franklin suggested that DNA was a helix with more than one strand and that there were about 10 bases per turn of the DNA C. Watson and Crick collected a large amount of X-ray data on the structure of DNA. D. Chargaff demonstrated that the adenine and cytosine bases and the uracil and guanine bases interacted in some manner.
In skeletal muscle, an action potential leads directly to ________
a. the binding of actin with myosin b. the detachment of troponin from actin c. flexure of the already bound myosin heads d. the release of calcium from the sarcoplasmic reticulum
What is a cloning vector?
A. an agent, such as a plasmid, used to transfer DNA from an in vitro solution into a living cell B. the sticky end of a DNA fragment C. the laboratory apparatus used to clone genes D. a DNA probe used to locate a particular gene in the genome E. the enzyme that cuts DNA into restriction fragments
Monocots include plants such as
A. corn, wheat, lilies, orchids, and palms. B. mosses, ferns, algae, and liverworts. C. roses, clover, tomatoes, oaks, and daisies. D. cycads, ginkgoes, pines, and firs.