Red bone marrow, which produces red blood cells, white blood cells, and platelets, is located in
A) ligaments. B) spongy bone. C) compact bone. D) cartilage.
B
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Which of the following protein classes are not found as membrane proteins?
A. transport channels B. hormones C. receptors D. enzymes E. identity markers
What is found in the central cavity of an adult long bone?
a. red marrow b. yellow marrow c. calcium deposits d. collagen e. spongy bone tissue
DNA polymerase
a. is an enzyme. b. adds new nucleotides to a strand. c. proofreads DNA strands to see that they are correct. d. derives energy from free nucleotides for strand assembly. e. is all of these
Answer the following statements true (T) or false (F)
1.A graded potential allows for variable, rather than all-or-none responses, in neurons. 2.During an action potential, sodium ions pour into the cell. 3.The purpose of the nodes of Ranvier is to start nerve impulses. 4.A nerve impulse does not spread backwards because of a refractory period in which the membrane reestablishes its resting potential and cannot generate another action potential. 5.The reason that we can tell light from sound is because different neurons transmit different stimuli.