Maintenance of the resting membrane potential is accomplished by:
a. saltatory conduction down the axon.
b. an excess of calcium ions outside the myelin sheath.
c. an accumulation of more positive ions outside the neuron than inside.
d. the voltage-gated potassium ion channels.
e. the storage of acetylcholine in the nerve terminal.
C
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a. I and II b. I and III c. I and IV d. II and IV e. III and IV
Which of the following statements is a hypothesis rather than a theory?
A) Living things are made of cells. B) Female birds prefer to mate with male birds that have longer tails. C) Modern organisms descended from preexisting life-forms. D) Matter is composed of atoms.
If DNA of a particular species was analyzed and it was found that it contains 27 percent of adenine (A), what would be the percentage of cytosine (C)?
a. 27 percent b. 30 percent c. 23 percent d. 54 percent
Name the substance that serves as the hereditary material in eukaryotes and prokaryotes
A) DNA or deoxyribonucleic acid B) protein C) lipid D) RNA or ribonucleic acid E) carbohydrate