Immersion oil acts to decrease the refraction of light rays.
a. true
b. false
Ans: a. true
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What can be said about Drosophila development?
A. Paternal genes determine the initial course of development after fertilization. B. Zygotic genes determine the initial course of development after fertilization. C. Maternal genes determine the initial course of development after fertilization. D. Syncytial blastoderm genes determine the initial course of development after fertilization.
What part of the DNA molecule is most exposed to the watery environment in the cell?
A) the flat, tightly stacked plates of the nucleotide bases B) the ionically-charged phosphate groups in the "backbone" C) the deoxyribose sugar alcohol groups in the "backbone" D) the hydrogen-bonding links between nucleotides
Thucydides is known as the father of_______________.
Fill in the blank(s) with the appropriate word(s).
Action potentials differ from graded potentials in that __________.
A) action potentials, but not graded potentials, can be triggered by the opening of gated ion channels B) action potentials propagate along an axon away from the cell body, whereas graded potentials propagate toward the cell body C) action potentials are hyperpolarizations, whereas graded potentials are depolarizations D) only action potentials occur at the axon hillock of a neuron E) action potentials are all of the same magnitude