By analogy, the orbitals and atomic nucleus may be
said to most resemble
a. a merry-go-round.
b. a sundial.
c. a multilevel apartment building.
d. a nest of mixing bowls.
e. ripples in a pond.
Answer: c
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In the roundworm Caenorhabditis elegans, development of the vulva begins when the ____ secretes ____, which then bind(s) to _____ on the _____
A. progenitor cell; EGF; the EGF receptor; anchor cell B. progenitor cell; transcription factors; cisregulatory regions; anchor cell C. anchor cell; EGF; the EGF receptor; progenitor cell D. anchor cell; transcription factors; cisregulatory regions; progenitor cell E. Type 1 cell; EGF; the EGF receptor; Type 2 cell
Which of the following statements most accurately describes the anatomy of a multicellular fungus?
A. Numerous hyphae make up a mycelium. B. Numerous mycelia make up a hypha. C. Numerous mycelia make up a fruiting body. D. Numerous fruiting bodies make up a mycelium. E. Numerous septa make up a hypha.
What stops the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential?
A. Closing of the voltage-gated Na+ channel activation gate. B. Closing of the voltage-gated Na+ channel inactivation gate. C. Opening of the voltage-gated K+ channel gate. D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate. E. Both opening of the K+ channel gate and closing of the Na+ channel activation gate.
When comparing gene regulation in prokaryotes and eukaryotes,
a. both significantly remodel chromatin b. both have transcription and translation in separate cellular compartments c. both produce differentiated cells d. both use transcription control e. both have alternative splicing