Which branch of this phylogenetic tree identifies Archaea?
a. A
b. B
c. C
d. D
e. E
D
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What is the first step during transcription initiation in prokaryotes?
A. the transcription bubble is formed B. RNA polymerase binds to the promoter C. the DNA double helix is unwound D. RNA polymerase synthesizes a short primer E. transcription factors bind to the TATA box sequence
Which ion channel is responsible for the rising phase of the action potential and why?
A. Na+ channels, because positive Na+ ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm B. Na+ channels , because positive Na+ ions are at higher concentration inside the axon than outside, and so they leave the axon and raise Vm C. K+ channels, because positive K+ ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm D. K+ channels, because positive K+ ions are at higher concentration inside the axon than outside and so they leave the axon and lower Vm
You walk down into your basement to find that the carpeting on the floor is damp. Concerned, you look around for large puddles of water or broken pipes, but find none. In fact, only the basement floor and carpeting is damp. You realize that water must have wicked into the carpet from the floor by ________.
A. cohesion and solubility B. adhesion and solubility C. adhesion, cohesion, and solubility D. adhesion and cohesion
Cell size is limited by the ability of oxygen, nutrients, and wastes to diffuse through the cell membrane
Indicate whether the statement is true or false