A positively charged sodium ion
a. would get stuck in the hydrophobic core of the membrane.
b. freely diffuses directly across the cell membrane.
c. would require the use of integral protein channels to pass through a cell membrane.
Answer: c. would require the use of integral protein channels to pass through a cell membrane.
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The dyactin complex acts only on actin filaments
a. true b. false
Amphibians’ history include all of the following EXCEPT:a
underwent an adaptive radiation during the Carboniferous period. b. inhabited both aquatic and terrestrial ecosystems. c. are thought to have descended from lungfish during the late Devonian period. d. were the dominant terrestrial carnivores of the Carboniferous period. e. appeared for the first time in the Silurian period
A farmer's land includes a wilderness area that is home to an endangered species of bird. He wants to sell the land to a developer, and you have been hired to evaluate the environmental concerns. "This little patch of land is not crucial for the bird species!" the farmer says, "In fact, my land is surrounded by several other wilderness patches that also have that bird." You reply: "It is possible that your land acts as the ________ and the other areas are ________. If that's the case, development would be devastating to the population."
A. source; sinks B. sink; sources C. metapopulation; population D. population; metapopulation
Which of the following does a bacterium NOT contain?
a. RNA b. cytoplasm c. ribosomes d. mitochondria