The skin provides a waterproof barrier surrounding the body because of the presence of ________, a protein in the epidermal cells
Fill in the blank(s) with correct word
keratin
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The depolarization phase of an action potential requires _____
A) opening of K+ channels in the membrane B) opening of Na+ channels in the membrane C) opening of Ca2+ channels in the membrane D) a K+ concentration gradient across the membrane E) a Ca2+ concentration gradient across the membrane
Which of the following might complicate the interpretation of ChIP-Seq data?
A. Because histones can be moved around or ejected from the chromatin, some DNA might not be sequenced if it is not wrapped around a histone B. DNA wrapped around nucleosomes can never be sequenced C. The regions of DNA wrapped around a histone is too long to be sequenced with current technologies D. The DNA between nucleosomes are too compacted to be sequenced
A bacterium that you isolated from pond water appears to use light for energy. Based upon this information, you inoculate the organism into fresh media, infused with lots of carbon dioxide. Even after incubation at the correct temperature (of pond water), the organism is not growing. Your best explanation of what might have happened is
A. there was no sulfur compound added to the medium, that could be used as an electron donor. B. there is some inhibitory chemical that is preventing the growth of the bacterium. C. you were using the wrong type of sunlight as the energy source for the bacterium. D. no oxygen was added to the medium so the organism died.
The greatest mass extinction of all time, which occurred at the end of the Permian period:a
affected plants living on land more than any other group. b. was spread out over several million years. c. resulted in the extinction of more than 90% of all existing marine species. d. only impacted a few geographic regions, although the impact in these regions was staggering. e. did not affect terrestrial species