Describe the packing of chromatin from the 10-nm to the 30-nm fiber stage. What is the role of histones?
What will be an ideal response?
10-nm chromatin fiber consists of nucleosomes–"beads" of DNA wound around eight core histone proteins–connected by strands of linker DNA. The 30-nm chromatin fiber is created by the binding of histone H1, which brings the linker DNA and the nucleosomes closer together. In the solenoid model of the 30-nm fiber, the nucleosomes are brought together into a spiraling helical structure, with about six nucleosomes per complete turn.
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Which of the following cells is a granulocyte?
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If both parents are "carriers" due to the presence of one copy of the cystic fibrosis allele, what are the odds that they would have a normal child?
a. 0 b. 25% c. 50% d. 75% e. 100%
Most kidney problems in the United States result
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The carotid bodies detect carbon dioxide in the blood and is, therefore, a
a. chemoreceptor. b. photoreceptor. c. thermoreceptor. d. mechanoreceptor. e. movement receiver.