Why is histone H1 referred to as the linker histone?
What will be an ideal response?
When chromatin is treated with nucleases, initially a larger portion of the DNA is protected, but when more extensive digestion is carried out and H1 is released, the DNA fragment protected is smaller. This shows that H1 binds to linker DNA unlike the histones of the nucleosome.
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DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase?
A) The two strands of the double helix would separate. B) The phosphodiester bonds between deoxyribose sugars would be broken. C) The purines would be separated from the deoxyribose sugars. D) The pyrimidines would be separated from the deoxyribose sugars. E) All bases would be separated from the deoxyribose sugars.
What is the wobble hypothesis, and what implications does it have for base-pairing rules and selective pressure on codons?
What will be an ideal response?
Which one of the following populations of cells is most markedly increased during bacterial infections?
A) neutrophils B) red blood cells C) platelets D) lymphocytes E) monocytes
In order for a new species to be established from a previous species,
A. there must be genetic differences between the two groups. B. the two groups must have similar habitat requirements. C. they must live in different places. D. All of these answers are true.