39Micrococcal nuclease releases individual nucleosomes from chromatin as particles. IntermediateStructures?Endonucleases
40High salts H1 The path of nucleosomes in the chromatin fiber Both the 10 nm fiber andthe 30 nm fiber were first seen by electron microscopy.Higher packing of thenucleosomes into “inactiveheterochromatin” may involveNon-histone proteins.The path of nucleosomes in the chromatin fiberHigh saltsH1Figure: 20.17Title:Chromatin is a thread of nucleosomesCaption:The 10 nm fiber in partially unwound state can be seen to consist of a string of nucleosomes. Photograph kindly provided by Barbara Hamkalo.
47The heritable factors that Mendel studied are now known as: a) Nucleic acidsb) Amino acidsc) Genesd) Unit factorse) PeptidesThe building blocks of genes are:a) Proteinsb) Amino acidsc) Nucleic acidsd) Lipidse) CarbohydratesDifferent forms of the same gene are known as:a) Peptidesb) Amino acidsc) Proteinsd) Allelese) Gene differences
48The main components of a membrane in a cell are: a) Lipidsb) Proteinsc) Carbohydratesd) Lipids and Proteinse) Lipids and CarbohydratesProkaryotes can be characterized by:1.The lack of a true nucleus or compartment in whichthe DNA is located2. The unique cell walls composed of murein3. The lack of mitochondria4. All of thesea) 1b) 2c) 3d) 4e) 1 and 3
49Which large organic molecules are essential chromosome components? a) Lipids and proteinsb) Proteins and nucleic acidsc) Nucleic acids and polysaccharidesd) Proteins and polysaccharidesWhich of the following is a type of nucleic acid?a) DNAb) RNAc) DNAsed) RNAsee) DNA and RNAIn Sia and Dawson's 1931 experiment:a) Mice were required to demonstrate the transforming principleb) Used serum to precipitate IIIS cells from a mixture of heat-killed IIIS and living IIR cellsc) They showed that mice play no direct role in the transforming principled) Heat-killed IIR cells mixed with living IIIS cells gave rise to IIR coloniese) None of these