Which statements are true? Explain why or why not.1 Because the DNA double helix is only 2 nm wide—well below the limit of resolution of the light microscope—it is impossible to see chromosomes in living cells withoutspecial stains.2 A fluorescent molecule, having absorbed a singlephoton of light at one wavelength, always emits it at a lon­ger wavelength.

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Suppose that the amount of Guanine is 20% of the nucleotides in a single strand of DNA. If RNA is made from this single strand of DNA, what would be the percentage of Uracil in the complementary strand of RNA?Stepwise please

DNA Stability/Chapter 4 A solution of DNA contains two different DNA molecules. Molecule 1 is 500 base pairs and contains 100 A’s. Molecule 2 is 500 base pairs and contains 300 A’s. (1) How many AT base pairs and GC base pairs is in each DNA molecule? (2) How many, G’s, A’s, T’s and C’s are in each molecule? (3) Draw one figure that shows the relative melting temperature of the two DNA molecules.

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Some Discoveries about DNA 1. DNA is made of deoxyribose sugar, phosphate, and four nucleotides (A, G, C, and T). 2. DNA was originally isolated from white blood cells. 3. X-ray diffraction of the DNA molecules shows that it is a helical structure. 4. Adenine pairs with thymine and guanine pairs with cytosine in any sample of DNA. 5. DNA, not proteins, carries genetic information. Match the following scientists with their discoveries listed above. Discovery: Hershey Franklin Chargaff Levene Scientist: and Chase

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