Chapter 20 Notes AP Biology I. Chapter 20.1: DNA - Pomp
... ii. causes DNA polymerase to stop adding nucleotides 3. Steps to the Sanger Sequencing Method: a. Unknown DNA is separated into two strands b. Strands are copied using chemically altered bases i. This causes ...
... ii. causes DNA polymerase to stop adding nucleotides 3. Steps to the Sanger Sequencing Method: a. Unknown DNA is separated into two strands b. Strands are copied using chemically altered bases i. This causes ...
Glencoe Biology - Leon County Schools
... Chromosome Structure DNA coils around histones to form nucleosomes, which coil to form chromatin fibers. The chromatin fibers supercoil to form chromosomes that are visible in the metaphase stage of mitosis. ...
... Chromosome Structure DNA coils around histones to form nucleosomes, which coil to form chromatin fibers. The chromatin fibers supercoil to form chromosomes that are visible in the metaphase stage of mitosis. ...
Genes and Chromosomes
... The binding of DNA by the histones generates a structure called the nucleosome. The nucleosome core is a protein structure consisting of 2 subunits each of H2A, H2B, H3 and H4. These nucleosomal structures would appear as beads on a string if the DNA were pulled into a linear structure ...
... The binding of DNA by the histones generates a structure called the nucleosome. The nucleosome core is a protein structure consisting of 2 subunits each of H2A, H2B, H3 and H4. These nucleosomal structures would appear as beads on a string if the DNA were pulled into a linear structure ...
Forensic-identification
... DNA is found in all cells with a nucleus (white blood cells, soft tissue cells, bone cells, hair root cells and spermatozoa) Half of a individual’s DNA/chromosomes come from the father & the other half from the mother. ...
... DNA is found in all cells with a nucleus (white blood cells, soft tissue cells, bone cells, hair root cells and spermatozoa) Half of a individual’s DNA/chromosomes come from the father & the other half from the mother. ...
recombinant DNA. Lesson Overview
... If two DNA molecules are cut with the same restriction enzyme, their sticky ends will bond to a DNA fragment that has the complementary base sequence. DNA ligase then joins the two fragments. The resulting molecules are called recombinant DNA. ...
... If two DNA molecules are cut with the same restriction enzyme, their sticky ends will bond to a DNA fragment that has the complementary base sequence. DNA ligase then joins the two fragments. The resulting molecules are called recombinant DNA. ...
DNA and Forensic Science
... For example, a sample of DNA from a crime scene can be used as a template for amplification. A specific region of the DNA is selected based on known sequences and small pieces of DNA, twenty to thirty bases in length, called primers, are generated on either side of the selected region. These primers ...
... For example, a sample of DNA from a crime scene can be used as a template for amplification. A specific region of the DNA is selected based on known sequences and small pieces of DNA, twenty to thirty bases in length, called primers, are generated on either side of the selected region. These primers ...
Maurice Wilkins
Maurice Hugh Frederick Wilkins CBE FRS (15 December 1916 – 5 October 2004) was a New Zealand-born English physicist and molecular biologist, and Nobel Laureate whose research contributed to the scientific understanding of phosphorescence, isotope separation, optical microscopy and X-ray diffraction, and to the development of radar. He is best known for his work at King's College, London on the structure of DNA which falls into three distinct phases. The first was in 1948–50 where his initial studies produced the first clear X-ray images of DNA which he presented at a conference in Naples in 1951 attended by James Watson. During the second phase of work (1951–52) he produced clear ""B form"" ""X"" shaped images from squid sperm which he sent to James Watson and Francis Crick causing Watson to write ""Wilkins... has obtained extremely excellent X-ray diffraction photographs""[of DNA]. Throughout this period Wilkins was consistent in his belief that DNA was helical even when Rosalind Franklin expressed strong views to the contrary.In 1953 Franklin instructed Raymond Gosling to give Wilkins, without condition, a high quality image of ""B"" form DNA which she had unexpectedly produced months earlier but had “put it aside” to concentrate on other work. Wilkins, having checked that he was free to personally use the photograph to confirm his earlier results, showed it to Watson without the consent of Rosalind Franklin. This image, along with the knowledge that Linus Pauling had published an incorrect structure of DNA, “mobilised” Watson to restart model building efforts with Crick. Important contributions and data from Wilkins, Franklin (obtained via Max Perutz) and colleagues in Cambridge enabled Watson and Crick to propose a double-helix model for DNA. The third and longest phase of Wilkins' work on DNA took place from 1953 onwards. Here Wilkins led a major project at King's College, London, to test, verify and make significant corrections to the DNA model proposed by Watson and Crick and to study the structure of RNA. Wilkins, Crick and Watson were awarded the 1962 Nobel Prize for Physiology or Medicine, ""for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material.""