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DNA Structure and Replication
DNA Structure and Replication

... – Copy of DNA results ...
DNA sequencing
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Reproduction and Heredity

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Genetic Technology

AP Biology Discussion Notes
AP Biology Discussion Notes

... Oswald Avery’s Experiments (1930 – 1944) •Series of experiments showed that the activity of the material responsible for transformation is not affected by proteindestroying enzymes. •The activity is stopped, however, by a DNA-destroying ...
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DNA, RNA, Genetic Engineering

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No Slide Title

... • Viral DNA injected into cells • Cells evolved nucleases in cytoplasm that chomp up any RNA or DNA out there • Nucleases can’t get through the nuclear envelope so DNA is safe • mRNA sent out into the cytoplasm must be protected – Methyl cap is a block – Poly A tail is a fuse ...
Ch. 11
Ch. 11

... 2. There are 4 different nitrogen bases that make up DNA. The bases pair together as follows: ___________ and _____ 3. In 1953, James Watson and Francis Crick proposed that DNA consists of 4 nucleotides found inside the nucleus in the form of a ____________________________ B. Replication of DNA a. _ ...
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chapter 11, 12, 13 practice questions
chapter 11, 12, 13 practice questions

... change? What kind of mutation is this (point mutation or frameshift mutation)? F) Delete the 7th base in the original strand of DNA. How many amino acids are affected in the change? What kind of mutation is this (point mutation or frameshift mutation)? 2. Refer to Figure 11.12 on pg. 300 and describ ...
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... took about 10 years.) Thought that DNA → RNA → proteins → control the body, based on that and looking at all the different phenotypes, figured we must have a lot of genes, 100, 000’s. Only about 25, 000. (doesn’t seem to be enough to account for all the different varieties) And found that most of th ...
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Nucleic Acid review

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Structure of DNA

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... Two complementary nitrogenous bases that are held together by hydrogen bonds Large molecule composed of many repeating subunits The sugar in a DNA molecule The backbone of DNA that is made of alternating sugars and phosphates A molecule that can combine with others to form a polymer The electrostati ...
DNA Message Conversion Activity
DNA Message Conversion Activity

... DNA » mRNA » tRNA » amino acid » protein In order to reap the benefits of this "secret message," you must be able to use a genetic code chart to decode the DNA sequence. You should separate the message into codons (Three Nitrogen Bases) and match those codons with their corresponding mRNA sequences ...
DNA LIBRARIES
DNA LIBRARIES

... fragments that collectively represent the entire genome of a given organism. • cDNA library-represents a sample of all the expressed mRNA’s from a particular cell type, particular tissue, or an entire organism which has been converted back to DNA. Thus represents the genes that were actively being t ...
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... d. Reverse Transcriptase – Where was it first found? How is it utilized by scientists? i. cDNA – How is it different from regular DNA? ii. How are introns and exons relevant to cDNA iii. In GM bacteria-transformed, which DNA is used? e. ...
Expressing Genetic Information
Expressing Genetic Information

... 1. Study the scanning electron micrograph of human chromosomes during mitosis. Locate the chromatids and centromere. Now, study the fine detail of the chromatin. How would you describe it? 2. What is stored in the chromatin, the genetic material of DNA? 3. Genes are discrete units of DNA that act in ...
Cell Transformation
Cell Transformation

... Quick Review Different enzymes can be used to cut, copy, and move segments of DNA. Characteristics produced by the segments of DNA may be expressed when these segments are inserted into new organisms, such as bacteria. Inserting, deleting, or substituting DNA segments can alter genes. (mutations) A ...
Biology 303 EXAM II 3/14/00 NAME
Biology 303 EXAM II 3/14/00 NAME

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Science - edl.io
Science - edl.io

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DNA supercoil



DNA supercoiling refers to the over- or under-winding of a DNA strand, and is an expression of the strain on that strand. Supercoiling is important in a number of biological processes, such as compacting DNA. Additionally, certain enzymes such as topoisomerases are able to change DNA topology to facilitate functions such as DNA replication or transcription. Mathematical expressions are used to describe supercoiling by comparing different coiled states to relaxed B-form DNA.As a general rule, the DNA of most organisms is negatively supercoiled.
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