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DNA – Worksheet
DNA – Worksheet

... What base will pair with cytosine? What base will pair with adenine? The shape of the DNA structure is twisted, it is better known as ___. 6. What is the process called when DNA copies itself? 7. Name the three types of RNA. 8. What is transcription? 9. What is translation? 10. What kind of informat ...
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... their rate of movement through a gel under the influence of an electrical field. The direction of movement is affected by the charge of the molecules, and the rate of movement is affected by their size and shape, the density of the gel, and the strength of the electrical field. DNA is a negatively c ...
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Ch. 12 - DNA and RNA
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DNA & DNA Replication
DNA & DNA Replication

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three possibile models for replication
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Compare DNA and RNA in terms of structure, nucleotides, and base

... complementary strand of RNA. Through the process of transcription, the DNA code is transferred out of the nucleus to the ribosomes.  Through a series of chemical signals, the gene for a specific protein is turned on. An enzyme attaches to the exact location on the DNA molecule where the gene is fou ...
DNA: The Code of Life
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... B. The order of the nitrogen bases in a DNA molecule make up the chemical “code” which provides the information necessary to make proteins and control all of the traits and characteristics in an organism (this is sometimes called the “code of life”). 1. A gene is a segment of DNA code that provides ...
NITROGEN BASES in DNA
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... diffraction photo, scientists can determine the structure of the molecule. • In 1952, Maurice Wilkins and Rosalind Franklin developed high-quality X-ray diffraction photographs of strands of DNA. • These photographs suggested that the DNA molecule resembled a tightly coiled helix and was composed of ...
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... Alfred Hershey and Martha Chase* (1950’s) • Used radioactive labels on bacteriophage components to decide if DNA or protein was the transforming factor • Label viral protein with S35 * • Label viral DNA with P32 * • Allow infection • Wash viral particles (with blender!) • Check for label after subse ...
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Answers to Mastering Concepts Questions
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Nucleotides and lipids
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...  DNA is a polynucleotide  the DNA structure is described as a double helix  RNA is a single-stranded molecule  mRNA is messenger RNA that carries the genetic code from the nucleus to the ribosome  rRNA is ribosomal RNA found in ribsomes during protein synthesis  tRNA is transfer RNA that ...
7.014 Problem Set 3 Solutions
7.014 Problem Set 3 Solutions

... After acing the 7.014 Quiz 1, you take a well-deserved break and go “looking for Baker House.” Somewhere in the tunnels you stumble on a device you have never seen before, and start playing with its dials. It turns out to be a time- and reality-transporting device. It lands you in the office of the ...
7.014 Problem Set 3 Solutions
7.014 Problem Set 3 Solutions

... After acing the 7.014 Quiz 1, you take a well-deserved break and go “looking for Baker House.” Somewhere in the tunnels you stumble on a device you have never seen before, and start playing with its dials. It turns out to be a time- and reality-transporting device. It lands you in the office of the ...
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Helicase



Helicases are a class of enzymes vital to all living organisms. Their main function is to unpackage an organism's genes. They are motor proteins that move directionally along a nucleic acid phosphodiester backbone, separating two annealed nucleic acid strands (i.e., DNA, RNA, or RNA-DNA hybrid) using energy derived from ATP hydrolysis. There are many helicases resulting from the great variety of processes in which strand separation must be catalyzed. Approximately 1% of eukaryotic genes code for helicases. The human genome codes for 95 non-redundant helicases: 64 RNA helicases and 31 DNA helicases. Many cellular processes, such as DNA replication, transcription, translation, recombination, DNA repair, and ribosome biogenesis involve the separation of nucleic acid strands that necessitates the use of helicases.
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