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Chapter 12 Test Review
Chapter 12 Test Review

... 20. During transcription, the hydrogen bonds between base pairs are broken. 21. A three-base code (on mRNA) for an amino acid is called a codon. 22. This type of RNA, along with proteins, makes up the structure of a ribosome rRNA. 23. Which organelle makes proteins when its rRNA moves along the mRNA ...
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... are those of Jayaraman and Goldberg. They worked with another virus, T4. They chose T4 because some of its genes are transcribed into mRNA early in infection, while others are transcribed later. Are “early” and “late” genes read from the same strand? Jayaraman and Goldberg separated the T4 DNA into ...
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Mitochondrial DNA



Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, adenosine triphosphate (ATP). Mitochondrial DNA is only a small portion of the DNA in a eukaryotic cell; most of the DNA can be found in the cell nucleus and, in plants, in the chloroplast.In humans, mitochondrial DNA can be assessed as the smallest chromosome coding for 37 genes and containing approximately 16,600 base pairs. Human mitochondrial DNA was the first significant part of the human genome to be sequenced. In most species, including humans, mtDNA is inherited solely from the mother.The DNA sequence of mtDNA has been determined from a large number of organisms and individuals (including some organisms that are extinct), and the comparison of those DNA sequences represents a mainstay of phylogenetics, in that it allows biologists to elucidate the evolutionary relationships among species. It also permits an examination of the relatedness of populations, and so has become important in anthropology and field biology.
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