Реферат

Реферат на тему Dna Structure Essay Research Paper DNA Structure

Работа добавлена на сайт bukvasha.net: 2015-06-03

Поможем написать учебную работу

Если у вас возникли сложности с курсовой, контрольной, дипломной, рефератом, отчетом по практике, научно-исследовательской и любой другой работой - мы готовы помочь.

Предоплата всего

от 25%

Подписываем

договор

Выберите тип работы:

Скидка 25% при заказе до 26.12.2024


Dna Structure Essay, Research Paper

DNA Structure DNA is a double stranded molecule twisted into a helix. Each spiraling strand is comprised of a sugar phosphate backbone and attached bases connected to a complimentary strand. The complimentary strand is connected by non-covalent hydrogen bonding between paired bases. The bases are adenine, thymine, ctyosine, and gaunine. The fundamental building block of DNA is the nucleotide. The nucleotide has three parts. A nitrogen-containing pyrimidine or purine base, a deoxyribose sugar, and a phosphate group that acts as a bridge between the deoxyribose sugars that are adjacent to it. Each deoxyribose sugar contains five carbon atoms joined to an oxygen atom. The carbon atoms are sequentially numbered from 1-5. Each is considered a prime and is labeled such as this: 1′. The first carbon atom is the carbon atom covalently attached to one of the four bases. Guanine and adenenine are purines and cytosine and thymine are pyrymidines. The phosphate groups are attached to the (3′) third and (5′) fifth carbon atoms. When speaking of DNA the term nucleotide refers to the complete assembly of a nitrogenous base, a five carbon deoxyribose sugar, and a phosphate group. A DNA molecule is composed of two unbranched polynucleotide chains that wind about each other into a structure called a double helix. Each revolution is 34 A, there are ten base pairs in each revolution. The structure of DNA is an advantage because of it’s simplicity. This structure lessens the chance of mutation during replication. Robert D. Stewart, Ph.D. A Few Words About DNA and Chromatin Dosimetry research and Technology (DRT) Group K3-55 Pacific Northwest National Laboratory (PNNL)


1. Реферат на тему Ferris Wheel Essay Research Paper A date
2. Реферат Рынок банковских пластиковых карт в РФ
3. Реферат Учет, анализ и аудит движения товаров на предприятиях оптовой торговли
4. Реферат Технологические основы машиностроения лекции
5. Реферат на тему Unities In The Tempest Essay Research Paper
6. Реферат Единство и преемственность требования, предъявляемые к балансу в соответствии с законом о бух
7. Курсовая Проблемы управления рисками на российских фирмах и предприятиях
8. Реферат Цена и объем производства в условиях монополии и олигополической конкуренции
9. Реферат на тему Храм
10. Сочинение на тему Литературный герой ГАЙАВАТА