Each nucleotide consists of the pentose sugar deoxyribose, a phosphate group and a nitrogenous base which may be either a purine or a pyrimidine. Deoxyribose and a nitrogenous base together form a nucleoside.
A nucleoside and a phosphate together form a nucleotide. Deoxyribose is a pentose sugar with five carbon atoms. Four of the five carbon atoms plus a single atom of oxygen form a five membered ring. The fifth carbon atom is outside the ring and forms a part of a —CH2 group. All the sugars in on e strand are directed to one end, i. The sugars of the two strands are directed in opposite directions. There are two types of nitrogenous bases, pyrimidines and purines.
In the DNA strand the phosphate groups alternate with deoxyribose. The two strands are oriented in opposite directions. Consequently the oxygen atoms of deoxyribose point in opposite directions in the two strands. A sugar molecule and a nitrogenous base form a nucleoside and a nucleoside plus a phosphate group forms a nucleotide a nucleoside. Find a degree that fits your goals.
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Structure, Overview Adenine is an important building block for life. Sticky Ends of DNA: Test your knowledge of this chapter with a 30 question practice chapter exam. Other Practice Exams in this course. Test your knowledge of the entire course with a 50 question practice final exam. Earning College Credit Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.
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The DNA molecule consists of two helically twisted strands connected together by ‘steps’. Each strand consists of alternating molecules of deoxyribose and phosphate groups. Each step is made up of a double ring purine base and a single ring pyramiding base.
DNA Synthesis and DNA Replication: Advanced Assignment Help What Is DNA synthesis? The creation of deoxyribonucleic acids (DNA), either through a natural or through an artificial way, is known as DNA synthesis. Proteins are very important biochemical compounds. Translation is one of the steps in protein synthesis, an important process that occurs in cells.
The DNA Replication chapter of this AP Biology Homework Help course helps students complete their DNA replication homework and earn better grades. This homework help resource uses simple and fun videos that are about five minutes long. DNA molecules consist of two strands of biochemical compounds called nucleotides linked together by chemical bonds. Nucleotides are composed of three molecules: a phosphate, a sugar, and a nitrogen-containing base.