Lesson 547 of 1524
Molecular Biology
Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.
Practice this chapterEach nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. Each strand is composed of nucleotides bonded together covalently between the phosphate group of one and the deoxyribose sugar of the next.
The DNA molecule is a polymer of nucleotides. There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine).
deoxyribose — a five-carbon sugar molecule with a hydrogen atom rather than a hydroxyl group in the 2' position; the sugar component of DNA nucleotides. nitrogenous base — a nitrogen-containing molecule that acts as a base; often referring to one of the purine or pyrimidine components of nucleic acids. phosphate group — a molecular group consisting of a central phosphorus atom bound to four oxygen atoms. DNA molecule — a polymer of nucleotides.
Worked example
What does “deoxyribose” mean in Molecular Biology?
- 1Use the wording this chapter gives for deoxyribose.
- 2The book says: a five-carbon sugar molecule with a hydrogen atom rather than a hydroxyl group in the 2' position; the sugar component of DNA nucleotides.
- 3Do not use the meaning of nitrogenous base. That term means a nitrogen-containing molecule that acts as a base; often referring to one of the purine or pyrimidine components of nucleic acids.
Result: a five-carbon sugar molecule with a hydrogen atom rather than a hydroxyl group in the 2' position; the sugar component of DNA nucleotides
Why. That is the meaning this chapter gives for deoxyribose.
Do not swap deoxyribose and nitrogenous base. deoxyribose means a five-carbon sugar molecule with a hydrogen atom rather than a hydroxyl group in the 2' position; the sugar component of DNA nucleotides. nitrogenous base means a nitrogen-containing molecule that acts as a base; often referring to one of the purine or pyrimidine components of nucleic acids.
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This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.