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Questions and Answers
Which of the following is considered a nucleoside?
Which of the following is considered a nucleoside?
- AMP
- Adenosine (correct)
- GMP
- ATP
What is the guanosine concentration in a DNA molecule if the thymine concentration is 30%?
What is the guanosine concentration in a DNA molecule if the thymine concentration is 30%?
- 20%
- 30%
- 40%
- 10% (correct)
What sugar is present in RNA?
What sugar is present in RNA?
- Ribulose
- Ribose (correct)
- Arabinose
- Deoxyribose
What structure forms when DNA wraps around histones?
What structure forms when DNA wraps around histones?
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What is the packing ratio in a 30 nm chromatin fiber?
What is the packing ratio in a 30 nm chromatin fiber?
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Study Notes
Nucleosides
- Adenosine is a nucleoside.
Nucleotides
- AMP (Adenosine monophosphate) is a purine nucleotide.
DNA Composition
- In a DNA molecule, the concentration of guanine is equal to the concentration of cytosine.
- Thymine and adenine are paired in DNA, with a concentration ratio of 1:1.
- If the concentration of thymine is 30%, then the concentration of guanine will be 20%.
RNA Structure
- RNA contains the sugar ribose.
DNA Packaging
- The simplest unit of DNA-protein integration is a nucleosome.
- A nucleosome is a bead-like structure formed by DNA wrapping around histone proteins.
- The diameter of a nucleosome is 11 nm.
- Histones are proteins aiding in DNA packaging.
- The 30 nm chromatin fiber has a packing ratio of 6 fold.
- The diameter of a chromatin fiber is 30 nm.
- Scaffold proteins help in rosette formation.
- H1 histone is involved in linking nucleosomes to form a 30 nm fiber.
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