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Questions and Answers
What is the role of helicase in DNA replication?
What is the role of helicase in DNA replication?
- Unwinds the DNA strand (correct)
- Builds a new strand of DNA
- Binds the Okazaki fragments
- Instructs the direction to polymerase
Which nitrogenous base pairs with adenine in RNA?
Which nitrogenous base pairs with adenine in RNA?
- Thymine
- Guanine
- Cytosine
- Uracil (correct)
What is the function of ligase in DNA replication?
What is the function of ligase in DNA replication?
- Builds a new strand of DNA
- Binds the Okazaki fragments in a lagging strand (correct)
- Unwinds the DNA strand
- Instructs the direction to polymerase
What type of sugar does RNA contain?
What type of sugar does RNA contain?
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What is the role of primase in DNA replication?
What is the role of primase in DNA replication?
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Study Notes
Molecular Components of DNA and RNA
- DNA has four components: phosphate group, nitrogenous base (adenine, guanine, thymine, cytosine), sugar group.
- DNA replication involves four stages: helicase unwinds the DNA strand, primase instructs the direction to polymerase, polymerase builds the new DNA strand, ligase binds Okazaki fragments in the lagging strand.
- RNA, or ribonucleic acid, plays a crucial role in protein synthesis and gene regulation.
- RNA is composed of nucleotides, each consisting of a ribose sugar, a phosphate group, and a nitrogenous base (adenine, uracil, cytosine, guanine).
- Unlike DNA, RNA contains ribose sugar instead of deoxyribose sugar.
- RNA has four types of nitrogenous bases: adenine, uracil, cytosine, and guanine.
- Adenine pairs with uracil in RNA, unlike in DNA where adenine pairs with thymine.
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