Molecular Genetics Practice

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What is Chargaff's Rule?

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Chargaff's Rule states that in DNA, the amount of adenine (A) equals thymine (T) and the amount of cytosine (C) equals guanine (G). This is crucial for understanding base pairing in DNA.

Front

What is the structure of DNA?

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DNA is a double helix composed of two strands that run antiparallel to each other, with a backbone made of sugar and phosphate groups and nitrogenous bases (A, T, C, G) paired in the center.

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What is the role of uracil in nucleic acids?

Back

Uracil is a nitrogenous base found in RNA but not in DNA. In RNA, it pairs with adenine (A) instead of thymine (T).

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What is DNA fingerprinting?

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DNA fingerprinting is a technique used to identify individuals based on unique patterns in their DNA. It is commonly used in forensic science to solve crimes.

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What is the process of DNA replication?

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DNA replication is the process by which a DNA molecule makes a copy of itself. It involves unwinding the double helix and synthesizing new complementary strands.

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What are nucleotides?

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Nucleotides are the building blocks of DNA and RNA, consisting of a sugar, a phosphate group, and a nitrogenous base.

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What is the significance of complementary base pairing?

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Complementary base pairing ensures that the DNA strands are accurately replicated and that RNA is correctly synthesized from DNA, maintaining genetic information.

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What is the function of mRNA?

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mRNA (messenger RNA) serves as a template for protein synthesis, carrying genetic information from DNA to the ribosome where proteins are made.

Front

How many amino acids are coded by a sequence of nucleotides?

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Each amino acid is coded by a sequence of three nucleotides (codon) in mRNA. Therefore, to find the number of amino acids, divide the total number of nucleotides by three.

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What is the role of ribosomes in protein synthesis?

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Ribosomes are the cellular machinery that translate mRNA into proteins by facilitating the binding of tRNA and amino acids.