Assessment and Qualifications Alliance (AQA) AS Biology Practice Exam 2025 - Free AS Biology Practice Questions and Study Guide

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What are the components of a nucleotide?

A sugar, a fat, and an amino acid

A sugar, a phosphate group, and a nitrogenous base

The correct answer highlights that a nucleotide is composed of three essential components: a sugar, a phosphate group, and a nitrogenous base. These components are fundamental to the structure and function of nucleotides, which are the building blocks of nucleic acids like DNA and RNA.

The sugar, typically deoxyribose in DNA and ribose in RNA, provides the backbone of the nucleotide. The phosphate group is attached to the sugar and helps link nucleotides together through phosphodiester bonds, forming the nucleic acid structure. The nitrogenous base (which can be adenine, thymine, cytosine, guanine in DNA, and uracil in RNA) is critical for encoding genetic information and allows for the pairing that is vital for the double-helix structure of DNA.

Understanding the composition of nucleotides is crucial in the study of genetics and molecular biology, as these molecules are key to the processes of replication, transcription, and translation.

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An amino acid, a nucleotide, and a protein

A protein, a lipid, and a carbohydrate

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