Functional unit of DNA Is____________?
Correct answer: B. Genes
- A. Nucleus
- B. Genes
- C. Chromosomes
- D. Nucleolus
Explanation
A gene is a specific segment of DNA that carries information for a functional product, such as a protein or functional RNA, making it the functional unit of heredity. A chromosome is a much larger DNA-protein structure containing many genes. Students may choose chromosome because it contains genes, but it is not the basic functional unit of DNA.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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