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Molecular Basis of Inheritance MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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668 questions in this chapter
Question 231 of 668
📘 CLASS XII
DNA is a long polymer of _______
Nucleic acids like DNA are polymers made up of monomeric units called nucleotides.
Question 232 of 668
📘 CLASS XII
A nucleotide consists of a nitrogenous base, a pentose sugar, and a _______ group.
A nucleotide has three components: a nitrogenous base, a pentose sugar, and a phosphate group.
Question 233 of 668
📘 CLASS XII
The nitrogenous bases Adenine and Guanine are classified as _______
Adenine and Guanine are purines, which are nine-membered double-ring structures.
Question 234 of 668
📘 CLASS XII
Cytosine, Thymine, and Uracil are classified as _______
Cytosine, Thymine, and Uracil are pyrimidines, which are six-membered single-ring structures.
Question 235 of 668
📘 CLASS XII
Thymine is present in DNA, whereas _______ is present in RNA.
Uracil replaces Thymine in RNA.
Question 236 of 668
📘 CLASS XII
A nitrogenous base is linked to the pentose sugar through a _______ linkage.
The nitrogenous base is linked to the pentose sugar via an N-glycosidic linkage to form a nucleoside.
Question 237 of 668
📘 CLASS XII
When a phosphate group is linked to the 5' OH of a nucleoside, a _______ is formed.
Adding a phosphate group to a nucleoside forms a nucleotide.
Question 238 of 668
📘 CLASS XII
Two nucleotides are linked through a 3'-5' _______ linkage.
Nucleotides are joined by phosphodiester bonds to form a polynucleotide chain.
Question 239 of 668
📘 CLASS XII
The backbone of a polynucleotide chain is formed due to _______ and phosphates.
The backbone consists of alternating sugar and phosphate groups.
Question 240 of 668
📘 CLASS XII
5-methyl uracil is another name for _______
Thymine is chemically 5-methyl uracil.
