Class XII · Biology practice

Molecular Basis of Inheritance MCQs

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668 questions in this collection · Page 24 of 67

Question 231 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

Thymine is present in DNA, whereas _______ is present in RNA.

Uracil replaces Thymine in RNA.

Question 236 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

5-methyl uracil is another name for _______

Thymine is chemically 5-methyl uracil.

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