Nucleotides and Nucleosides

Q. Given below is the diagrammatic representation of one of the categories of small moleuclar weight organic compounds in the living tissues. Identify the category shown and the one blank component 'X' in it.

1. Category-Nucleotide Component -Adenine
2. Category -Nucleoside Component -Uracil
3. Category-Cholesterol Component-Guanine
4. Category -Amino acid Component-$N{H}_2$

Q.

Which of the following is not a micromolecule?

1. Tryptophan

2. Glucose

3. RNA

4. ATP

Q. The three chemically distinct components in a nucleotide are

1. a heterocyclic compound, a disaccharide and a phosphate group
2. a heterocyclic compound, a disaccharide and a hydroxyl group
3. a heterocyclic compound, a monosaccharide and a phosphate group
4. a heterocyclic compound, a monosaccharide and a hydroxyl group

Q.

Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by:

1. Base-Sugar-Phosphate

2. Base-Sugar-OH

3. Sugar-Phosphate

4. (Base-Sugar-Phosphate)n

Q. How does atp gives us energy

Q. On hydrolysis, the nucleoside does not yield:

1. Purine
2. Pyrimidine
3. Pentose sugar
4. Phosphoric acid

Q.

Choose the correct option to fill in the blanks :

The term Nucleic acid is derived from a Greek word called __(i)__, coined by __(ii)__. Each molecule of nucleic acid has basic units called __(iii)__ and the most abundant Nucleic acid is __(iv)__.

1. (i) Lipido (ii) Bloor (iii) Fatty Acids (iv) MGDG

2. (i) Nuclein (ii) Miescher (iii) Nucleotides (iv) RNA

3. (i) Proteios (ii) Mulder (iii) Amino acids (iv) Collagen

4. (i) Sakkharon (ii) Liebig (iii) Saccharide (iv) Cellulose

Q. Mitochondrial matrix contains all, $\text{except}$

1. ATP synthesis machinery
2. Linear DNA
3. RNA
4. $70$S ribosomes

Q.

Anti-parallel strands of a DNA molecule mean that

1. Phosphate groups of two DNA strands at their ends share the same position

2. One strand turns anticlockwise

3. One strand turns clockwise

4. Phosphate groups at the start of two DNA strands (poles) are in opposite position

Q.

dsRNA is found in

1. TMV

2. ϕ× 174

3. None of these

4. Retrovirus

Q.

The sugar present in a nucleotide is a

1. Oligosaccharide

2. Monosaccharide
   

3. Polysaccharide
   

4. Disaccharide
   

Q. Which one of the following is true of the pentoses found in nucleic acids?

1. C-5 and C-1 of the pentose are joined to phosphate groups by phosphodiester bonds.
2. C-5 and C-1 of the pentose are joined to a phosphate group and to a nitrogenous base respectively.
3. The pentoses are always in the furanose forms.
4. The straight-chain and ring forms undergo constant interconversion.

Q. The building block of nucleic acid is called .

1. nucleosides
2. nucleotides
3. nucleosomes
4. nuclein

Q.

Identify the following images i to iv and choose the correct option.

1. Nucleotides
2. Nucleosides
3. Purines
4. Pyrimidines