Phosphodiester Bond

Q. A nucleotide is composed of

1. Nitrogenous base, pentose sugar, and phosphoric acid
2. Nitrogenous base, hexose sugar, and phosphoric acid
3. Nitrogenous base and hexose sugar
4. Nitrogenous base and pentose sugar

Q. Deoxyadenylic acid is

1. adenosine + deoxyribose + phosphate
2. adenine + deoxyribose + phosphate
3. adenosine + sugar
4. adenine + sugar

Q. The unique type of bonds found in Nucleic acids, formed due to the condensation at the phosphorus end, are called _____.

1. Phospho diester bonds

2. Disulphide bonds

3. Peptide bonds

4. Glycosidic bonds

Q. Nucleotides are building blocks of nucleic acids. Which of the following correctly represents the structure of nucleic acids?

1. $\text{Base - Sugar -OH}$
2. $\text{Base - Sugar - Phosphate}$
3. $\text{Sugar - Phosphate}$
4. ${\text{(Base - Sugar - Phosphate)}}_n$

Q. Choose the correct pair.

1. Protein - phosphodiester bond
2. Protein - glycosidic bond
3. Carbohydrate - peptide bond
4. Nucleic acid - phosphodiester bond

Q.

The reaction where a phosphate groups bond to a nucleotides to form a nucleic acid molecule is known as ___.

1. Reduction

2. Oxidation

3. Dehydration synthesis

4. Transesterification reaction

Q. The phosphodiester bond in a nucleic acid is formed between

1. 3’ carbon of one sugar of the nucleotide with the 5’ carbon of the sugar of the succeeding nucleotide
2. 5’ carbon of one sugar of the nucleotide with the 3’ carbon of the sugar of the preceding nucleotide
3. any two adjacent nucleotides in a nucleic acid in which 5’ and 3’ hydroxyls of two adjacent sugars form a double ester with phosphoric acid
4. All the above statements are correct

Q. Peptide bond is a type of

1. ionic bond
2. covalent bond
3. disulphide bond
4. hydrophobic bond

Q. Peptide bonds are present in nucleic acids.

1. True
2. False

Q. Which of the following codons has no tRNA?

1. UAA
2. UGC
3. UAU
4. UGU
5. UGG

Q. Deoxyadenylic acid is

1. adenine + sugar
2. adenine + deoxyribose + phosphate
3. adenosine + deoxyribose + phosphate
4. adenosine + sugar

Q. Select the incorrect statement.
a. Six codons do not code for any amino acid.
b. Codon reading of mRNA is contiguous.
c. Three codons function as stop codons.
d. Initiator codon AUG codes for methionine.

1. a, b and c are incorrect
2. a alone is incorrect
3. a, b and d are incorrect
4. b alone is incorrect
5. b, c and d are incorrect

Q. Select the mismatch.

1. DNA ligases – Join ends of cut DNA molecules
2. Exonucleases – Remove nucleotides from the ends of the DNA
3. Nucleases – Separate the two strands of DNA
4. DNA polymerase – Adds nucleotides to 3' end of a DNA strand

Q. Match the triplet codons mentioned in list I with their amino acids mentioned in listcolumn II and select the correct option from the given codes.

Q. Which of the following biomolecules does have a phosphodiester bond?

1. Nucleic acids in a nucleotide
2. Fatty acids in a diglyceride
3. Monosaccharides in a polysaccharide
4. Amino acids in a polypeptide

Q. A glycosidic bond occurs in which of the following biomolecules:-

1. Proteins and Carbohydrates.
2. Carbohydrates and fats.
3. Carbohydrates and DNA.
4. None of the above.

Q. The bonds holding the characteristic foldings of polypeptide chains in a protein molecule are

1. Peptide bonds
2. Hydrogen bonds
3. Glycosidic bonds
4. Disulphide bonds

Q. Which among these contains maximum energy?

1. Cyclic AMP
2. ADP
3. AMP
4. Adenosine

Q.

The reaction where a phosphate groups bond to a nucleotides to form a nucleic acid molecule is known as ___.

1. Phosphodiester bond

2. Oxidation

3. Dehydration synthesis

4. Transesterification reaction

Q. Which of the following biomolecules does have a phosphodiester bond

1. Fatty acid in a diglyceride
2. Amino acids in polypeptide
3. Monosaccharides in polysaccharide
4. Nucleotides in nucleic acid

Q. The phosphodiester bond in a nucleic acid is formed between

1. 5’ carbon of one sugar of the nucleotide with the 3’ carbon of the sugar of the preceding nucleotide
2. any two adjacent nucleotides in a nucleic acid in which 5’ and 3’ hydroxyls of two adjacent sugars form a double ester with phosphoric acid
3. All the above statements are correct
4. 3’ carbon of one sugar of the nucleotide with the 5’ carbon of the sugar of the succeeding nucleotide

Q. Choose the correct pair.

1. Protein - phosphodiester bond
2. Nucleic acid - phosphodiester bond
3. Carbohydrate - peptide bond
4. Protein - glycosidic bond

Q. The bond between the phosphate and hydroxyl group of sugar is a/an

1. glycosidic bond
2. ester bond
3. phosphoanhydride bond
4. peptide bond