DNA (D-E) SYI

What is the structure of DNA?

• Polypeptide
• Polynucleotide
• Polysaccharide
• Polysome

How are DNA molecules composed?

• Single strand
• Triple helix
• Double strand
• Quadruple strand

What bonds hold the sugar-phosphate backbone of DNA together?

• Ionic bonds
• Phosphodiester bonds
• Hydrogen bonds
• Peptide bonds

What type of bond links the 5-carbon of one deoxyribose sugar to the phosphate group of the same nucleotide in a DNA strand?

• Ionic bond
• Covalent bond
• Hydrogen bond
• Disulphide

What holds the two DNA polynucleotide strands together in the DNA molecule?

• Ionic bonds
• Covalent bonds
• Hydrogen bonds
• Peptide bonds

Which pairs of nitrogenous bases always form hydrogen bonds in DNA?

• A-T and G-C
• A-C and T-G
• A-G and T-C
• A-U and G-T

What is the term for the three-dimensional shape formed by the twisting of the DNA molecule?

• Linear structure
• Triangular helix
• Single helix
• Double helix

What is the process of adenine (A) always pairing with thymine (T) called?

• Base mispairing
• Base swapping
• Base pairing
• Base twisting

How many hydrogen bonds are formed between adenine (A) and thymine (T) in DNA?

• 1
• 2
• 3
• 4

How many hydrogen bonds are formed between guanine (G) and cytosine (C) in DNA?

• 1
• 2
• 3
• 4