Question

use the diagram above to answer the next question.
what type of bonds hold molecule 1 and molecule 2 together?
select one:
a. molecule 1 = ionic bonds; molecule 2 = hydrogen bonds
b. molecule 1 = hydrogen bonds; molecule 2 = peptide bonds
c. molecule 1 = hydrogen bonds; molecule 2 = covalent bonds
d. molecule 1 = peptide bonds; molecule 2 = hydrogen bonds

Explanation:

• Molecule 1 is DNA. The two strands of DNA are held together by hydrogen bonds between complementary base pairs (A - T and C - G).
• Molecule 2 is a polypeptide chain (represented by different shapes connected). The bonds between the amino acids in a polypeptide chain (which make up the primary structure of a protein) are covalent peptide bonds. But looking at the options, for the bonds within Molecule 2 (assuming it's a general chain of subunits like in a polymer - like structure in a basic molecular bonding context for this question), covalent bonds are the type that hold the subunits together (peptide bonds are a specific type of covalent bond for amino - acid chains, but if we consider the general bond type for a chain of molecules like in a simple polymer representation in a basic biology - molecular bonding question, covalent is the broader category). And for DNA (Molecule 1), hydrogen bonds hold the two strands together.

Answer:

C. Molecule 1 = hydrogen bonds; Molecule 2 = covalent bonds