According to Watson and Crick's model of DNA, the DNA molecule consists of a double helix. What type of forces are responsible to keep two strands of DNA together?
Correct answer: C. Hydrogen bonding
- A. Van der Waals forces
- B. Ionic bonding
- C. Hydrogen bonding
- D. Dipole-induced dipole forces
Explanation
The bases in each complementary base pair have hydrogen bonds between them, which keeps the two strands together and stable. 'A' and 'T' have 2 hydrogen bonds between them, while 'G' and 'C' have three hydrogen bonds between them. The answer is C, as the other options do not mention hydrogen bonding.
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Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
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