In the double helix of DNA, the two DNA strands are:
Correct answer: E. Both A and B
- A. Coiled around a common axis
- B. Coiled around each other
- C. Coiled differently
- D. Coiled over protein sheath
- E. Both A and B
Explanation
According to the Watson-Crick model, the DNA molecule consists of two long, parallel chains which are joined together by short crossbars at regular intervals. The two chains are spirally coiled around a common axis in a regular manner to form a right-handed double helix.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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