DNA is best described as which of the following?

DNA is best described as which of the following?

• A. A double-stranded, helical nucleic acid molecule capable of replicating and determining the inherited structure of a cell's proteins.
• B. A single-stranded molecule that stores energy
• C. A protein that forms cellular membranes
• D. A lipid that stores fats

Answer: (A)

DNA is the genetic material that stores information in a stable, usable form and can be copied to pass this information to new cells and offspring. Its structure is a double-stranded, helical nucleic acid, with bases paired inside the helix so the two strands are complementary. This arrangement allows accurate replication because each strand serves as a template for a new partner strand, enabling semiconservative replication and reliable inheritance. DNA's role in inheritance comes from genes—specific sequences that code for RNA or proteins. Through transcription, a gene is read to make mRNA, which is then translated into a protein. The sequence of DNA thus determines the sequence of amino acids in cellular proteins, shaping the cell’s structure and function and, consequently, inherited traits. The other options don’t fit because they describe molecules that are not genetic material: a single-stranded molecule that stores energy, a protein that forms membranes, or a lipid that stores fats. DNA is a double-stranded nucleic acid dedicated to storing and transmitting genetic information.

DNA is the genetic material that stores information in a stable, usable form and can be copied to pass this information to new cells and offspring. Its structure is a double-stranded, helical nucleic acid, with bases paired inside the helix so the two strands are complementary. This arrangement allows accurate replication because each strand serves as a template for a new partner strand, enabling semiconservative replication and reliable inheritance.

DNA's role in inheritance comes from genes—specific sequences that code for RNA or proteins. Through transcription, a gene is read to make mRNA, which is then translated into a protein. The sequence of DNA thus determines the sequence of amino acids in cellular proteins, shaping the cell’s structure and function and, consequently, inherited traits.

The other options don’t fit because they describe molecules that are not genetic material: a single-stranded molecule that stores energy, a protein that forms membranes, or a lipid that stores fats. DNA is a double-stranded nucleic acid dedicated to storing and transmitting genetic information.