Question

which best describes a gene?
a an area within the nucleus where ribosomes are made.
b a unit of dna that contains code for the creation of one protein.
c a unit of dna that gives an individual a trait.
d a unit of dna that is wrapped around proteins.

Explanation:

• Option a: The area within the nucleus where ribosomes are made is the nucleolus, not a gene.
• Option b: A gene is a unit of DNA that contains the code for the creation of one protein (or more in some cases, but this is a fundamental concept). The central dogma of molecular biology involves DNA (genes) being transcribed to RNA and then translated to proteins.
• Option c: While genes can contribute to traits, a trait is often the result of multiple genes and environmental factors. Saying a gene "gives an individual a trait" is an oversimplification compared to the more precise molecular - level definition in option b.
• Option d: DNA wrapped around proteins forms chromatin (histones), not a gene.

Answer:

B. A unit of DNA that contains code for the creation of one protein.