Question

which best matches a type of genetic material with its description?
nucleotides form a helical structure that is called a gene.
genes combine to form structures called nucleotides.
chromosomes create genes.
dna is located in the nucleus.

Explanation:

1. Analyze the first option: Nucleotides are the building blocks of DNA/RNA, and DNA (not nucleotides directly) forms a double - helix. A gene is a segment of DNA, so nucleotides don't form a helix called a gene.
2. Analyze the second option: Genes are made of DNA, and DNA is made of nucleotides. So genes do not combine to form nucleotides; rather, nucleotides form DNA which makes up genes.
3. Analyze the third option: Chromosomes are made up of DNA and proteins, and genes are segments of DNA. So chromosomes do not create genes; genes are part of the DNA that makes up chromosomes.
4. Analyze the fourth option: DNA (in eukaryotic cells) is located in the nucleus (in the form of chromosomes). This is a correct statement about the location of DNA.

Answer:

D. DNA is located in the nucleus.