Question

select the true statements. dna is found in the nucleus. dna has a double-helix structure. dna provides instructions for making proteins, and rna helps carry out these instructions in the cell. rna is typically a single-stranded molecule.

Explanation:

• For "DNA is found in the nucleus": In eukaryotic cells, DNA is mainly located in the cell nucleus (in structures like chromosomes), so this is true.
• For "DNA has a double - helix structure": The structure of DNA is a well - known double - helix, discovered by Watson and Crick, so this is true.
• For "DNA provides instructions for making proteins, and RNA helps carry out these instructions in the cell": DNA contains the genetic code (genes) that code for proteins. The process of protein synthesis involves transcription (where DNA is used to make RNA) and translation (where RNA (mRNA, tRNA, rRNA) helps in assembling amino acids into proteins), so this is true.
• For "RNA is typically a single - stranded molecule": Unlike DNA, most types of RNA (like mRNA, tRNA, rRNA) are single - stranded, so this is true.

Answer:

A. DNA is found in the nucleus.
B. DNA has a double - helix structure.
C. DNA provides instructions for making proteins, and RNA helps carry out these instructions in the cell.
D. RNA is typically a single - stranded molecule.