Question

there are two main types of nucleic acids: dna and rna.
dna stands for deoxyribonucleic acid. it is found primarily in the cell nucleus. dna contains all of an organisms genetic information, which determines traits and helps the body function by providing instructions for making proteins. its double - stranded structure resembles a twisted ladder, or a double helix.
rna stands for ribonucleic acid. it takes instructions from dna and helps to carry them from the nucleus to other parts of the cell. rna can be found both inside and outside the cells nucleus. unlike dna, rna is typically a single - stranded molecule.
select the true statements.
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:

• The text states that DNA's double - stranded structure resembles a double helix, so "DNA has a double - helix structure" is true.
• It also says DNA provides instructions for making proteins and RNA takes instructions from DNA and helps carry them, so "DNA provides instructions for making proteins, and RNA helps carry out these instructions in the cell" is true.
• Additionally, it mentions that RNA is typically a single - stranded molecule, so "RNA is typically a single - stranded molecule" is true.

Answer:

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.