which statements describe proteins? select three options. proteins are created from the code in dna…

Brief Explanations:

1. DNA contains the genetic code for protein - synthesis. Transcription of DNA to RNA and then translation of RNA results in proteins, so "Proteins are created from the code in DNA" is correct.
2. Proteins are synthesized in the cytoplasm on ribosomes, not in the nucleus, so "Proteins are synthesized in the nucleus of a cell" is incorrect.
3. DNA and RNA are nucleic acids, not proteins, so "DNA and RNA are proteins" is incorrect.
4. Amino acids are linked together by peptide bonds to form proteins, so "Amino acids are the building blocks of proteins" is correct.
5. Proteins play crucial roles in the structures (e.g., collagen in connective tissues) and functions (e.g., enzymes catalyzing reactions) of living things, so "Proteins affect the structures and functions of living things" is correct.
6. The shape of a protein determines its function. For example, the specific shape of an enzyme allows it to bind to a particular substrate, so "The shape and the function of a protein are not related" is incorrect.

Answer:

• Proteins are created from the code in DNA.
• Amino acids are the building blocks of proteins.
• Proteins affect the structures and functions of living things.