tRNAs are adapter molecules that coordinate between the mRNA and the polypeptide chain that the cell needs to build. Each tRNA is designed to carry a specific amino acid that it can add to a polypeptide chain. tRNAs bring their amino acids to the mRNA in a specific order.

Which of the following is a principle of the fluid mosaic model of cell membrane structure? Phospholipids form a bilayer that is largely impermeable to water-soluble molecules. Its DNA must be replicated exactly so that identical copies of the cell’s genes can be passed on to each of its offspring.

Transcription

Messenger RNA (mRNA) molecules carry the coding sequences for protein synthesis and are called transcripts; ribosomal RNA (rRNA) molecules form the core of a cell’s ribosomes (the structures in which protein synthesis takes place); and transfer RNA (tRNA) molecules carry amino acids to the ribosomes during protein …

proteins

The building blocks of proteins are amino acids, which are small organic molecules that consist of an alpha (central) carbon atom linked to an amino group, a carboxyl group, a hydrogen atom, and a variable component called a side chain (see below).

The basic building block of a protein is called an amino acid. There are 20 amino acids in the proteins you eat and in the proteins within your body, and they link together to form large protein molecules.

protein: building blocks When we eat protein, our body breaks these large molecules down into smaller units called amino acids. These building blocks are used for many important functions in the body, including growth and repair of muscle, connective tissue and skin.

Why your body needs protein

• Build. Protein is an important building block of bones, muscles, cartilage and skin.
• Repair. Your body uses it to build and repair tissue.
• Oxygenate. Red blood cells contain a protein compound that carries oxygen throughout the body.
• Digest.
• Regulate.