Proteins that move sugars out of cells have been identified. These proteins are known as SWEETs. Each SWEET contains seven coiled, cylindrical sections which together form a pore through the cell surface membrane bilayer, as shown in the diagram. What describes each of the seven coiled regions (1-7) of a SWEET shown in the diagram?
- Aprimary structure held in its shape by bonds such as hydrogen bonds
- Bprimary structure held in its shape by peptide bonds
- Csecondary structure held in its shape by bonds such as hydrogen bonds
- Dsecondary structure held in its shape by peptide bonds