The correct option is 1. The tertiary structure of a protein is determined by its interactions among R groups.
Interactions among R groups: The R groups, or side chains, of the amino acids in a protein interact with each other and can form various types of chemical bonds, such as hydrogen bonds, ionic bonds, and hydrophobic interactions. These interactions help to stabilize the tertiary structure of the protein.
Tertiary structure refers to the three-dimensional structure of a complex molecule such as a protein. It is the most complex level of structure and is responsible for the molecule's shape, size, and function. It is also responsible for the molecule's ability to interact with other molecules, such as in enzyme-substrate interactions or DNA-protein interactions.
It is an important aspect of molecular biology and biochemistry and can be studied using a variety of techniques such as x-ray crystallography, nuclear magnetic resonance spectroscopy, and cryo-electron microscopy.
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