Proteins have up to four levels of organic structure.
1.Primary structure - the linear arrangement of amino acids.
2. Secondary structure - areas of folding or coiling within a protein.
3. Tertiary structure - the final three dimensional structure of a protein.
4. Quaternary structure - non covalent associations that bind multiple polypeptides into a single larger protein. E.g. hemoglobin has four polymers, two alpha and two beta chains. They are non covalently bound to each other to form a single large protein - hemoglobin.
Answer:what do you mean. Do you want me to list two facts?
Explanation:
Answer:C
Explanation:
The arteries are not a cell bc that is too simple a tissue is also too simple its not a system bc arteries are not a lot of organs working together so its C
Answer:
compound microscope
Explanation:
they are illuminated and the image seen with this type of microscope is two-dimensional. this microscope is the most commonly used this microscope is the most commonly used you can view individual cells even living ones
