B nucleic acids or c nucleotides
Answer & explanation:
The primary structure of a protein can be defined as the main chain of the protein formed by the binding of amino acids and which shows the sequence in which they appear is called the primary structure of the protein.
The secondary structure usually results from the hydrogen bonds that occur between the hydrogen (H) of the amino group (-NH) of one amino acid and the oxygen (O) of the carbonyl (C = O) of another.
The most common secondary structures are alpha helices, which look like springs (found in the keratin in our hair) and the beta pleated sheets, like folded sheets of paper (an example is the fibroin found in a spider's web or the cocoon of a moth).
The tertiary structure is formed when the primary structures of proteins fold over themselves.
This structure is usually the result of sulfur bonds, known as disulfide bonds, but other bonds, such as those made by metal atoms, can occur.
An example of a tertiary structure protein is <u>myoglobin</u>, which acts as a reserve of oxygen in the muscles of mammals.
Hello,
Question - About how much of ocean water is dissolved salts?
Answer - C. 4%
Why - "Stated in another way, about 3.5 percent of the weight of seawater comes from the dissolved salts." Which is almost 4%!
I would say excretion since that means the process of expelling waste matter.