The discovery that some proteins are composed of more than one polypeptide chain and that different polypeptide chains are encoded by separate genes became the
a. one protein, one polypeptide hypothesis.
b. many genes, many polypeptides hypothesis.
c. one gene, one enzyme hypothesis.
d. research that revealed the process of translation.
e. one gene, one polypeptide hypothesis.

one gene, one polypeptide hypothesis

Explanation:

A protein may have one or more than one polypeptide chain. Each of the different types of the polypeptide chain of a protein is encoded by a specific gene. Earlier it was thought that one gene codes for one enzyme and it was called one gene-one enzyme hypothesis.

However, it soon became evident that some proteins are heterogeneous in nature which means that they have more than one type of polypeptide chains which in turn are encoded by different genes. For instance, the insulin hormone has two types of polypeptide chain namely A and B chains. They are encoded by different genes.

oxidation

explanation:

answer

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.