In an analysis of the nucleotide composition of a double stranded dna to see which
bases are equivalent in concentration, which of the following would be true?
a. a = g and c = t and a + c = g + t are both true.
b. a = g and c = t
c. a + t = g + c
d. a + c = g + t
e. a = c

C) A + T = G + C

Explanation:Erwin Chargaff suggested the rule of the base pairing of DNA structure which is that purine binds pyrimidine or adenine binds thymine and guanine binds cytosine. The composition of adenine and thymine and guanine and cytosine equals 100 percent.

In the given question, since option C shows that A binds T and G binds C and their composition equals 100%, therefore, Option-C is the correct answer.

Thus, Option-C is the correct answer.

For microorganism to grow and form a population, they require both chemical and physical requirements. The chemical requirements required are gas such as oxygen and also mineral elements. The elements that are required are nitrogen and phosphorous.  The physical elements required include the temperature of the environment. According to temperature organism are classified into three groups. Psychrophilic microorganisms are found in the cold temperatures, mesophilic are the ones which are found in the moderate temperatures and the thermophilic are found in areas with high temperatures.