In a DNA molecule, if 38% of the molecular bases are C (cytosine), what percent of the bases are T (thymine)?

In a DNA molecule containing 38% of Cytosine(C), The percentage of Thymine(T) is 12%

According to Chargaff's Rule:

Since the proportion of C is 38%, the Guanine will also be 38%

A+T= 100-76

A+T= 24

A=12 and T= 12

Therefore, we can conclude that The percentage of Thymine(T) is 12%

For more about Chargaff'link rule you can refer to the link:

All the information for the genes is stored in the DNA. DNA stands for deoxyribose nucleic acid. The DNA is present at the chromosome as in highly coiled form in the nucleus.

The DNA is made from the following:-

The thymine requires to join with the adenine is 12% because.

DNA has 4 nitrogenous bases, that are adenine, guanine, cytosine, and thymine. The adenine binds to the thymine with the double hydrogen bond in the same ratio and the guanine binds to the cytosine with the triple hydrogen bond.

Hence, according to the Erwin Chargaff rule, the ratio of purine to pyrimidines will be the same. hence the percentage of the "T" will be 12%.

For more information, refer to the link;-

link

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.