Other than the nucleus, which two organelles contain their own DNA? What explanation has Lynn Margulis proposed to account for the presence of DNA in these organelles?

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

What makes a dominant allele different from a recessive allele

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?