Question

In human cells, the four nitrogen bases that make up the genetic code are shared with

A)
primates only.
B)
mammals only.
C)
all eukaryotes, but no prokaryotes. 
D)
all living organisms.

Answer 1

I believe the answer would be D.

The four bases, Adenine, Guanine, Cytosine, and Thymine, are found in all DNA. This means, that no matter what, everything will have these four bases.

A is incorrect because all cells will have the four bases because all cells have DNA.

B is incorrect because, as I stated before, all cells will have the four bases because all cells have DNA. (This also includes plants as well.)

C is incorrect, because prokaryotes have DNA as well, so they have the four bases.

Answer 2

all eukaryotes but no prokaryotes