Question

what determines the genetic code carried by dna?
a. the number of nucleotides it contains
b. the sequence of its nitrogenous bases
c. the order of its sugars and phosphate groups
d. the type of proteins it contains

Explanation:

DNA is composed of nucleotides. Each nucleotide has a nitrogenous base (adenine - A, thymine - T, cytosine - C, guanine - G). The genetic code is determined by the sequence of these nitrogenous bases. Different sequences code for different proteins (through transcription to mRNA and then translation). The number of nucleotides (A) doesn't determine the code - it's the specific order. The sugars (deoxyribose) and phosphate groups (C) form the backbone of DNA and don't carry the genetic information. DNA contains genes that code for proteins, but it doesn't "contain" proteins in the way that proteins determine its code (D is wrong).

Answer:

B. The sequence of its nitrogenous bases