Question

1. nitrogenous bases are found on both strands of the dna double helix. what is the significance of the nitrogenous bases?

the amount of thymine and guanine in the dna molecules determines the length of the gene.
the number of adenines and cytosines determines the type of dna that will be produced.
the order of nitrogenous bases determines the traits of the organism.
the type of hydrogen bonding between the nitrogenous bases determines which amino acid will be added to the peptide chain.

Explanation:

Nitrogenous bases in DNA (adenine, thymine, cytosine, guanine) are arranged in a specific order. This order is like a code. Just as different sequences of letters form different words with different meanings, the order of nitrogenous bases forms the genetic code. This genetic code determines the traits of an organism. For example, it can determine eye color, hair texture etc. The first option is wrong because the length of a gene is mainly determined by the number of base - pairs (not just thymine and guanine). The second option is incorrect as the type of DNA (it's always DNA, but different sequences) is not determined by just adenine and cytosine. The fourth option is wrong because the type of hydrogen bonding (which is related to base - pairing rules: A - T, C - G) is more about the structure of DNA, and the addition of amino acids to the peptide chain is determined by the mRNA codons (which are based on the DNA sequence's order, not just hydrogen - bonding type).

Answer:

The order of nitrogenous bases determines the traits of the organism.