Question

1. dna molecules can be tens of thousands of base pairs in length. mistakes in dna replication can lead to mutations, which may or may not be harmful to an organism. how does semi - conservative replication help prevent mutations during dna replication? the proportions of the bases are consistent within a species; however they do vary between species. using the base - pair rules, complete the following table to show the percentage of base in the five different organisms.

adenine
percentage

Explanation:

Step1: Recall DNA replication basics

DNA replication is semi - conservative. Each new DNA molecule consists of one old strand and one new strand. DNA polymerases proofread during replication.

Step2: Understand error - correction mechanisms

DNA polymerases can detect and correct mis - paired nucleotides. Mismatch repair systems also identify and repair incorrectly paired bases after replication is complete.

Step3: Consider base - pairing rules

Adenine (A) pairs with Thymine (T) and Guanine (G) pairs with Cytosine (C). This complementary base - pairing helps ensure accurate replication. If an incorrect base is added, the hydrogen - bonding pattern is disrupted, which can be detected by proofreading mechanisms.

Answer:

DNA replication has several mechanisms to prevent mutations. DNA polymerases have proofreading capabilities where they can detect and remove incorrectly added nucleotides during replication. After replication, mismatch repair systems scan the DNA for incorrectly paired bases and correct them. The complementary base - pairing rules (A - T, G - C) also contribute to accuracy as any deviation from these pairings can be recognized as an error.