Mustard gas removes guanine from DNA. For developing embryos, exposure to mustard gas can cause serious deformities because guanine a is one of the four nitrogenous bases in DNA. b stores the building blocks of proteins. c directly causes mutations in DNA. d produces energy for DNA replication.

Answer 1

The correct answer is c: directly causes mutations in DNA.

Mustard gas is a chemical compound that is known to be a potent alkylating agent, which can lead to the removal of guanine from DNA. This alteration can disrupt normal DNA function and lead to mutations, which can have serious consequences for developing embryos, resulting in deformities or other developmental issues.