If a mutated dna sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred? a) an addition mutation b) none. c) an addition mutation and a deletion mutation. d) a deletion mutation.

Option C is the correct answer.

Explanation:

Mutation: Mutation is defined as a heritable change in the sequence of DNA of an organism, and the resulting species known as mutant. A change in DNA sequence is extended to mRNA through the process of transcription, and cause to alter sequence of amino acid in a protein on translation process.

So, If a mutated DNA sequence produces a protein that differs in one, central amino acid from the normal protein is cause an addition mutation and a deletion mutation. It means may addition of one or more bases, or may removal of one or more bases in amino acid sequence.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.