QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
"The sequence of nucleotides in mRNA is determined by the sequence of nucleotides in
a. amino acids
b. DNA
c. tRNA
d. ribosomes"
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Answer
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Step 1:: Identify the correct answer choice from the options provided.
The sequence of nucleotides in mRNA is determined by the sequence of nucleotides in DNA. This process is called transcription, where a segment of DNA is copied into RNA (mRNA) by the enzyme RNA polymerase.
Step 2:: Explain the reasoning behind the answer choice.
In the central dogma of molecular biology, the genetic information flows from DNA to RNA to proteins. During transcription, the DNA sequence is transcribed into a complementary RNA sequence by RNA polymerase. This means that the sequence of nucleotides in mRNA is determined by the sequence of nucleotides in the DNA template strand.
Step 3:: Eliminate incorrect answer choices.
a. Amino acids - Incorrect. Amino acids are the building blocks of proteins, and their sequence is determined by the sequence of nucleotides in mRNA through translation. c. tRNA - Incorrect. tRNA (transfer RNA) is an adaptor molecule that reads the mRNA sequence during translation and brings the corresponding amino acid to the ribosome. The sequence of nucleotides in tRNA is not the template for mRNA. d. Ribosomes - Incorrect. Ribosomes are complex molecular machines where protein synthesis occurs. They read the mRNA sequence and catalyze the formation of peptide bonds between amino acids. Ribosomes do not determine the sequence of nucleotides in mRNA.
Final Answer
The sequence of nucleotides in mRNA is determined by the sequence of nucleotides in DNA.
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