Based on your description of the steps involved in gene expression and protein synthesis, let's evaluate each statement:
A. Step A involves transcribing the DNA sequence into mRNA, which carries instructions out of the nucleus.
This statement is correct. In the first step of gene expression, DNA is transcribed into messenger RNA (mRNA), which indeed carries the instructions for protein synthesis from the nucleus to the cytoplasm.
B. The purpose of Step B is to fold the mRNA into a protein.
This statement is incorrect. Step B typically involves the translation of mRNA into a protein, where ribosomes read the mRNA to assemble amino acids into a polypeptide chain. Folding is a subsequent process that happens after translation.
C. Step A shows the process of DNA replication, which is necessary for protein synthesis.
This statement is incorrect. Step A refers to transcription (the production of mRNA from DNA) and not DNA replication. DNA replication is a separate process that occurs when a cell divides.
D. Step B involves translating the mRNA into a new strand of DNA that will be used for future cell division.
This statement is incorrect. Step B involves translating the mRNA into a protein, not into DNA. Translation has nothing to do with creating new DNA strands for cell division.
In summary, the only correct statement describing an aspect of gene expression and protein synthesis is statement A.
1 answer