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What is wrong with the following piece of mRNA? TACCAGGATCACTTTGCCA Multiple Choice It contains A. O It does not include an equal number of As and Ts. It does not include an equal number of Gs and Cs. It contains T and not U. What is wrong with the following piece of mRNA? TACCAGGATCACTTTGCCA Multiple Choice It contains A. It does not include an equal number of As and Ts. It does not include an equal number of Gs and Cs.

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Simon

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Step 1/4

Messenger RNA (mRNA) is a vital molecule involved in protein synthesis within cells. It acts as a messenger, transferring genetic information from the cell's nucleus to the ribosomes in the cytoplasm. The ribosomes then use this information to manufacture proteins through a process called translation. As a transient copy of specific genes, mRNA plays a crucial role in gene expression, influencing various biological processes like growth, development, immunity, and responses to environmental stimuli.

Explanation:

Moreover, mRNA-based vaccines, such as Pfizer-BioNTech and Moderna's COVID-19 vaccines, have revolutionized vaccine development, highlighting the significant impact of mRNA in medical advancements.

Step 2/4

It does not include an equal number of As and Ts:

This option is incorrect. However, in mRNA, uracil (U) replaces thymine (T) during transcription. The given mRNA sequence "TACCAGGATCACTTTGCCA" should be transcribed from the DNA sequence "ATGGTCTAGTGAAACGGT," where there is an equal number of adenine (A) and uracil (U) bases.

Explanation:

The mRNA contains an equal number of As and Us.

Step 3/4

It contains A:

This option is incorrect. mRNA naturally contains adenine (A) because adenine pairs with uracil (U) in RNA during transcription. The presence of adenine is a normal component of mRNA.

It does not include an equal number of Gs and Cs:

This option is incorrect.

Explanation:

In both DNA and RNA, guanine (G) always pairs with cytosine (C), so they should be present in equal numbers in the given mRNA sequence "TACCAGGATCACTTTGCCA."

Step 4/4

It contains T and not U:

This option is correct. The given mRNA sequence "TACCAGGATCACTTTGCCA" contains the base "T," which stands for thymine. However, mRNA should not have thymine (T) but rather uracil (U). During transcription, when the DNA is used as a template to create the mRNA strand, thymine is replaced by uracil.

Explanation:

The correct mRNA sequence for the given DNA sequence "TACCAGGATCACTTTGCCA" is "AUGGUCUAGUGAAAACGGA," where uracil (U) is used instead of thymine (T).

Final Answer

The correct option is "It contains T and not U" because thymine (T) is present in the given mRNA sequence, whereas it should be uracil (U) in mRNA. The other options are incorrect because adenine (A) is a normal part of mRNA, and both guanine (G) and cytosine (C) should be present in equal numbers in the mRNA sequence.

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