Question

All of the following are examples of ribozymes or ribozyme activity except?

1) peptidyl transferase
2) autocatalytic RNAs
3) ribonuclease P
4) intron removal from pre-rRNA
5) zymogen

Answer 1

The correct answer is zymogen. Ribozymes are RNA molecules that can act as enzymes. Examples of ribozymes include peptidyl transferase, autocatalytic RNAs, ribonuclease P, and intron removal from pre-rRNA.Option 5 is the correct answer.

Step-by-step explanation:

The correct answer is 5) zymogen.

A ribozyme is a ribonucleic acid (RNA) molecule that can act as an enzyme and catalyze chemical reactions. Examples of ribozymes or ribozyme activity include:

1. Peptidyl transferase: This ribozyme component of the ribosome links incoming amino acids to a growing polypeptide chain during protein synthesis.
2. Autocatalytic RNAs: These are self-replicating RNAs that can catalyze their own replication.
3. Ribonuclease P: This ribozyme is involved in the processing of transfer RNA (tRNA) molecules.
4. Intron removal from pre-rRNA: During the processing of pre-ribosomal RNA, introns are removed by a ribozyme.

Zymogen refers to an inactive precursor form of an enzyme that requires activation.

The correct answer, zymogen, corresponds to an inactive precursor form of an enzyme necessitating activation. In contrast, a ribozyme is an RNA molecule capable of exhibiting enzyme-like catalytic functions. Prominent examples include peptidyl transferase, pivotal in linking amino acids during protein synthesis within ribosomes, autocatalytic RNAs for self-replication, Ribonuclease P engaged in tRNA processing, and the removal of introns from pre-rRNA.

While ribozymes showcase RNA's enzymatic potential, a zymogen signifies an enzymatic precursor awaiting conversion into an active form. This distinction highlights the diverse roles of RNA in cellular processes, both as a catalytic agent and as a precursor to functional enzymes.