The equivalent of a structural gene is -
- muton
- cistron
- operon
- recon
The Correct Option is B
Solution and Explanation
The correct answer is Option 2: cistron.
Explanation:
Cistron refers to a segment of DNA that encodes a specific protein or functional RNA. In other words, a cistron is the functional unit of a gene, and it is essentially equivalent to what we call a structural gene, as it codes for a particular protein or part of a protein.
Muton: A muton refers to the smallest mutational unit that can cause a genetic change. It is not equivalent to a structural gene.
Operon: An operon is a group of genes in bacteria that are regulated together and usually function in a related manner. The operon includes both structural genes and the regulatory elements that control their expression, so it is broader than a single structural gene.
Recon: A recon is the smallest unit of recombination that can be studied in a genetic analysis. It is not equivalent to a structural gene.
Thus, cistron is the correct term to describe the equivalent of a structural gene.
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Questions Asked in NEET exam
- Identify the set of correct statement:
A. The flowers of Vallisneria are colourful and produce nectar.
B. The flowers of waterlily are not pollinated by water.
C. In most of water-pollinated species, the pollen grains are protected from wetting.
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B. It may get integrated into the genome of the recipient.
C. It may multiple and be inherited along with the host DNA.
D. The alien piece of DNA is not an integral part of chromasame.
E. It shows ability to replicate.
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Concepts Used:
Transcription
The very first stage of gene expression is the procedure of transcription. In this procedure, mRNA is the place where the genetic information is stored which later aids in encoding a protein. In this process, the DNA strand acts as a guide in the making of mRNA. Despite the fact that there is one exception which is adenine base pairs with uracil instead of thymine.
Transcription Unit:
The transcription unit is a set of freshly combined RNA molecules that have been transcribed from DNA. The cause is to encode at least one gene. A protein that has been encoded or encrypted with a DNA transcription unit may have a coding sequence. Transcription has a lower copying fidelity rate when differentiated from DNA replication.
The Stages of Transcription:
The procedure of transcription is enzymatically catalyzed into three steps:
- Initiation
- Elongation
- Termination