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प्रश्न
Sometimes cattle or even human beings give birth to their young ones that are having extremely different sets of organs like limbs/position of eye(s) etc. Comment.
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उत्तर
There is a disturbance in co-ordinated regulation of the expression of sets of genes associated with organ development.
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संबंधित प्रश्न
When lactose is present in the culture medium:
In E.coli, three enzymes β- galactosidase, permease and transacetylase are produced in the presence of lactose. Explain why the enzymes are not synthesized in the absence of lactose.
Identify the process described in the following paragraph.
Repressible regulation of gene is seen when the end product of a biosyntbetic pathway like amino acid, is provided in the medium. At this time, internal biosynthesis of amino acid stops. It is negative control so the metabolite (amino acid) turns off a set of genes involved in producing that metabolite.
Which of the following factors regulate gene expression?
Genes that are involved in turning on or off the transcription of a set of structural genes are called ______.
The gene which codes for enzyme β-galactosidase ______.
The image below shows the result of plating bacteria in a chromogenic medium after incorporating the gene of interest in the plasmid. Some plates had blue colonies; some plates had white colonies. A single bacterium extracted from Plate I, II, and III is shown below:
On the basis of your observations:
- Identify the plate(s) which is/are white. Give a reason.
- Identify the plate(s) which is/are blue. Give a reason.
Which of the following are the post-transcriptional events in an eukaryotic cell?
- Transport of pre-mRNA to cytoplasm prior to splicing.
- Removal of introns and joining of exons.
- Addition of methyl group at 5' end of hnRNA.
- Addition of adenine residues at 3' end of hnRNA.
- Base pairing of two complementary RNAs.
Choose the correct answer from the options given below:
Match List I with List II:
| List I | List II |
| A. Gene ‘a’ | I. β-galactosidase |
| B. Gene ‘y’ | II. Transacetylase |
| C. Gene ‘i’ | III. Permease |
| D. Gene ‘z’ | IV. Repressor protein |
Choose the correct answer from the options given below:
Which of the following best describes gene regulation?
Gene regulation can be described as switching genes ON or OFF according to which two factors?
At how many levels can gene regulation occur in eukaryotes?
Which level of gene regulation involves the formation of the primary transcript in eukaryotes?
What enzyme does Escherichia coli produce to break down lactose?
What are the two products formed when E. coli β-galactosidase breaks down lactose?
What term describes the process by which inducible enzymes are produced?
Which type of control is exemplified by feedback repression?
