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In prokaryotes, control of gene expression usually occurs at the
a. splicing of pre-mRNA into mature mRNA.
b. initiation of translation.
c. initiation of transcription.
d. All of the choices are correct.
Introduction:
The genes can be defined as the sequence of the nucleotides, which codes for the function in a genome. It could be DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). There are certain genes which express continuously in all the cells, these are known as the housekeeping genes. The expression of other kinds of genes is regulated.
Answer to Problem 1U
Correct answer:
In prokaryotes, the expression of the gene is usually regulated at the initiation of transcription. Therefore, option c is correct.
Explanation of Solution
Reasons for the correct statement:
The regulation of the expression of the genes is regulated at different stages. The genetic information from the DNA is passed on to the
Option c is given as “initiation of transcription”.
As, “the regulation of the gene expression in prokaryotes occurs at the initiation of the transcription”, is the right answer.
Hence, option c is correct.
Reasons for the incorrect statements:
Option a is given as “splicing of pre-
The splicing is the process through which the heterogeneous or pre-
Option b is given as “initiation of translation”.
In some of the prokaryotes, the control of the gene expression occurs at the initiation of the translation; however, it is not very common. So, it is a wrong answer.
Option d is given as “all of the choices are correct”.
The splicing is not the regulatory mechanism and the regulation at the initiation of the translation occurs in some genes. So, it is a wrong answer.
Hence, the options a, b, and d are incorrect.
The regulation of the gene takes place at the level of initiation of transcription mostly. This kind of regulation is the most studied. The regulation of the gene allows the differential expression of the proteins.
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Chapter 16 Solutions
EBK BIOLOGY
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