Concept explainers
Videos
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.
Want to see more full solutions like this?
Chapter 16 Solutions
BIOLOGY W/CONNECT >IP<
- Within a cell, the amount of protein made using a given mRNA molecule depends partly on A. the presence of certain transcription factors. B. the rate at which the mRNA is degraded. C. the degree of DNA methylation. D. the number of introns present in the mRNA. please explain which is correct and incorrect and whyarrow_forwardPost-translational modifications of proteins can affect which of the following? a. protein function b. transcriptional regulation c. chromatin modification d. all of the abovearrow_forwardWhat is the genetic code? a. The relationship between a three-base codon sequence and an amino acid or the end of translation b. The entire base sequence of an mRNA molecule c. The entire sequence from the promoter to the terminator of a gene d. The binding of tRNA to mRNAarrow_forward
- When would a ribosome bind to a promoter sequence? A) It wouldn't. A promoter is a DNA sequence, and ribosomes don't bind to DNA. B) When the ribosome needs to transcribe the gene that that promoter controls. C) When the ribosome is translating the DNA sequence of a gene. D) When there is a start codon (AUG) in the promoter sequence. .arrow_forwardWhich of the following is the best description of a transcription factor? A. A protein that brings the correct nucleotides to RNA polymerase B. A protein that binds to specific DNA sequences C. A DNA sequence that binds to RNA polymerase D. A modification that is made to mRNA to help it be exported from the nucleus. .arrow_forwardA mutation that changes the sequence of nucleotides in a promoter would result in a change in a. The amino acid sequence of the corresponding protein b. The base sequence of the corresponding mRNA c. How frequently the corresponding gene is transcribed d. The fidelity of translation of the corresponding mRNA 1 pointsarrow_forward
- What process is the P site in a ribosome most closely associated with? a. Binds the tRNA molecule carrying the next needed amino acid to the mRNA strand b. Transcription of DNA to RNA c. Release of a tRNA molecule from a ribosome d. Anchoring of the tRNA holding the growing polypeptidearrow_forwardhow does eukaryotic ribosome find the mRNA to be translated? A. the sigma factor B. the shine-Dalgarno sequence C. the Inr sequence D. the 5'caparrow_forwardIn 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.arrow_forward
- The formation of peptide bonds between amino acids occurs _____. a. during transcription b. during the elongation step to translation c. during the assemble of the ribosome and mRNA d. while DNA is being replicatedarrow_forwardThe ribosome is needed for translation of mRNA (a) because it has the enzyme for adding amino acids to the 5’ end of a tRNA (b) because the ribosomal RNA contains the codon which determines the sequence of amino acids in a protein (c) because it positions tRNA and mRNA so that correct pairing of codon and anti-codon can occur (d) because it has an enzyme that removes introns from mRNA (e) all of the abovearrow_forwardWhich of the following best describes mRNA?Group of answer choices a) Complexes with ribosomal proteins to form ribosomes b) Transports amino acids to ribosomes during translation c) Provides the instructions for the amino acid sequence of a polypeptide d) Used for eukaryotic RNA processingarrow_forward
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College