Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 9, Problem 10RQ
Control of gene expression in eukaryotic cells occurs at which level(s)?
a. only the transcriptional level
b. epigenetic and transcriptional levels
c. epigenetic, transcriptional, and translational levels
d. epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels
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What determines which transcription factors will be able to regulate a particular gene's expression?
A. The collection of control element sequences that are associated with that gene
B. The location of that gene sequence (which chromosome it is located on)
C. The sequence of introns present in that gene
D. The sequence of exons present in that gene
..
Why is regulating transcription the main way that cells control gene expression?
A.
Because transcription is the last step in gene expression, stopping here ensures that the cell has a stockpile of proteins to prepare them from all unexpected environmental changes.
B.
Because transcription involves interactions with DNA, preventing transcription reduces the changes of mutation in the cell’s genome.
C.
Because transcription is the first step in gene expression, stopping at transcription reduces the amount of energy and resources used by producing unnecessary gene products.
D.
Because transcription is the shortest step in gene expression, preventing transcription has little effect on the rate of protein production.
How is transcription directly controlled in eukaryotic cells?
a. through the use of phosphorylation
b. by means of apoptosis
c. using transcription factors and activators
d. when chromatin is packed to keep genes turned on
e. None of these are correct.
Chapter 9 Solutions
Concepts of Biology
Ch. 9 - Figure 9.10 You isolate a cell strain in which the...Ch. 9 - Which of the following does cytosine pair with? a....Ch. 9 - Prokaryotes contain a ______ chromosome, and...Ch. 9 - DNA replicates by which of the following models?...Ch. 9 - The initial mechanism for repairing nucleotide...Ch. 9 - A promoter is ______. a. a specific sequence of...Ch. 9 - Portions of eukaryotic mRNA sequence that are...Ch. 9 - The RNA components of ribosomes are synthesized in...Ch. 9 - How long would the peptide be that is translated...Ch. 9 - Control of gene expression in eukaryotic cells...
Ch. 9 - Post-translational control refers to: a....Ch. 9 - Describe the organization of the eukaryotic...Ch. 9 - Describe the structure and complementary base...Ch. 9 - How do the linear chromosomes in eukaryotes ensure...Ch. 9 - Transcribe and translate the following DNA...Ch. 9 - Describe how controlling gene expression will...
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- Epigenetic marks regulate gene expression. Which epigenetic mark is NOT associated with positive gene expression? A. Histone acetylation B. Histone Methylation C. De-methylated DNA D. Methylated DNAarrow_forwardWhat are epigenetic modifications? a. the addition of reversible changes to histone proteins and DNA b. the removal of nucleosomes from the DNA c. the addition of more nucleosomes to the DNA d. mutation of the DNA sequencearrow_forwardWhat will result from the binding of a transcription factor to an enhancer region? a. decreased transcription of an adjacent gene b. increased transcription of a distant gene c. alteration of the translation of an adjacent gene d. initiation of the recruitment of RNA polymerasearrow_forward
- Which of these is NOT true of nucleosomes? A. Some post-translational modifications to histone proteins serve as binding sites for transcription factors. B. The position of nucleosomes is fixed on the genome and can not be changed. C. The position and post-translational modifications of histones can be inherited through mitosis. D. The binding between DNA and histone proteins can be disrupted by post-translational modifications.arrow_forwardHow is the expression of genes controlled at the chromosomal level? A. DNA can synthesize extra histones as needed B. DNA can either be condensed into heterochromatin or decondensed into euchromatin C. DNA can be unwound into euchromatin to reduce the level of expression D. The expression of DNA can only be controlled at the transcriptional level E. DNA is spontaneously deleted from a chromosome if not neededarrow_forwardWhich of the following gene expression regulatory mechanisms saves the most energy but takes the longest to fully express the genes once signaled? a. transcriptional regulation b. post-transcriptional regulation c. post-translational regulation d. translational regulationarrow_forward
- What property prevents the ligands of cell-surface receptors from entering the cell? a. The molecules bind to the extracellular domain. b. The molecules are hydrophilic and cannot penetrate the hydrophobic interior of the plasma membrane. c. The molecules are attached to transport proteins that deliver them through the bloodstream to target cells. d. The ligands are able to penetrate the membrane and directly influence gene expression upon receptor binding.arrow_forwardWhich statement about transposons is INCORRECT? a.A transposon is a small fragment of DNA that can move from one location in a chromosome to another location in the same chromosome. b.Transposon insertion into a gene causes a mutation that can be reversed by removal of the transposon. c.Transposon movement often occurs when the cell is under genomic stress. d.In nature, insertion of a transposon can be deliberately added into a harmful gene to enhance survival.arrow_forwardCan one transcription factor sometimes act as a repressor and sometimes act as an activator? a. Yes, but it depends on where the transcription factor binds in the promoter b. Yes, but it depends on other proteins that might act with the transcription factor c. No, transcription factors are always either activators or repressors d. Yes, but only if a mutation happensarrow_forward
- What is the name of the process that adds a modified guanosine nucleotide to the 5’ phosphates of pre-mRNAs in eukaryotes? a. splicing b. polyadenylation c. capping d. nuclear export e. photophosphorylationarrow_forwardWhich of the following statament is NOT TRUE about gene expression?a. The expression of genes that code for proteins includes two stages: replication and translationb. Translation is the synthesis of a polypeptide using the information in the mRNA.c. During gene expression, the information encoded in genes is used to make specific polypeptide chains or RNA molecules.d. Gene expression is the process by which DNA directs the synthesis of proteinsarrow_forwardControl of gene expression in eukaryotic cells occurs at which level(s)? Lüffen birini seçin: a. epigenetic and transcriptional levels O b. post-transcriptional, translational, and post-translational levels O c. only the transcriptional level O d. epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels O e. epigenetic, transcriptional, and translational levelsarrow_forward
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