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Home Q & A Board Biology-Related Homework Help Biochemistry (Moderators: Nyntti, BurgaskO)
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The difference between dGMP and GMP is A) the type of phosphodiester linkage. B
The difference between dGMP and GMP is A) the type of phosphodiester linkage. B
The difference between dGMP and GMP is
A) the type of phosphodiester linkage.
B) one hydroxyl group.
C) syn versus anti conformation.
D) the presence of DNA or RNA.
mikael   902   3 Replies
A week ago
________ of specific RNA nucleotides in a process known as RNA editing is a mechanism of altering ...
________ of specific RNA nucleotides in a process known as RNA editing is a mechanism of altering ...
________ of specific RNA nucleotides in a process known as RNA editing is a mechanism of altering the protein product encoded by some genes in mammals.
alpsi   71   1 Reply
A month ago
________ are alternative mRNA structures that are produced by binding of a ________ which is often a ...
________ are alternative mRNA structures that are produced by binding of a ________ which is often a ...
________ are alternative mRNA structures that are produced by binding of a ________ which is often a product of a specific metabolic pathway.
alpsi   38   1 Reply
A month ago
RNA interference can be a mechanism of defense against viral infection as well as for regulation of ...
RNA interference can be a mechanism of defense against viral infection as well as for regulation of ...
RNA interference can be a mechanism of defense against viral infection as well as for regulation of gene expression.
T/F?
3493954   31   1 Reply
A month ago
MiRNAs are used in gene regulation to:A) block translation.B) target mRNA for degradation.C) cause ...
MiRNAs are used in gene regulation to:A) block translation.B) target mRNA for degradation.C) cause ...
miRNAs are used in gene regulation to:
A) block translation.
B) target mRNA for degradation.
C) cause ribosomes to stall.
D) promote degradation of polyA tails.
E) all of the above.
3493954   25   1 Reply
A month ago
Epigenetics is the heritable transmission of gene ________ patterns that does not involve a change ...
Epigenetics is the heritable transmission of gene ________ patterns that does not involve a change ...
Epigenetics is the heritable transmission of gene ________ patterns that does not involve a change in the DNA base sequence.
3493954   28   1 Reply
A month ago
ATPase domains of chromatin remodelers associated with transcriptionally active chromatin can ...
ATPase domains of chromatin remodelers associated with transcriptionally active chromatin can ...
ATPase domains of chromatin remodelers associated with transcriptionally active chromatin can contain a bromodomain that interacts specifically with ________ lysines or a chromodomain that interacts specifically with ________ histones.
3493954   21   1 Reply
A month ago
Transcriptionally active chromatin usually contains ________ histones, while ________ is normally ...
Transcriptionally active chromatin usually contains ________ histones, while ________ is normally ...
Transcriptionally active chromatin usually contains ________ histones, while ________ is normally inhibitory to transcription.
alpsi   19   1 Reply
A month ago
DNA methylation in eukaryotes:A) is part of the epigenetic process.B) occurs only on cytosine ...
DNA methylation in eukaryotes:A) is part of the epigenetic process.B) occurs only on cytosine ...
DNA methylation in eukaryotes:
A) is part of the epigenetic process.
B) occurs only on cytosine residues.
C) is maintained by specific DNA methyl transferases.
D) is inhibited by 5'-azacytidine.
E) all of the above.
alpsi   18   1 Reply
A month ago
Chromatin modifications that tend to inhibit transcription include:A) methylation at lysine 9 or 27 ...
Chromatin modifications that tend to inhibit transcription include:A) methylation at lysine 9 or 27 ...
Chromatin modifications that tend to inhibit transcription include:
A) methylation at lysine 9 or 27 of histone H3.
B) methylation at lysine 4 of histone H3.
C) ubiquitylation at lysine 119 of histone H3.
D) A, B, and C.
E) A
3493954   18   1 Reply
A month ago
In eukaryotes RNA polymerase is only bound at promoters that are carrying out active ...
In eukaryotes RNA polymerase is only bound at promoters that are carrying out active ...
In eukaryotes RNA polymerase is only bound at promoters that are carrying out active transcription.
T/F?
3493954   21   1 Reply
A month ago
Which of the following is NOT part of initiation of transcription in eukaryotes?A) Phosphorylation ...
Which of the following is NOT part of initiation of transcription in eukaryotes?A) Phosphorylation ...
Which of the following is NOT part of initiation of transcription in eukaryotes?
A) Phosphorylation of Ser-5 in the heptad repeats in the C-terminal domain of RNA polymerase II by TF-IIH.
B) Unwinding of the DNA template by TF-IIH
C) N
3493954   21   1 Reply
A month ago
Nucleosome remodeling complexes use ________ to drive changes in chromatin structure.
Nucleosome remodeling complexes use ________ to drive changes in chromatin structure.
Nucleosome remodeling complexes use ________ to drive changes in chromatin structure.
3493954   15   1 Reply
A month ago
All chromatin remodelling complexes are associated with activation of transcription.T/F?
All chromatin remodelling complexes are associated with activation of transcription.T/F?
All chromatin remodelling complexes are associated with activation of transcription.
T/F?
3493954   18   1 Reply
A month ago
Nucleosomes very close to the transcription start site in eukaryotes tend to have a high proportion ...
Nucleosomes very close to the transcription start site in eukaryotes tend to have a high proportion ...
Nucleosomes very close to the transcription start site in eukaryotes tend to have a high proportion of the histone variants H3.3 and H2A.Z.
T/F?
3493954   16   1 Reply
A month ago
The greater complexity of humans compared to worms and flies is due to:A) a greater number of ...
The greater complexity of humans compared to worms and flies is due to:A) a greater number of ...
The greater complexity of humans compared to worms and flies is due to:
A) a greater number of genes.
B) higher levels of alternative splicing.
C) a much greater number of transcription factors.
D) chromatin structure.
E) com
3493954   17   1 Reply
A month ago
The trp operon is transcribed when the trp repressor is bound to tryptophan.T/F?
The trp operon is transcribed when the trp repressor is bound to tryptophan.T/F?
The trp operon is transcribed when the trp repressor is bound to tryptophan.
T/F?
3493954   18   1 Reply
A month ago
A set of linked genes regulated by a common mechanism is called a regulon.T/F?
A set of linked genes regulated by a common mechanism is called a regulon.T/F?
A set of linked genes regulated by a common mechanism is called a regulon.
T/F?
3493954   17   1 Reply
A month ago
Which of the following BEST describes attenuation of the trp operon?A) The ribosome will stall at ...
Which of the following BEST describes attenuation of the trp operon?A) The ribosome will stall at ...
Which of the following BEST describes attenuation of the trp operon?
A) The ribosome will stall at adjacent trp codons if tryptophan levels in the cell are low.
B) High levels of tryptophan result in continued translation by the ribosome.
3493954   17   1 Reply
A month ago
Which of the following BEST describes the SOS response?A) DNA damage by UV light causes a λ lysogen ...
Which of the following BEST describes the SOS response?A) DNA damage by UV light causes a λ lysogen ...
Which of the following BEST describes the SOS response?
A) DNA damage by UV light causes a λ lysogen to be induced to the lytic life cycle.
B) It is an error prone DNA repair system.
C) Activation of RecA by sensing DNA damage and sing
alpsi   15   1 Reply
A month ago
The helix-turn-helix is a common protein motif that is able to interact with DNA in the major ...
The helix-turn-helix is a common protein motif that is able to interact with DNA in the major ...
The helix-turn-helix is a common protein motif that is able to interact with DNA in the major grooves by both electrostatic and specific interactions between amino acids of the helix and the bases of the DNA.
T/F?
alpsi   15   1 Reply
A month ago
The λ repressor is inactivated by proteolytic cleavage stimulated by the ________ protein.
The λ repressor is inactivated by proteolytic cleavage stimulated by the ________ protein.
The λ repressor is inactivated by proteolytic cleavage stimulated by the ________ protein.
alpsi   15   1 Reply
A month ago
Conformational changes in the cAMP receptor protein upon binding to cAMP trigger ________ of the lac ...
Conformational changes in the cAMP receptor protein upon binding to cAMP trigger ________ of the lac ...
Conformational changes in the cAMP receptor protein upon binding to cAMP trigger ________ of the lac operon in the presence of lactose.
3493954   15   1 Reply
A month ago
The affinity of the lac repressor for DNA ________ markedly when the inducer binds to the lac ...
The affinity of the lac repressor for DNA ________ markedly when the inducer binds to the lac ...
The affinity of the lac repressor for DNA ________ markedly when the inducer binds to the lac repressor.
alpsi   13   1 Reply
A month ago
________ mutants of the lac operon express β-galactosidase at high levels in the absence of an ...
________ mutants of the lac operon express β-galactosidase at high levels in the absence of an ...
________ mutants of the lac operon express β-galactosidase at high levels in the absence of an inducer, while ________ mutants of the lac operon express only very low levels of β-galactosidase even in the presence of inducer.
3493954   15   1 Reply
A month ago
The physiological inducer of the lac operon is ________.
The physiological inducer of the lac operon is ________.
The physiological inducer of the lac operon is ________.
alpsi   16   1 Reply
A month ago
The λ repressor can act as a transcriptional activator as well as a repressor.T/F?
The λ repressor can act as a transcriptional activator as well as a repressor.T/F?
The λ repressor can act as a transcriptional activator as well as a repressor.
T/F?
alpsi   16   1 Reply
A month ago
Catabolite or glucose repression of the lac operon is a regulatory system, which depends on the ...
Catabolite or glucose repression of the lac operon is a regulatory system, which depends on the ...
Catabolite or glucose repression of the lac operon is a regulatory system, which depends on the levels of cAMP in the cell.
T/F?
3493954   18   1 Reply
A month ago
A partial diploid containing a wild type allele for lacO and a lacO mutant that was unable to bind ...
A partial diploid containing a wild type allele for lacO and a lacO mutant that was unable to bind ...
A partial diploid containing a wild type allele for lacO and a lacO mutant that was unable to bind to the lac repressor would always express β-galactosidase.
T/F?
alpsi   19   1 Reply
A month ago
Which of the following BEST describes catabolite repression of the lac operon?A) The operon is ...
Which of the following BEST describes catabolite repression of the lac operon?A) The operon is ...
Which of the following BEST describes catabolite repression of the lac operon?
A) The operon is transcriptionally inactive in the absence of lactose.
B) The operon is transcriptionally inactivated by a repressor protein, which binds to gluc
3493954   19   1 Reply
A month ago
Which of the following is INCORRECT when considering the lac repressor?A) It is tetramer of two ...
Which of the following is INCORRECT when considering the lac repressor?A) It is tetramer of two ...
Which of the following is INCORRECT when considering the lac repressor?
A) It is tetramer of two dimers.
B) Binding to the operator site is cooperative.
C) Binding of each dimer is to different regions of the operator.
D) Binding
3493954   17   1 Reply
A month ago
A partial diploid containing a wild type allele for lacI and a lacI mutant that was unable to bind ...
A partial diploid containing a wild type allele for lacI and a lacI mutant that was unable to bind ...
A partial diploid containing a wild type allele for lacI and a lacI mutant that was unable to bind the inducer would:
A) always show low levels of β-galactosidase gene expression.
B) show normal induction in the presence of an inducer.
alpsi   19   1 Reply
A month ago
Which of the following BEST describes transcriptional regulation of the lac operon in E. coli?A) On ...
Which of the following BEST describes transcriptional regulation of the lac operon in E. coli?A) On ...
Which of the following BEST describes transcriptional regulation of the lac operon in E. coli?
A) On in the presence of lactose
B) On in the presence of lactose and presence of glucose
C) Off in the presence of glucose
D) On in th
alpsi   16   1 Reply
A month ago
The fusion of vesicles, from the Golgi complex, with specific membranes is facilitated by ________ ...
The fusion of vesicles, from the Golgi complex, with specific membranes is facilitated by ________ ...
The fusion of vesicles, from the Golgi complex, with specific membranes is facilitated by ________ protein pairs called t-SNARES and v-SNARES on membranes as well as cytosolic fusion proteins.
3493954   15   1 Reply
A month ago
Nuclear encoded proteins destined for ________, chloroplasts or nuclei are synthesized in the ...
Nuclear encoded proteins destined for ________, chloroplasts or nuclei are synthesized in the ...
Nuclear encoded proteins destined for ________, chloroplasts or nuclei are synthesized in the cytoplasm.
3493954   17   1 Reply
A month ago
Glycosylated proteins are synthesized on rough endoplasmic reticulum.T/F?
Glycosylated proteins are synthesized on rough endoplasmic reticulum.T/F?
Glycosylated proteins are synthesized on rough endoplasmic reticulum.
T/F?
alpsi   14   1 Reply
A month ago
Which of the following does NOT apply to proteins synthesized on the rough endoplasmic reticulum?A) ...
Which of the following does NOT apply to proteins synthesized on the rough endoplasmic reticulum?A) ...
Which of the following does NOT apply to proteins synthesized on the rough endoplasmic reticulum?
A) Signal recognition particle
B) Vesicular transport
C) Signal sequence cleavage
D) Continuous translation
E) Docking protein
3493954   13   1 Reply
A month ago
Which of the following BEST describes the transport of nuclear proteins across the nuclear ...
Which of the following BEST describes the transport of nuclear proteins across the nuclear ...
Which of the following BEST describes the transport of nuclear proteins across the nuclear membrane?
A) Simple diffusion
B) An N-terminal targeting sequence that is cleaved during transport
C) A targeting sequence that interacts with a
alpsi   12   1 Reply
A month ago
Which of the following applies only to prokaryotic proteins?A) Secreted proteins have signal ...
Which of the following applies only to prokaryotic proteins?A) Secreted proteins have signal ...
Which of the following applies only to prokaryotic proteins?
A) Secreted proteins have signal sequences in their N-terminal regions.
B) Some proteins are covalently modified after translation.
C) Hydrophilic proteins are able to either
3493954   14   1 Reply
A month ago
Antibiotics that inhibit translation are useful because:A) the translational machinery of eukaryotes ...
Antibiotics that inhibit translation are useful because:A) the translational machinery of eukaryotes ...
Antibiotics that inhibit translation are useful because:
A) the translational machinery of eukaryotes is sufficiently different to that of bacteria.
B) microorganisms can develop resistance to other antibiotics.
C) antibiotic resistanc
3493954   16   1 Reply
A month ago
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Home Q & A Board Biology-Related Homework Help Biochemistry (Moderators: Nyntti, BurgaskO)