× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
Embryology, epigenetics, prenatal development, etc.
New Topic  
Subject
Last post
A DNA-binding motif that is characterized by its amphipathic nature is a:
A DNA-binding motif that is characterized by its amphipathic nature is a:
A DNA-binding motif that is characterized by its amphipathic nature is a:

▸ homeodomain.

▸ helix-turn-helix domain.

▸ helix-loop-helix domain.

▸ zinc finger.

▸ steroid receptor.
djchewinggum   41   1 Reply
A year ago
Which of the following is the order of gene expression for establishment of the bacteriophage lambda ...
Which of the following is the order of gene expression for establishment of the bacteriophage lambda ...
[html]Which of the following is the order of gene expression for establishment of the bacteriophage lambda lysogenic pathway upon infection of a wild-type host?

▸ N → Q → cII/cIII → cI

▸ N → cI → cII/cIII

▸ N → cro → cI → cII/cIII

▸ N → cII/cIII
wilcoxj49   38   1 Reply
A year ago
What lambda phage gene products are required for maintenance of the lambda repressor?
What lambda phage gene products are required for maintenance of the lambda repressor?
What lambda phage gene products are required for maintenance of the lambda repressor?

▸ cI and cII

▸ cII and cIII

▸ cI and cIII

▸ cI, cII, and cIII

▸ cI only
ssi15   29   1 Reply
A year ago
What lambda phage gene products are required for establishment of the lambda repressor?
What lambda phage gene products are required for establishment of the lambda repressor?
What lambda phage gene products are required for establishment of the lambda repressor?

▸ cI and cII

▸ cII and cIII

▸ cI and cIII

▸ cI, cII, and cIII

▸ cro, cI, and cIII
Heybonita   31   1 Reply
A year ago
What is the most critical factor in determining whether a bacteriophage lambda infection of a ...
What is the most critical factor in determining whether a bacteriophage lambda infection of a ...
[html]What is the most critical factor in determining whether a bacteriophage lambda infection of a susceptible host progresses into the lytic or lysogenic pathway?

▸ The level of cI protein present in the cell

▸ The level of cII protein present in
Zergnet   35   1 Reply
A year ago
What factor is needed for transcription of the phage lambda late genes?
What factor is needed for transcription of the phage lambda late genes?
What factor is needed for transcription of the phage lambda late genes?

▸ cro protein

▸ cI protein

▸ int protein

▸ pN protein

▸ pQ protein
mb83   44   1 Reply
A year ago
Transcription from the phage lambda PRM promoter requires which of the following factors?
Transcription from the phage lambda PRM promoter requires which of the following factors?
Transcription from the phage lambda PRM promoter requires which of the following factors?

▸ cro

▸ cI

▸ cII

▸ cIII

▸ cIV
doggerfresh   37   1 Reply
A year ago
The lambda repressor functions as a:
The lambda repressor functions as a:
The lambda repressor functions as a:

▸ monomer.

▸ dimer.

▸ trimer.

▸ tetramer.

▸ hexamer.
rsteel   31   1 Reply
A year ago
In a wild-type bacterial cell, how many copies of the lambda prophage can be present in the chromosome?
In a wild-type bacterial cell, how many copies of the lambda prophage can be present in the chromosome?
In a wild-type bacterial cell, how many copies of the lambda prophage can be present in the chromosome?

▸ None

▸ One

▸ Two

▸ Three

▸ Four or more
Bluffinmuffin   41   1 Reply
A year ago
Expression of the bacteriophage lambda cro protein is repressed when:
Expression of the bacteriophage lambda cro protein is repressed when:
[html]Expression of the bacteriophage lambda cro protein is repressed when:

▸ OR1 is occupied.

▸ OR2 is occupied.

▸ OR3 is occupied.

▸ OR4 is occupied.

▸ OR3 and OR4 are occupied.
adnan_buljic   39   1 Reply
A year ago
Expression of the bacteriophage lambda cI protein is repressed when:
Expression of the bacteriophage lambda cI protein is repressed when:
[html]Expression of the bacteriophage lambda cI protein is repressed when:

▸ OR1 is occupied.

▸ OR2 is occupied.

▸ OR3 is occupied.

▸ OR4 is occupied.

▸ OR3 and OR4 are occupied.[
js56154   42   1 Reply
A year ago
The lac repressor functions as a(n):
The lac repressor functions as a(n):
The lac repressor functions as a(n):

▸ monomer.

▸ dimer.

▸ tetramer.

▸ hexamer.

▸ octamer.
Dante52   34   1 Reply
A year ago
The lac repressor binds to the:
The lac repressor binds to the:
The lac repressor binds to the:

▸ RNA polymerase and not to DNA.

▸ inducer of the lac operon only.

▸ minor groove of DNA.

▸ major groove of DNA.

▸ both minor and major grooves of DNA.
jadinh   29   1 Reply
A year ago
The lac mRNA is:
The lac mRNA is:
[html]The lac mRNA is:

▸ extremely unstable with a half-life of ~20 seconds.

▸ extremely unstable with a half-life of ~1 minute.

▸ extremely unstable with a half-life of ~3 minutes.

▸ very stable with a half-life of ~15 minutes.

▸ very st
briemert2013   25   1 Reply
A year ago
The entry of uncharged tRNA into the ribosomal A site triggers what reaction?
The entry of uncharged tRNA into the ribosomal A site triggers what reaction?
The entry of uncharged tRNA into the ribosomal A site triggers what reaction?

▸ Initiation reaction

▸ Allosteric reaction

▸ Acetylation reaction

▸ Induction response

▸ Stringent response
Dante52   26   1 Reply
A year ago
The binding of lac repressor to more than one operator causes a _______ in the DNA.
The binding of lac repressor to more than one operator causes a _______ in the DNA.
The binding of lac repressor to more than one operator causes a _______ in the DNA.

▸ nick

▸ loop

▸ knot

▸ break

▸ rosette
xiaoyu000   34   1 Reply
A year ago
In a wild-type bacterial cell, the normal inducer of the lac operon is:
In a wild-type bacterial cell, the normal inducer of the lac operon is:
In a wild-type bacterial cell, the normal inducer of the lac operon is:

▸ lactose.

▸ allolactose.

▸ glucose.

▸ IPTG.

▸ Xgal.
Ryan37sport   41   1 Reply
A year ago
How many total operator sequences are located in the lac operon?
How many total operator sequences are located in the lac operon?
How many total operator sequences are located in the lac operon?

▸ 1

▸ 2

▸ 3

▸ 4

▸ 5
anonkah   36   1 Reply
A year ago
An example of a trans-acting element is:
An example of a trans-acting element is:
[html]An example of a trans-acting element is:

▸ the lac operator only.

▸ the lac repressor only.

▸ the CRP activator only.

▸ both the lac repressor and the CRP activator.

▸ the lac operator, the lac rep
tsk   30   1 Reply
A year ago
An example of a protein product that binds to its own mRNA to prevent translation initiation is:
An example of a protein product that binds to its own mRNA to prevent translation initiation is:
An example of a protein product that binds to its own mRNA to prevent translation initiation is:

▸ ribosomal protein.

▸ T4 phage p32 protein.

▸ tubulin protein.

▸ the lac repressor.

▸ the LacA protein.
melisooflyy   24   1 Reply
A year ago
An example of a cis-dominant mutation is:
An example of a cis-dominant mutation is:
An example of a cis-dominant mutation is:

▸ lacI-.

▸ lacIS.

▸ lacZ-.

▸ lacOc.

▸ lacO-.
waterman7833   27   1 Reply
A year ago
True or False? Ribosomes always stay in a single triplet reading frame during a translation event.
True or False? Ribosomes always stay in a single triplet reading frame during a translation event.
True or False? Ribosomes always stay in a single triplet reading frame during a translation event.

▸ true

▸ false
alireads   32   1 Reply
A year ago
Wyosine is a modification of which base?
Wyosine is a modification of which base?
Wyosine is a modification of which base?

▸ Cytidine

▸ Uridine

▸ Adenosine

▸ Guanosine

▸ Inosine
kaykay41   39   1 Reply
A year ago
What was the first codon to be identified?
What was the first codon to be identified?
What was the first codon to be identified?

▸ UUU, which encodes phenylalanine

▸ AUG, which encodes methionine

▸ GGG, which encodes glycine

▸ UAG, which is a termination codon

▸ UGA, which is a termination codon
exteesy07   51   1 Reply
A year ago
What is the typical number of aminoacyl tRNA synthetases found in a cell?
What is the typical number of aminoacyl tRNA synthetases found in a cell?
What is the typical number of aminoacyl tRNA synthetases found in a cell?

▸ 12

▸ 18

▸ 23

▸ 61

▸ 64
hellchicken   33   1 Reply
A year ago
Pyrrolysine is inserted for which of the following codons in some bacteria and an archaean?
Pyrrolysine is inserted for which of the following codons in some bacteria and an archaean?
Pyrrolysine is inserted for which of the following codons in some bacteria and an archaean?

▸ AAG

▸ AGA

▸ UAG

▸ UGA

▸ GAG
eennuson   40   1 Reply
A year ago
Modification of uracil to thiouracil in a tRNA anticodon prevents this base from forming a wobble ...
Modification of uracil to thiouracil in a tRNA anticodon prevents this base from forming a wobble ...
Modification of uracil to thiouracil in a tRNA anticodon prevents this base from forming a wobble base pair with:

▸ G.

▸ A.

▸ T.

▸ C.

▸ I.
sam3359   48   1 Reply
A year ago
How many different types of modified bases can be found in tRNA molecules?
How many different types of modified bases can be found in tRNA molecules?
How many different types of modified bases can be found in tRNA molecules?

▸ Less than 12

▸ About 20

▸ About 30

▸ About 40

▸ At least 81
aeropa84   42   1 Reply
A year ago
How many amino acids are encoded by six different codons?
How many amino acids are encoded by six different codons?
How many amino acids are encoded by six different codons?

▸ 0

▸ 1

▸ 2

▸ 3

▸ 4
lvnrn2012   29   1 Reply
A year ago
According to the wobble hypothesis, what is the minimum number of tRNAs (excluding the initiator) ...
According to the wobble hypothesis, what is the minimum number of tRNAs (excluding the initiator) ...
According to the wobble hypothesis, what is the minimum number of tRNAs (excluding the initiator) required to recognize all 61 codons?

▸ 20

▸ 31

▸ 46

▸ 61

▸ 64
teranine   33   1 Reply
A year ago
A C in the first position of an anticodon can base pair with:
A C in the first position of an anticodon can base pair with:
A C in the first position of an anticodon can base pair with:

▸ U only.

▸ G only.

▸ A or G.

▸ C or U.

▸ A, G, or U.
Kss612   30   1 Reply
A year ago
True or False? Transcription and translation occur simultaneously in bacteria.
True or False? Transcription and translation occur simultaneously in bacteria.
True or False? Transcription and translation occur simultaneously in bacteria.

▸ true

▸ false
Katie32   31   1 Reply
A year ago
Which of the following codons is never associated with serving as an initiation codon for ...
Which of the following codons is never associated with serving as an initiation codon for ...
Which of the following codons is never associated with serving as an initiation codon for translation in bacteria?

▸ AUG

▸ GUG

▸ UUG

▸ CUG

▸ CUG, GUG, and UUG
bklm1234   26   1 Reply
A year ago
Which of the following antibiotics is an amino acid analog?
Which of the following antibiotics is an amino acid analog?
Which of the following antibiotics is an amino acid analog?

▸ Puromycin

▸ Kirromycin

▸ Ampicillin

▸ Streptomycin

▸ Tetracycline
mlee52381   32   1 Reply
A year ago
Which antibiotic specifically inhibits the function of EF-Tu?
Which antibiotic specifically inhibits the function of EF-Tu?
Which antibiotic specifically inhibits the function of EF-Tu?

▸ Puromycin

▸ Tetracycline

▸ Ampicillin

▸ Streptomycin

▸ Kirromycin
shbensonjr   25   1 Reply
A year ago
What is typically the slowest step of translation?
What is typically the slowest step of translation?
What is typically the slowest step of translation?

▸ Initiation

▸ Elongation

▸ Translocation

▸ Termination

▸ All steps occur at about the same rate.
usmc2rn   20   1 Reply
A year ago
What is the primary source of energy for translation in bacteria?
What is the primary source of energy for translation in bacteria?
What is the primary source of energy for translation in bacteria?

▸ NADH

▸ ATP

▸ UTP

▸ CTP

▸ GTP
jtfortwengler   33   1 Reply
A year ago
What is the most common start codon used for initiation of translation in bacteria?
What is the most common start codon used for initiation of translation in bacteria?
What is the most common start codon used for initiation of translation in bacteria?

▸ AUG

▸ CUG

▸ GUG

▸ UGU

▸ AGU
booboo123   28   1 Reply
A year ago
In bacteria, a ribosome binds about how many bases in a transcript at any point during translation?
In bacteria, a ribosome binds about how many bases in a transcript at any point during translation?
In bacteria, a ribosome binds about how many bases in a transcript at any point during translation?

▸ 3

▸ 6

▸ 18

▸ 35

▸ 42
extrl83   36   1 Reply
A year ago
How many binding sites for tRNAs are present in each ribosome?
How many binding sites for tRNAs are present in each ribosome?
How many binding sites for tRNAs are present in each ribosome?

▸ 1

▸ 2

▸ 3

▸ 4

▸ 5
lpn27   25   1 Reply
A year ago
New Topic  
Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
Explore
Post your homework questions and get free online help from our incredible volunteers
  1291 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Gallery
  
 770
  
 203
  
 538