Cell Biology

How is MRNA single stranded when it is added to a complementary DNA strand?

How is MRNA single stranded when it is added to a complementary DNA strand?

When RNA is added to a complementary DNA strand, How is Mrna single stranded? If it was added to the DNA strand wouldn't it be double stranded?

julie7   530   2 Replies

rkbrookover

Why does the mRNA transcribed from exon 10 not have a start and stop codon?

Why does the mRNA transcribed from exon 10 not have a start and stop codon?

can somebody please explain this? I can't seem to find the answer anywhere& this is for the cystic fibrosis transmembrane regulator gene (CFTR)

julie7   618   2 Replies

rjcool123

How many bases or nucleotides of mRNA are responsible for the coding of one amino acid?

How many bases or nucleotides of mRNA are responsible for the coding of one amino acid?

can you please answer these also :

1. what are the four nucleotides presnet in tRNA?
2. do these bases differ from those found in mRNA?
3. what base in mRNA can only match with the :
a. adenine base of tRNA
b. uracil base of tRNA
c. cytosine base of

julie7   1070   1 Reply

davemustane89

Introns are: Answer the start signal in a mRNA strand a base sequence that signals the start of a gene?

Introns are: Answer the start signal in a mRNA strand a base sequence that signals the start of a gene?

Introns are:
Answer
 A. the start signal in a mRNA strand
 B. a base sequence that signals the start of a gene
 C. the coding region of a gene
 D. the non-coding region of a gene

julie7   1086   4 Replies

Testman

How do anchored subunits of G Protein dissociate into cell if they're bound to a receptor?

How do anchored subunits of G Protein dissociate into cell if they're bound to a receptor?

So, what happens is, the alpha subunit within Gprotein binds to GTP, and then it dissociates from the Gprotein, while the gamma and beta subunits form a dimer.  this gamma/beta complex, and the alpha subunit will go on and bind to different cellular

julie7   527   2 Replies

toms.girl

What effect does the transmission of a muscle fiber action potential traveling to the sarcoplasmic reticulum..?

What effect does the transmission of a muscle fiber action potential traveling to the sarcoplasmic reticulum..?

What effect does the transmission of a muscle fiber action potential traveling to the sarcoplasmic reticulum have on the pathway leading to muscle contraction?

A. The sarcoplasmic reticulum releases calcium into the cytoplasmic fluid surrounding the

JulieA   765   2 Replies

julie

What is actually a déjà vu?

What is actually a déjà vu?

Any recent findings about this stuff? I'm sure I've gone through something as it happened once, but I think it's just a short circuit of the neurons transmission system in the brain that makes a current environment seems to be related to something al

JulieA   286   4 Replies

iladelph

Which is the best method for determining bacteriophage concentration in a sample?

Which is the best method for determining bacteriophage concentration in a sample?

A. Spectrophotometer
B. Plaque assay
C. Light Microscope (LM)
D. Animal inoculation
E. Biochemical tests

...AND WHY? Please explain your answer if you can. would be appreciated. Thanks.

JulieA   879   2 Replies

firepain

What Happens to the Protein Coat of a Bacteriophage After it Injects its DNA into a Bacteria Cell?

What Happens to the Protein Coat of a Bacteriophage After it Injects its DNA into a Bacteria Cell?

We are learing about the lytic and lysogenic cycles in AP Biology, and I asked my teacher this same question, and she didn't know, and she told me to find out(probably for extra credit) If you can answer, and provide a website that explains(no offens

JulieA   382   1 Reply

rjcool123

The most common source of Escherichia spp. food poisoning is contaminated

The most common source of Escherichia spp. food poisoning is contaminated

The most common source of Escherichia spp. food poisoning is contaminated
A) meat.
B) fruits.
C) grains.
D) milk and milk products.

JulieCarde   27   3 Replies

rosepolzin

The EIA test for HIV infection is a direct test for HIV envelope proteins.

The EIA test for HIV infection is a direct test for HIV envelope proteins.

The EIA test for HIV infection is a direct test for HIV envelope proteins.
[True or False]

JulieCarde   21   3 Replies

guarnere

Dendritic cells are phagocytes with antigen-presenting properties.

Dendritic cells are phagocytes with antigen-presenting properties.

Dendritic cells are phagocytes with antigen-presenting properties.
[True or False]

JulieCarde   39   2 Replies

JulieCarde

Why is fever a common result of endotoxin exposure?

Why is fever a common result of endotoxin exposure?

Why is fever a common result of endotoxin exposure?

JulieCarde   41   2 Replies

JulieCarde

Which study set out to generate genomic sequences from 200 strains of bacteria isolated from the human body?

Which study set out to generate genomic sequences from 200 strains of bacteria isolated from the human body?

Which study set out to generate genomic sequences from 200 strains of bacteria isolated from the human body?
A) the Human Microbiome Project
B) NIH JumpStart Program
C) MetaGenoPolis
D) the Integrative Human Microbiome Project

JulieCarde   39   2 Replies

JulieCarde

What is the difference between a primary and secondary insect symbiont? Propose how you might use an ...

What is the difference between a primary and secondary insect symbiont? Propose how you might use an ...

What is the difference between a primary and secondary insect symbiont? Propose how you might use an insect symbiont to control the spread of an insect-borne disease.

JulieCarde   22   2 Replies

JulieCarde

Gut symbionts are lost after each molting a termite undergoes.

Gut symbionts are lost after each molting a termite undergoes.

Gut symbionts are lost after each molting a termite undergoes.
[True or False]

JulieCarde   30   2 Replies

JulieCarde

Subway air and water distribution systems harbor dangerous levels of pathogenic microorganisms.

Subway air and water distribution systems harbor dangerous levels of pathogenic microorganisms.

Subway air and water distribution systems harbor dangerous levels of pathogenic microorganisms.
[True or False]

JulieCarde   26   3 Replies

Briellec99

One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that

One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that

One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that
A) P, Ca, and Si are NOT cycled in terrestrial environments.
B) the P, Ca, and Si cycles do NOT involve redox changes or gaseous forms that can alter Earth

JulieCarde   34   2 Replies

JulieCarde

Due to the slow and varied growth rates, mycobacteria are commonly grouped into either slow growing ...

Due to the slow and varied growth rates, mycobacteria are commonly grouped into either slow growing ...

Due to the slow and varied growth rates, mycobacteria are commonly grouped into either slow growing or very slow growing, which has consequences on the growth medium selected for culturing.
[True or False]

JulieCarde   60   1 Reply

dalililah1

Treating wastewater requires the removal of organic material, and an ideal phenotype of a bacterium ...

Treating wastewater requires the removal of organic material, and an ideal phenotype of a bacterium ...

Treating wastewater requires the removal of organic material, and an ideal phenotype of a bacterium to do this would flocculate to make the cells settle (rather than staying in suspension) in a wastewater stream. Which species would be best for this

JulieCarde   29   2 Replies

JulieCarde

Bacteria that are capable of oxidizing both iron and sulfur usually have a strong preference for ...

Bacteria that are capable of oxidizing both iron and sulfur usually have a strong preference for ...

Bacteria that are capable of oxidizing both iron and sulfur usually have a strong preference for sulfur oxidation because it yields more energy.
[True or False]

JulieCarde   36   1 Reply

alejomm21

Consider a mutation in which the change is from UAC to UAU. Both codons specify the amino acid ...

Consider a mutation in which the change is from UAC to UAU. Both codons specify the amino acid ...

Consider a mutation in which the change is from UAC to UAU. Both codons specify the amino acid tyrosine. Which type of point mutation is this?
A) silent mutation
B) nonsense mutation
C) missense mutation
D) frameshift mutation

JulieCarde   27   2 Replies

JulieCarde

Polyproteins made from human viruses such as poliovirus must be ________ in order to yield the ...

Polyproteins made from human viruses such as poliovirus must be ________ in order to yield the ...

Polyproteins made from human viruses such as poliovirus must be ________ in order to yield the required functional units of the virus.
A) able to interact with VPg proteins
B) chemically modified with either glycolation or methylation
C) post-tran

JulieCarde   27   2 Replies

JulieCarde

The cell membranes of thermophiles and hyperthermophilic bacteria typically have

The cell membranes of thermophiles and hyperthermophilic bacteria typically have

The cell membranes of thermophiles and hyperthermophilic bacteria typically have
A) more saturated fatty acids.
B) more long chain fatty acids.
C) fewer unsaturated fatty acids.
D) All of these answer choices are true of thermophiles and hyperthe

JulieCarde   32   2 Replies

JulieCarde

The function of RNA polymerase is to

The function of RNA polymerase is to

The function of RNA polymerase is to
A) catalyze the formation of phosphodiester bonds between deoxyribonucleotids.
B) catalyze the formation of phosphodiester bonds between ribonucleotides.
C) cleave mRNA to remove introns.
D) activate tRNAs.

JulieCarde   22   1 Reply

cantiknya

Who was the first researcher to provide direct experimental data that supported the germ theory to ...

Who was the first researcher to provide direct experimental data that supported the germ theory to ...

Who was the first researcher to provide direct experimental data that supported the germ theory to explain infectious disease?
A) Pasteur
B) Winogradsky
C) Lister
D) Koch

JulieCarde   52   2 Replies

JulieCarde

What must a tRNA codon do when given a specific codon on mRNA?

What must a tRNA codon do when given a specific codon on mRNA?

What must a tRNA codon do when given a specific codon on mRNA?

Thank You!

Juliehansen   439   2 Replies

rk90

How are tRNA and mRNA written differently?

How are tRNA and mRNA written differently?

I'm trying to do a bio lab and it's asking for me to write something using the bases in mRNA and converting it into tRNA? I didn't know there was a difference with the letters?

Ex)
DNA - AAT - mRNA base code ____? tRNA base code_____?

Juliehansen   421   4 Replies

tommynkell

If the mRNA sequence is AAU GGG UUC GCC, what would the tRNA anticodons be?

If the mRNA sequence is AAU GGG UUC GCC, what would the tRNA anticodons be?

If the mRNA sequence is AAU   GGG  UUC   GCC, what would the tRNA anticodons be?

Juliehansen   669   4 Replies

juliasarands

What do you predict would happen to a cell in which tRNA were unable to function properly during protein synth?

What do you predict would happen to a cell in which tRNA were unable to function properly during protein synth?

synthesis?


A. It would be impossible to unwind DNA.
B. Ribosomal subunits would not be able to function.
C. The mRNA would not be translated into a sequence of amino acids.
D. Transcription of DNA into RNA would not be able to take place.

Juliehansen   3101   2 Replies

tommygirl5012

Enzyme-linked receptors?

Enzyme-linked receptors?

a) allow ions to cross the cell membrane
b) activate a second messenger in the cytoplasm
c) interact with a G-protein complex
d) generate active proteins within the cytosol to effect a functional change in the cell

Juliehansen   394   2 Replies

julibugg

How does T4 Bacteriophage have an economic impact on humans?

How does T4 Bacteriophage have an economic impact on humans?

How does it affect us? Negative? Positive?

Juliehansen   415   1 Reply

Fedorfan76

Which of the following enzymes are used by bacteria to defend themselves against bacteriophage?

Which of the following enzymes are used by bacteria to defend themselves against bacteriophage?

A)DNA polymerase
B)Reverse transcriptase
C)Phosphofructokinase
D)Restriction endonuclease
E)None of the above

Juliehansen   416   1 Reply

fireman2101

How does a bacteriophage reproduce?

How does a bacteriophage reproduce?

Helphelp

Juliehansen   568   2 Replies

julibyrd

Viruses such as a bacteriophage are capable of reproducing using the lytic and lysogenic cycles. True or Fals?

Viruses such as a bacteriophage are capable of reproducing using the lytic and lysogenic cycles. True or Fals?

Viruses such as a bacteriophage are capable of reproducing using the lytic and lysogenic cycles. True or Fals?

Juliehansen   644   3 Replies

fireman2101

Can a tRNA transfer different amino acids to the mRNA at different times during the overall process?

Can a tRNA transfer different amino acids to the mRNA at different times during the overall process?

Simple answers please!  Biology isn't exactly my best subject. lol

juliejjay   825   4 Replies

ldelovio

what enzyme is needed for tRNA nucleotides to detach from their amino acids?

what enzyme is needed for tRNA nucleotides to detach from their amino acids?

again question pretty much speaks for itself... what enzyme is needed for tRNA nucleotides to detach from their amino acids?

juliejjay   917   1 Reply

tom_van

What is the function of tRNA molecules?

What is the function of tRNA molecules?

a. transport amino acids to mRNA
b. transport amino acids to DNA in the nucleus
c. synthesize more transfer RNA molecules
d. provide a template for the synthesis of mRNA

I have looked all over for an answer to this question but can't seem to find it

juliejjay   1568   4 Replies

julie

What happens after mRNA is translated into tRNA?

What happens after mRNA is translated into tRNA?

I know the steps before that, but when it gets to here, I'm a bit confused.

juliejjay   450   2 Replies

tommygirl5012

After transcription of DNA, where does processing of the initial mRNA transcript occur in the eukaryotic cell?

After transcription of DNA, where does processing of the initial mRNA transcript occur in the eukaryotic cell?

A) Processing occurs by RNA polymerase during the initial transcription process.  
 B) After transcription, enzymes process the mRNA transcript in the nucleus, removing introns.  
 C) After transcription and the mRNA transcript has been transported t

juliejusu   788   3 Replies

julie