Codon's

[osimsDDS]

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How many codon's code for Amino Acids?
a) 64
b) 62
c) 70
d) 60
e) 61

Answers and explanations to answers...

 

[bumpski20]

id say 61. there are 64 possible combinations (4*4*4) but the 3 stop codons (UAG UAA UGA) don't code for amino acids so subtract 3

 

[osimsDDS]

very nice it was a trick question but you got it, originally 64 but stop codons are not aa so subtract 3 = 61 that actually code for aa's.

Now another question (I am testing):

What functional group is attached to the 5' end of an mRNA in RNA processing before it leaves the nucleus for translation?
a) ATP
b) ADP
c) GDP
d) GTP
e) CTP

 

[Glycogen]

I second that and check this out:

http://algoart.com/aatable.htm

 

[osimsDDS]

Also can ask this question while im at it:

How many purines are added to the poly A tail of mRNA during RNA processing and what is the main purpose?
a) 1000 Adenines, for energy
b) 500 Thymines, for stability in the cytoplasm
c) 300 Guanines, for stability in the cytoplasm
d) 200 Adenines, for stability in the cytoplasm
e) 500 Cytosines, for energy

 

[Glycogen]

Ctp?

 

[Glycogen]

Also can ask this question while im at it:

How many purines are added to the poly A tail of mRNA during RNA processing and what is the main purpose?
a) 1000 Adenines, for energy
b) 500 Thymines, for stability in the cytoplasm
c) 300 Guanines, for stability in the cytoplasm
d) 200 Adenines, for stability in the cytoplasm
e) 500 Cytosines, for energy

I think the answer in d!
It should be Adenine.

 

[osimsDDS]

very nice it was a trick question but you got it, originally 64 but stop codons are not aa so subtract 3 = 61 that actually code for aa's.

Now another question (I am testing):

What functional group is attached to the 5' end of an mRNA in RNA processing before it leaves the nucleus for translation?
a) ATP
b) ADP
c) GDP
d) GTP
e) CTP

Answer to this one is D, Guanine with phosphate groups are attached to the 5' end of the mRNA this is also known as the 5' cap before the mRNA is released into the cytoplasm for translation...the GTP has a high bond energy which the ribosomal subunits attach to...

 

[bumpski20]

sweet I was gonna guess one of the G's for the second question. and i agree with glycogen on D for the third question

 

[osimsDDS]

yea the 3rd question is right...its adenine poly A tail and it is a purine indeed...but I was trying to trick ppl with the numbers haha...the actual number is 200 so yea good job guys!!!

 

[bumpski20]

heres a question...

an mRNA sequence contains 75 exons. how many introns?

A) 73
B) 74
C) 75
D) 76

 

[bumpski20]

Which RNA polymerase is responsible for the transcription of mRNA and snRNA (u1 u2 u4 u5)?

A) RNA pol I
B) RNA pol II
C) RNA pol III
D) RNA pol IV
E) RNA pol gama

 

[osimsDDS]

I would guess 76...d for the first one

Second question is RNA pol II

RNA Pol I transcribes DNA to make rRNA
RNA pol II transcribes DNA to make both mRNA and snRNA
RNA pol III transcribes DNA to make tRNA and rRNA

RNA pol IV and gama...no such thing as far as I know haha

 

[bumpski20]

the first one is 74. if the introns are between the exons, there has to be 1 less intron.

great job with the second! everything you said was right! no such thing as rna pol IV or rna pol gama. there is, however a DNA pol gamma, which is responsible for the replication of mitochondrial and chloroplast DNA.

 

[osimsDDS]

hmm did not know that about dna pol gama...love this website you learn something everyday...

 

[osimsDDS]

What is the term used when the plasmid is incorporated into the bacterial chromosome?
a) F plasmid
b) R plasmid
c) incorporated plasmid
d) episome
e) Hfc Plasmid

 

[bumpski20]

haha i know i literally take notes off this website! the answer is D, episome.

 

[osimsDDS]

nice episome is the answer the others were related to conjugation...

Hit me with one lets keep this thing rolling...

 

[bumpski20]

haha alright...

which of the following is done to protect bacterial RNA from enzymes:

A) 5' cap
B) splicing
C) 3' poly A tail
D) coupling of transcription and translation
E) A and C

 

[osimsDDS]

D i believe is the answer but it might be e haha, b is wrong cuz splicing doesnt occur in bacteria...

What occurs during RNA interference when short interfering RNA's (siRNA's) black mRNA transcription or translation?
a) enzymes degrade mRNA
b) siRNA's cut the single stranded mRNA molecule
c) siRNA's cut the double stranded mRNA molecule
d) no such thing as siRNA's

 

[bumpski20]

yes, D is right. there is little to no processing in bacterial RNA. since one of the primary purposes of processing is to protect the RNA from degrative enzymes, transcription and translation are coupled for protection purposes.

iv never heard of siRNA...and you seem to like tricks so im gonna go with D no such thing.

 

[osimsDDS]

HAHAHAH nope didnt trick you this time haha thats funny tho...

ok so siRNA's is a form of gene regulation in eukaryotes...RNA folds on itself and causes it to become double stranded, then the siRNA come in and snip it at particular sites and then those sites attach or stick to DNA complimentary so that part of the DNA that codes for the particular gene for a protein will not undergo transcription to produce the certain protein anymore...its pretty interesting I found it in cliffs AP bio

 

[bumpski20]

haha thats funny! thanks for the explaination, i just made another flashcard to add to the giant pile! ok one more question and then i have to get back to studying:

which of these is a family of proteins that directly assists other proteins with self folding?

A) chaperonins
B) molecular chaperones
C) hammer head ribozymes
D) folder proteins

 

[osimsDDS]

b, molecular chaperones??? tough question cuz A could also be true but ur asking for family of proteins so I would choose b???

 

[gkhan]

is it:
A) chaperonins

*edit haha
"ur asking for family of proteins so I would choose b???"

thats the exact reason why I picked A instead of B. lol

 

[bumpski20]

i thought chaperonins were also considered a family of proteins, which is why id say the answer is A. chaperonins directly facilitate in the folding of proteins, but molecular chaperones prevent proteins from folding when they are not supposed to. if chaperonins arent considered a family of proteins then my questions not so good hahaha.

 

[osimsDDS]

yea my bad you guys are right...

chaperonins: help newly synthesized proteins convey their folding
molecular chaperones: they do not help proteins convey their folding but they help proteins such as histones in nucleosome structure of DNA fold the DNA...if that made sense.