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Homework help!

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Homework help!

Postby dtbrown » Mon Mar 02, 2009 4:08 pm

So, I'm taking a Bio course through correspondence and I'm having a hard time wrapping my head around this section.
Here is my question. Any help would be appreciated and will hopefully get the ball rolling.

Here is the mRNA strand: AUGACACGCUUACGUUAA

A) How many nucleotides are there in this strand?
B) How many codons are there in this strand?
C) Show the tRNA anticodons that will bond with the mRNA codons.
D) Show the correct sequence of amino acids coded for by this mRNA.
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Re: Homework help!

Postby sally91 » Mon Mar 02, 2009 5:04 pm

a) its easy just count the letters since each one represent one nucleotide.. and here its 18
b)i think that each three nucleotides form one codon then there s 6 codons (as i remeber)
c)im not sure about the tARN but i think it will be : TACTGTGCGAATGCAATT
d) the correct sequence should be written in a special board on ur book, no one could memorize it, search for it, or ggogle it..
PS: I TOOK THIS LESSON MANY MONTHS AGO SO IM NOT SURE OF MY ANSWERS SPECIALLY C)
HOPE IT LL HELP
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Postby dtbrown » Mon Mar 02, 2009 5:29 pm

That helped a lot thanks! Just figuring out the nucleotides and codons helped me get a good foundation and made it easier to understand and look up the amino acids.
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Re: Homework help!

Postby Harvey23 » Mon Mar 02, 2009 6:09 pm

Hey,

A)How many nucleotides are there in this strand?
18
B) How many codons are there in this strand?
6
C) Show the tRNA anticodons that will bond with the mRNA codons.
UAC UGA GCG AAU GCA AUU
D) Show the correct sequence of amino acids coded for by this mRNA
Tyrosine, Cysteine, Alanine, Aspargine, Alanine, Isoleucine

:wink:
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Postby MrMistery » Thu Mar 05, 2009 2:11 am

wrong on d) harvey..
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
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Re: Homework help!

Postby Mech » Thu Mar 19, 2009 12:25 pm

A) Singular strand of nucleotides - therefore we have a total of 18 nucleotides.
B) A codon consists of three (3) nucleotides - 18/3 = 6.
C) UAC UGA GCG AAU GCA AUU
D) I am assuming we are using (AUG ACA CGC UUA CGU UAA):
1. AUG = Methionine (start codon)
2. ACA = Threonine
3. CGC = Arginine
4. UUA = Leucine
5. CGU = Arginine
6. UAA = Stop

[Not entirely sure about the last, but the sequencing seems to work out correctly]
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