Homework help!

March 2, 2009 at 4:08 pm #10987

Participant

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.

March 2, 2009 at 5:04 pm #89431

sally91

Participant

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

March 2, 2009 at 5:29 pm #89432

dtbrown

Participant

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.

March 2, 2009 at 6:09 pm #89433

Harvey23

Participant

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

😉

March 5, 2009 at 2:11 am #89480

MrMistery

Participant

wrong on d) harvey..

March 19, 2009 at 12:25 pm #89773

Mech

Participant

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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