mRNA codons determine which amino acid will be added to the growing polypeptidic chain. tRNA anticodons pair these codons and add the correct amino acid. <em>The </em><em>dipeptide</em><em> formed will be </em><em>Cysteine-Alanine</em><em>.</em>
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Let us review a few points,
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In protein synthesis, the ribosome reads mRNA in the 5´ to 3´ direction.
- According to the codons being readen, tRNA transfers the correct amino acids to build the polypeptide chain.
- A codon is a short sequence of three nucleotides that store the genetic information for the aminoacids´ assembly.
- Each codon represents one amino acid used to build the protein.
- Each tRNA has two important sites. One of them that couples with the codon of the mRNA molecule, named anticodon. The other site couples with an amino acid.
- The anticodon is a short sequence of bases that pairs with mRNA codons.
- tRNA adds amino acids following the codons sequence in the mRNA molecule.
- The protein grows from the amino terminus to the carboxy terminus.
- Adenine forms pairs with Uracyl ⇒ A↔U
- Guanine pairs with Cytosine ⇒ C↔G
In the exposed example,
→ mRNA ⇒ codons ⇒ 5'-UGC - GCA-3'
→ tRNA ⇒ anticodons ⇒ ACG CGU
→ proteins ⇒ amino acids ⇒ Cys Ala ⇒ Codon UGC codes for Cysteine
⇒Codon GCA codes for Alanine
So, for the given sequence of mRNA, tRNA anticodons are ACG and CGU. And the added amino acids are <em>Cysteine and Alanine</em>.
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Yes A is the correct answer
Sugar, water, and other food molecules.
Cells with large numbers of mitochondria have a high energy demand
The immense amount of information stored in DNA is coded with just four base nucleotides. These four nucleotides are paired by twos to form <u>complementary </u>DNA chains.
The makeup of DNA is limited to two <u>pairs </u>of nucleotides bases. One of these pairs is a pyrimidine base whilst the other forms a purine base. The four nucleotides that will make up the entire DNA code are:
- Adenine (A)
- Guanine (G)
- Cytosine (C)
- Thymine (T).
A and G will pair to form the purine base, meanwhile, Cytosine pairs with Thymine to form the <em>pyrimidine base</em>. As per the entire DNA code, A will always pair with G.
Whilst C always pairs with T. This is due to the very nature of the nucleotides themselves and will not change throughout the synthesis or duplication of DNA. Therefore, to complete the complementary strand described in the assignment we must match the letter given with its corresponding base pair, using this rule of DNA.
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