Using the genetic code below, what protein sequence does the rna sequence cuagcucgauaucuc code for?

Using the genetic code below, what protein sequence does the rna sequence cuagcucgauaucuc code for?

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  1. If CUAGCUCGAUAUCUC is a mRNA sequence then the codes are:  
     CUA - Leucine
     GCU - Alanine
     CGA - Arginine
      UAU - Tyrosine
     CUC – Leucine
    This means that the protein synthesized during the translation is going to have a sequence LeuAlaArgTyrLeu.

  2. Answer:

    1. Gene expression may be controlled by epigenetic mechanisms.

    The base pair sequence of a gene is not solely responsible for the sequence of amino acids. A gene may have several allele/variants whose expression is controlled by multiple factors. Epigenetic processes such as DNA methylation, do not involve changes in the DNA sequence. Instead they influence the protein amino acid sequence by changes in the process of transcription or even translation.

    2. The mutation introduced a stop codon into the middle of the mRNA molecule.

    The protein will be shorter if the point mutation causes the creation of a stop codon in the interior of the mRNA strand. Thus, the remaining sequence after the mutation will no longer be used to create the rest of the protein.

    3. Pre-mRNA is not edited, and is used as mRNA.

    Because no introns and exons are included in the model, the pre-mRNA is not edited. During this step, the introns are removed from the DNA strand. However, due to the fact that the model does not define them and thus differentiate between them and the exons, the pre-mRNA will be used as mRNA.

    4. The process of translation in the beetle is similar to other organisms, but involves a unique genetic code.

    The processes of translation and transcription are identical in all organisms. The only difference is the DNA sequence itself, which is species or organism specific. Thus, as it is a new beetle species, its genetic code will be unique. However, it will be translated and transcripted in the same manner as that in all other species.Their mRNA will also have and use the same nucleic acids.

    5. The removes introns from pre-mRNA.

    The pre-mRNA includes both introns and exons. However, only exons are used in the protein synthesis, whereas the introns are removed during the pre-mRNA stage.

    6. Each of many tRNA molecules contains an anticodon, and it binds to a specific amino acid.

    The anticodon of a tRNA molecule is amino acid specific. Thus, it can bind to one or a few specific mRNA codons.

    7. RNA contains uracil (U) instead of thymine (T).

    Both DNA and RNA have phosphate groups bound to a nitrogenous base. However, the single stranded RNA has uracil instead of the thymine found in the double stranded DNA. Also, both RNA and DNA have cytosine and guanine.

  3. A codon

    Explanation: A codon is a sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis. DNA and RNA molecules are written in a language of four nucleotides; meanwhile, the language of proteins includes 20 amino acids.

  4. 1. A. DNA caries genetic code which are transcribed and translated to produce proteins specific to the code.
    2. B. DNA is created from nucleotides which are nitrogen bases.
    3. D. Building blocks of protein are amino acids.

    I encourage you to review your notes and ensure you understand why the answers are what they are.

  5. complementary base-pairing rules


    DNA is the genetic material of living cells. It is a long chain of double-stranded molecules, in which each strand is complementary to one another i.e. Adenine base is paired with Thymine base while Guanine base pairs with Cytosine base following the complementary base pairing rule as proposed by Chargaff. This pairing is responsible for the double helical structure of the DNA.

    The complementary base pairs that a DNA molecule contains make it able to produce identical copies of itself during replication or duplication. Before replication of DNA can occur, the double strands need to unwind to form two separate strands, which serves as a template for the synthesis of new complementary strands.

    In this manner, each new strand contains one template strand and one complementary strand, which forms two new double helix that is identical to the original strand. This two identical copies of DNA gets separated into two daughter cells, which is the essence of the DNA replication.

  6. D. All species share a common ancestor.


    The genetic code is the same for all organisms and is passed on from generation to generation. So, the genetic code provides evidence that all species share a common ancestor.

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