Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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A DNA strand consists of any sequence of four kinds of
a) 1
b)2, provided that chain termination does not require a special codon
c) 3, provided that chain termination does require a special codon
d)2, no matter how chain termination is accomplished
e) Both b and c
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- You’re working in Marshall Nirenberg’s lab, trying to decipher the genetic code. You use several different synthetic repeating mRNAs in translation reactions and analyze the sequences of the polypeptides produced from each reaction. The results are summarized below. mRNA sequence used: ...CACACACACACACAC... Polypeptide produced: ...His-Thr-His-Thr-His-Thr ...mRNA sequence used: ...CCACCACCACCACCA...Polypeptide produced: ...Thr-Thr-Thr... and ...Pro-Pro-Pro... and ...His-His-His...mRNA sequence used: ...ACAACAACAACAACA...Polypeptide produced: ...Thr-Thr-Thr... and ...Asn-Asn-Asn... and ...Gln-Gln-Gln... Based on these results, write what amino acid each codon below corresponds to. If there is not enough information to narrow down to one amino acid, write all the possibilities.CAC: ___________________________ ACC: ___________________________ ACA: ___________________________ CAA: ___________________________ CCA: ___________________________ AAC: ___________________________arrow_forwardWhich of the following recognizes the mRNA codon 5' - U A A - 3'?Question 29 options: A) a special termination tRNA B) a special termination amino acid C) a special termination protein D) Kozak's sequence E) aminoacyl tRNA synthetasearrow_forwardTo visualize the spatial arrangement of amino acid residues in an a-helix, it is helpful to imagine you are looking down the long axis of the helix, just as you would look down a soda straw. Viewed in this orientation, the residues form a circle, with each residue offset from its neighbor by 100 degrees. This representation is called a helical wheel. Use the circle below to indicate the position of each residue around the helix of the enzyme lysozyme. NH ...Arg - Cys - Glu- Leu - Ala Ala - Ala Met-Lys COO- The first two amino acids, Arg-1 and Cys-2, are shown as an example. Arg-1 O Glu-3 Which amino acid in the polypeptide is the first to pass the origin (i.e., which amino acid passes Arg- 1 first, completing one full circle)? Select the best answer. O Leu-4 O Ala-5 O Ala-6 O Ala-7 Met-8 O Lys-9 100° O none of the above Cys-2arrow_forward
- Codons 24 to 66 represent an intron. At what point in the process of protein synthesis are introns removed? What is the name of the enzyme responsible for removing them?arrow_forwardIdentify whether each of the following descriptions applies to typical prokaryotic genomes only, typical eukaryotic genomes only, both, or neither, according to lecture. Answer options may be used more than once or not at all. Composed of double-stranded DNA only. Each chromosome has a centromere. Species with larger genomes have more genes. [Choose ] [Choose ] prokaryotes only neither eukaryotes or prokaryotes eukaryotes only both prokaryotes and eukaryotes [Choose ]arrow_forwardThe following diagram of protein synthesis will be used for the next four questions. We will call this stretch of nucleic acid, Gene #1. Notice the letters located at various locations in the diagram. Those letters will be referenced in the following questions. D What is the structure labeled E in the protein synthesis diagram and what does it specify? Answer. What is the name of the process that occurs at letter X in the diagram? What would be the sequence of amino acids (and only amino acids) that would be produced from gene #1? Answer What effect would the deletion of structure C have on the process that accuns during step Y? Answerarrow_forward
- Explain how a peptide bond is formed in translation elongation in terms of: a) Which enzyme catalyzes it b) Where is occurs at the ribosome (EPA sites?) c) What kind of a chemical reaction it is.arrow_forward#17 #18 please I will give you ?arrow_forwardThe characteristic way in which the DNA molecule is copied to form mRNA is most related to: a) the ability of RNA polymerase to match the shape of and the charges of the DNA monomers to the complementary mRNA nucleotide monomers, b) the ability of RNA polymerase to match the shape of and the charges of the DNA monomers to the anti-codons of tRNA, c) The interaction with the cell membrane, d) All of these e) None of these are correctarrow_forward
- Compare the process of Replication, Transcription, and Translation by describing the following properties for each: (circle, highlight, bold or whatever mechanism you want to use to indicate your answer)arrow_forward1. A) Explain this statement, “Most enzymes are gene-encoded proteins, but most enzymes are not only protein". B) You recently isolated a new enzyme in your lab, and you named it "lipidase 1120". As a temporary name, this is fine. Who is responsible for assigning a formal name, and on what criteria will that name be assigned?arrow_forwardThe process shown here is a) Splicing b) Replication c) Transcription d) Translation Laten The process shown here is a) Replication b) Splicing c) Translation Adenine (A) Thymine (T) Cytosine (C) Guanine (G) Uracil (U) d) Transcription or ↓arrow_forward
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