pickbrainwk1answer

pickbrainwk1answer - Jennifer Phun Section pm Center 205 OH...

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Jennifer Phun Section: Wednesday 2-3, 3-4pm Center 205 OH: Wednesday 4-5pm Perks 1. Which of the following correctly describes the coding relationships (template -> product) for  replication, transcription and translation? a. DNA -> DNA During replication, parental DNA serves as a template for synthesis of RNA b. DNA -> Rna During transcription, DNA serves as a template for synthesis of RNA c. DNA -> protein d. RNA -> DNA e. RNA -> RNA f. RNA -> protein During translation, RNA (mRNA) serves as the template for synthesis of  protein.  g. Protein -> DNA h. Protein -> RNA i. Protein -> protein Two other process, D, RNA-> DNA is called reverse transcription, and E. RNA->RNA is  RNA replication, occur in the life cycles of RNA viruses. 2. Several prokaryotic genomes have been completely sequenced and their genes are counted  (model organism sound familiar? :0) But how do you supposed one recognizes a gene in a  string of Ts, As, Cs and Gs? Genes that encode protein, which are the vast majority, start with ATG/AUG and end with TAA,  TAG, or TGA/ UAA, UAG, and UGA stop codons. This defines an open reading frame. Gene  identification in eukaryotic genome sequences is much more problematic since the protein- coding regions of eukaryotic genes are often split into segments that are not finally united until  the initial RNA transcript is processed to remove noncoding RNA. Thus, the procedure to count  genes in prokaryotes is not useful for eukaryotes and we rely on computer algorithms, which is  still not that reliable. ;( 3. True or False, Most interactions between macromolecules could be mediated just as well by  covalent bonds as by noncovalent bonds. If false, why? (Just a hint, it’s obviously false, so  why?) False. Many of the functions that macromolecules perform rely on their ability to associate and  dissociate readily, which would not be possible if they were linked by covalent bonds. By linking  their macromolecules noncovalently, cells can, for example, quickly remodel their interior when  they move or divide, and easily transport components from one organelle to another. It should be noted that  some macromolecules are linked by covalent bonds. This occurs primarily in situations where  extreme structural stability is required, such as in the cell walls of many bacteria, fungi, and  plants, and in the extracellular matrix that provides the structural support for most animal cells.
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Jennifer Phun Section: Wednesday 2-3, 3-4pm Center 205 OH: Wednesday 4-5pm Perks 4. C, H, and O account for 95% of the elements in living organisms. These atoms are present in 
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