F08-homework_4 - Which codon usage is preferred in...

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Homework 4 BCH 361 Fall 2008 Name of the student: (1) Draw the structures of a Adenosine-5'-triphosphate (ATP) and Deoxycytidine-5'- monophosphate (dCMP) (2) Name the three different forms of DNA (secondary structure). Which of the form is most common in nature? (3) Draw the structure of thymine and uracil and give a suggestion why uracil has been replaced by thymine in the DNA. (4) What is the difference between type I and type II topoisomerases. (5) Name the five different types of RNAs and indicate their function in the cell 1
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(6) In which direction grows the emerging m-RNA chain and in which direction does the RNA- polymerase move along the DNA template strand? (7) Draw the secondary structure of the t-RNA and indicate the anticodon loop. To which end (3' or 5') is the amino acid attached? (8) What is a gene? (9) How many bases code for one amino acid. What is meant by the term “wobble position”?
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Unformatted text preview: Which codon usage is preferred in thermophilic organisms? (10) What is the function of the TATA box? (11) Describe the 4 steps of the transcription of DNA into m-RNA in prokaryotes. 2 (12) How many elements are forming the promoter region of eukaryotic transcription initiation sites? Name the elements and describe their function! (13) Name one inhibitor for the eukaryotic RNA Polymerase II ! (14) Which RNAs are synthesized by the eukaryotic RNA Polymerases I, II and III? (15) In which step of the eukaryotic RNA synthesis does the phosphorylation occur? In which step of the functioning of the RNA Polymerase II does the dephosphorylation occur? (16) Which protein factor recognizes the TATA Box in Eukaryotes? (17) Describe the steps, which are involved in maturation of the pre-RNA to the m-RNA in Eukaryotes. (18) What is a splicosome? 3...
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