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- (4) Which of the following processes does ciprofloxacin interfere with in order to prevent bacterial growth?(A) Cell wall synthesis (B) DNA repolicsation (C) Electron trsansport (D) Protein Synthesis (E) RNA chain elongation1.how does II mM hydroxyurea inhibit DNA synthesis4 What Kinds of Covalent Modification Regulate the Activity ofEnzymes?
- 1. Why is it important to lower the temperature of the chicken liver at the initial stages of glycogen isolation?1. Which of the following rules apply to the synthesis of nucleic acids? A. Nucleotides are added to the 5' end of nucleic acids. B. Complementary pairing between bases is required for copying nucleic acids. C. The synthesis of nucleic acids cannot occur without the presence of an enzyme to catalyze the reaction. D. Strands are synthesized in a parallel direction such that one end of the double-stranded product has the 3' ends and other has the 5' ends. 2. Why does it take three turns of the Calvin cycle to produce G3P, the initial product of photosynthesis? A. To produce RuBisCo as an end product. B. To fix enough oxygen to export one G3P molecule. C. To fix enough carbon to export one G3P molecule. D. To produce ATP and NADPH for fixation of G3P. 3. For protein synthesis, an amino acid needs to be attached by its _ group to the _ of the tRNA molecule. A. A. Amino; phosphoryl group on the 5'-end. B. Carboxyl; hydroxyl group on the 3'-end. C. Carboxyl; hydroxyl group on the 5'-end. D.…1. Why does a cell use deoxyribonuclease?
- 1. Which of the following pathways of information flow has never been observed on Earth? chose all that apply a. From RNA to DNA b. From RNA to Protein c. From DNA to RNA d. From Protein to RNA e. From Protein to DNA f. From DNA to Protein 2. Which biosynthetic pathways are downregulated by the products of the de novo purine biosynthesis pathway? Choose all that apply a. The de novo pyrimidine biosynthesis pathway b. The pyrimidine salvage pathway c. The pathway to 5-phosphoribose-1-pyrophosphate (PRPP) d. The de novo purine biosynthesis pathway e. The pathway to the amino acid histidine f. The purine salvage pathway1. What are two major similarities between protein synthesis in bacteria and eukaryotes? What aretwo major differences? 2. Is it reasonable to expect that protein degradation can take place at any location in a cell? 3. . In ubiquitination, chaperone can be part of the process. Explain the benefits of using chaperoneand differentiate the uses of chaperone and ubiquitin.2. The rising of nanotechnology paved way to discover new trends, one of which is the discovery of newly synthesized amino acid. Which of the following is a newly synthesized amino acid which was translated from the sequence of UAG? * A. Pyrrolysine B. Selenocysteine C. Threonine D. Proteoglycan
- 3. Explain how water activity and pH can affect the susceptibility of proteins to denaturation by heat.1) What is the purpose of hydrolyzing the RNA before conducting biochemical tests?2) We often think only of DNA and RNA as nucleic acids. Discuss the role of other, less “well-known” nucleic acids, such as cAMP, cGMP, NADH, NADPH, and FADH.
