3. snRNA is produced in transcription. 4. Initiator tRNA enter ribosome with the help of EF-Tu. 5. At low oxygen partial pressure Po2, myoglobin has lower oxygen affinity than hemoglobin.
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- A binding .site for RNA polymerase is called a ___ . a. gene b. promoter c. codon d. proteinA scientist mutates elF-2 to eliminate its GTP hydrolysis capability. How would this mutated form of elF-2 alter translation? Initiation factors would not be able to bind to mRNA The large ribosomal subunit would not be able to interact with itiRNA transcripts tRNAi-Met would not scan mRNA transcripts for the start codon elF-2 would not be able to interact with the small ribosomal subunit.1. Discuss how cholesterol is transported between tissues in plasma lipoproteins. 2. When a gene is being transcribed, the nitrogenous base code must be made available for reading by polymerizing enzymes. Discuss where it begins?
- In bacteria sigma factors: 1. Transcript factors2. Specialized subunit of the core enzyme 3. Signal termination 4. Guide RNA polymerase to different kinds of promoters1. The SRP is recognized by the SRP receptor. 2. The ribosome translates the protein through the translocon and into the ER lumen. 3. The ribosome attaches to the translocon. 4. Chaperones assist in the proper folding of the protein. 5. The signal peptide on the nascent polypeptide is synthesized by the ribosome and recognized by the SRP (signal recognition protein). A. 5, 3, 1, 2, 4 OB. 1, 5, 4, 3, 2 C. 5, 1, 3, 2, 4 OD. 1, 2, 3, 4, 5 E. 1, 5, 3, 2, 4 QUESTION 32 The side of the Golgi stack orientated towards the endoplasmic reticulum is the OA. cis-Golgi network B. trans-Golgi network OC. vesicle OD. medial-Golgi QUESTION 33 Which molecule is displaced when a vesicle and its target membrane fuse? A. Water OB. Cholesterol OC. Phospholipids D. DNA OE. SNARES 2. 2.1. Which of the following introns are usually removed from hnRNA only by spliceosomes? non-transcribed spacers Type II introns viroids Type I introns hammerhead ribozymes
- 4. Peptidyl transferase activity... True False i. catalyzes peptide bond formation. ii. is an enzymatic function of proteins found in the large ribosomal subunit. iii. joins amino acids on tRNAs in the P and E site of the ribosome. iv. requires GTP hydrolysis by the elongation factor.Capacity to carry oxygen by sickle cell hemoglobin is reduced due to A premature termination of a- globin chain translation b splice junction mutation c formation of a rope-like polymer of deoxyhemoglobin d Micro RNA expression in hematopoietic celles E replacement of O2 in heme by cyanide ionResearchers have identified a mutation in the LMNA gene, which encodes some of the pro- teins in the nuclear envelope to be associated with the development of muscular dystrophy and other auto-immune diseases. Which of the following best describes a likely direct effect of a mutation of the LMNA gene? A It directly alters the production of ATP within the affected cells. B с D It directly alters the intake of nutrients in the affected cells. It directly alters the folding of proteins into their functional shape. It directly alters the synthesis of proteins from nucleic acid sequences within the af- fected cells.
- 1. Which of the introns listed below are usually removed from hnRNA only by spliceosomes? non-transcribed spacers Type II introns viroids Type I introns hammerhead ribozymes5. Which of the following descriptions of EF-Tu is correct? A. EF-Tu delivers fMet-tRNA to the A site of the ribosome. B. EF-Tu delivers fMet-tRNA to the P site of the ribosome. C. EF-Tu facilitates the translocation of tRNA and mRNA down the ribosome in elongation. D. EF-Tu hydrolyses GTP to GDP. E. EF-Tu participates in translation termination.Which of the following statements about ribosomes is correct? * a. the number of ribosomes in a cell seldom exceeds 50 b. the active site of a ribosome contains mostly protein molecules c. structurally, ribosomes have two rRNA- protein subinuts d. no correct response What is the complementary hnRNA base sequence produced from the DNA base sequence 5' C-T-A-T-A-C 3' ? * a. 3' C-T-A-G-A-T 5' b. 3' C-G-G-A-T-A 5' c. 3' G-A-U-A-U-G 5' d. 3' G-A-T-A-T-G 5' The product of the first phase in protein synthesis is * a. DNA molecules b. RNA molecules c. both RNA and DNA molecules d. neither RNA and DNA molecules