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3. Briefly describe the function of the following in protein synthesis:
a) rRNA, b) tRNA c) mRNA
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- 9. What is the purpose of the following? a) spliceosomes b) RNA polymerase c) Protein release factors d) aminoacyl-tRNA synthetases9. Translation is the flow of information from: a) DNAàDNA b) DNAà mRNA c) mRNAà polypeptide d) polypeptideà amino acids9) Which statement is inaccurate (wrong) about mRNA? A) it is double stranded and has thymine B) it can leave the nucleus C) It is single stranded and has uracil D) It is shorter than DNA 10) Which statemment accurately describes DDNA?
- 1. . In one sentence each: a) Define a nucleic acid. b) . What is/are the major chemical difference(s) between RNA and DNA? c) How do this difference(s) differentiate RNA from DNA in terms of functions in a livingsystem?16) PROTEIN SYNTHESIS: A) Describe the process of protein synthesis. Be sure to use transcription and translation in your answer (and explain the parts involved in each process) B) Why is RNA transcription a necessary process?10. During elongation of a peptide chain, which site in the ribosome represents the location where a codon is being read? a) sigma factor b) large subunit c) A site d) E site e) P site
- 1) The nucleolus is a cytoplasmic organelle involved in the synthesis of ribosomes (true or false ) 2)DNA is often referred to as supercoiled because it is most commonly found in cells as two strands of inter-wounded DNA (true or false ) 3) translation is a process of synthesizing proteins based on base sequences of mRNA molecule (true or false )11. Transcription is the flow of information from: a) DNAàDNA b) DNAà mRNA c) mRNAà polypeptide d) polypeptideà amino acids100. Hemocytes are stem cells which become plasma cells of the White Blood Cell System. These cells produce a type of proteins called antibodies. These antibodies attack viruses and bacteria. Such cell products are: a) synthesized by the ribosomes, b) synthesized into the endoplasmic reticulum, c) transported by vesicles into the Golgi apparatus, d) released by the Golgi apparatus into the blood by exocytosis e) all of these steps occur.
- 1. TRUE OR FALSE a) Eukaryotic mRNA contains the message from the DNA for the synthesis of one polypeptide. b) The 2'OH in the sugars of RNA is advantageous to the molecule to facilitate its hydrolysis6. Nucleoside triphosphates a) are important in the building of nucleic acids b) always contain the 5-carbon sugar ribose c) can be important sources of cellular energy in metabolism d) a and c e) a, b, cBoth DNA and RNA… a)move to different parts of the cell are b)nucleic acids c)are nucleic acids and information molecules d)are information molecules e)are nucleic acids, information molecules, and move to different parts of the cell