certain biological conditions these are adaptive and are called inducible enzymes. These enzymes in gene regulation can exhibit either positive or negative control. Positive control allows transcription to occur only when a regulatory enzyme stimulates RNA production. Negative control means genes will be transcribed until a regulatory enzymes blocks or interferes with transcription. One example of gene regulation of prokaryotes is the lac operon gene. Cells have a mechanism to ensure that only certain
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consist of a single nucleic acid molecule which can be either DNA or RNA. There is comparatively little genetic material for example E.coli genome is 1200 micrometres while a single human chromosome is between 12000 and 73000 micrometers in size. Unlike in eukaryotes the genetic material in viral prokaryotes can be single or double stranded RNA or DNA. It can also be linear or circular. Only in viruses can the genetic material be RNA. For example in HIV the virus can infect a host cell and use an enzyme
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the protein synthesis site in the cytoplasm. A) Transfer RNA Answer: B B) Ribosomal RNA Diff: 1 Page Ref: 105 C) Synthetase enzymes 16) Act as "interpreter" molecules that recognize specific amino acids and nucleotide base sequences. D) ATP Answer: A E) Messenger RNA Diff: 1 Page Ref: 105 17) Attaches the correct amino acid to its transfer RNA. Answer: C Diff: 1 Page
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Case 09-1: Velocity Cellular Page 1 D I S C U SS I O N M A T E R I A L S O b j e c t i v es o f t h e C a se This case gives students the opportunity to use accounting and auditing literature and professional judgment to research complex accounting issues effectively and efficiently. Specifically‚ students will be able to: Understand the application of the guidance in ASC 605-25‚ as amended by ASU 2009-13‚ to complex multiple-deliverable arrangements. Understand the application of the
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The nucleus main function is to contain instructions for growth‚ work and maintenance of the cell‚ it controls nearly all the activities of the cell. "A smaller‚ darker sphere is often visible‚ the nucleolus‚ this is a source of ribonucleic acid (RNA) one of the nucleic acids" [2]. When a cell is not dividing (known as resting) this is called the chromatin network and the nuclear material appears like a thick‚ triangle mass. When a cell is in the process of dividing‚ the chromatin network separates
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triangle-shaped diagram shows that three systems can interact to silence genes in cells. Arranged as points on the triangle‚ the systems are DNA methylation‚ histone modification‚ and RNA. From each of the systems‚ arrows point to the interior of the triangle‚ indicating that these systems may produce heritable silencing‚ though RNA-associated silencing in higher organisms has not yet been established. View Full-Size ImageFigure 1 Epigenetics involves genetic control by factors other than an individual’s
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Week 3 Activity Chapter 15: Choose the best answers in the following cases: 1. Which of the following is not a characteristic of living things? a. Living thing use energy b. Living things maintain themselves c. Living things have the capacity to reproduce d. Living things are part of populations that remain constant from one generation to the next 2. The macromolecules made from carefully folded strings of amino acids are a. Proteins b. Carbohydrates c. Lipids d. Nucleic acid 3. One
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were fast green which is used to stain proteins. Periodic acid-Schiff stain (PAS)‚ which is used to stain carbohydrates. Feuglen stain which is used to stain DNA. Sudan Dye III which is used to detect lipids and Azure B which is used to stain DNA and RNA from blue to purple. In this lab‚ we were able to observe several different tissues and the major structures of each cell‚ while also indicating the colors we saw in each. Using histology the study of the structure
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SIMILARITIES building blocks carbon compounds amino acids‚ nucleotides‚ fatty acids‚ monosaccharides Functioning units proteins‚ nucleic acids‚ lipids‚ carbohydrates information storage info expression DNA‚ use the same language‚ genes RNA‚ information transfer‚ same language Protein prduction Proteins are made the same way - by the ribosome metabolism use many of the same biochemical pathways Cellular boundary plasma membrane Cell wall ridgidity‚ cellular protection peptidoglycan;
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Cristina Alzandua General Biology 1401 Dr. Erin Schuenzel February 13‚ 2014 Bacterial and Eukaryotic Cell Structures All organisms are composed of cells which are characteristically microscope in size. Cell size is limited by the efficiency of diffusion across the plasma membrane. A typical eukaryotic cell is 10 to 100 micrometers in diameter opposed to prokaryotic cells are 1 to 10 micrometers in diameter. Bacterial and Eukaryotic cells display different cell organization in their size and
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