7/25/2023 0 Comments Terminator sequence definition![]() Plasmids can be transferred independently of the bacterial chromosome during cell division and often carry traits such as antibiotic resistance. In addition, prokaryotes often have abundant plasmids, which are shorter circular DNA molecules that may only contain one or a few genes. ![]() The central region of the cell in which prokaryotic DNA resides is called the nucleoid. A bacterial chromosome is a covalentlyĬlosed circle that, unlike eukaryotic chromosomes, is not organized around histone proteins. The prokaryotes, which include bacteria and archaea, are mostly single-celled organisms that, by definition, lack membrane-bound nuclei and other organelles. These questions address the following standards: The Science Practices Assessment Ancillary contains additional test questions for this section that will help you prepare for the AP exam. Heritable information provides for continuity of life.ģ.A.1 DNA, and in some cases RNA, is the primary source of heritable information.Ħ.5 The student is able to evaluate alternative scientific explanations.ģ.1 The student is able to construct scientific explanations that use the structures and mechanisms of DNA and RNA to support the claim that DNA and, in some cases RNA, is the primary source of heritable information. Living systems store, retrieve, transmit, and respond to information essential to life processes. ![]() A Learning Objective merges required content with one or more of the seven Science Practices. The Learning Objectives listed in the Curriculum Framework provide a transparent foundation for the AP ® Biology course, an inquiry-based laboratory experience, instructional activities, and AP ® Exam questions. Information presented and the examples highlighted in the section support concepts outlined in Big Idea 3 of the AP ® Biology Curriculum Framework. Termination frees the mRNA and often occurs by the formation of an mRNA hairpin. Transcription continues until RNA polymerase reaches a stop or terminator sequence at the end of the gene. In prokaryotes, mRNA synthesis is initiated at a promoter sequence on the DNA template. During transcription, the enzyme RNA polymerase moves along the DNA template, reading nucleotides in a 3′-to-5′ direction-U pairing with A and C with G-and assembling the mRNA transcript in a 5′-to-3′ direction.
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