CELL BIO BIOL 3113 EXAMS QUESTIONS AND ANSWERS

Living systems are incredibly diverse in size, shape, environment, and behavior. It is estimated that there are between 10 million and 100 million different species. Despite this wide variety of organisms, it remains difficult to define what it means to say something is alive. Which of the following can be described as the smallest living unit? a) organelle b) DNA c) Cell d) protein - Answer-c The central dogma provides a framework for thinking about how genetic information is copied and used to produce structural and catalytic components of the cell. From the choices below, select the order of biochemical processes that best describes the central dogma. a) RNA -- translation -- DNA -- transcription -- protein b) DNA -- transcription -- RNA -- translation -- protein c) DNA -- translation -- RNA -- transcription -- protein d) RNA -- transcription -- DNA -- translation -- protein - Answer-b Which statement about cells is FALSE? Light microscopy can show the commonalities between plant and animal tissues. a) Cells all have the same basic chemistry. b) Cells are highly organized. c) New cells can form spontaneously from the remnants of ruptured cells. d) New cells arise from the growth and division of previously existing cells. - Answer-c Cell biologists employ targeted fluorescent dyes or modified fluorescent proteins in both standard fluorescence microscopy and confocal microscopy to observe specific details in the cell. One protein we talked about is called Green Fluorescent Protein (GFP). Which of the following statements about GFP is true? a) Since it is usually found in jellyfish, it is difficult to use other organisms because the genetic code isn't used in the same way in every known organism. b) It changes the resolving power of the microscope. c) It can be used to localize a protein within a cell, thus giving clues into that protein's function. d) Since GFP is originally from jellyfish, its expression in other organisms typically kills the cells. - Answer-c Consider Abbe's equation (below). d=0.5λ/ηsinθ To have better resolution, what would need to happen to 'd'? a) d would increase b) d w