BIOS 242 Week 3 Quiz MCQs Short Answer Latest Complete Solution Guide Questions and Answers 100 Pass
Week 3 Quiz MCQs and Short Answer Study Guide BIOS 242 | Certified A+ Answers What is an organism that grows in lower pH conditions called - answer - Acidophile Which term describes a microorganism that obtains nutrients by decomposing dead organic matter in its environment - answer - Saprobe Organisms that use inorganic carbon sources (such as carbon dioxide) are know as - answer - Autotrophs Organisms that use organic carbon sources (such as glucose) are known as - answer - Heterotrophs Heterotrophs obtain carbon from organic molecules like - answer - glucose Autotrophs obtains carbon from - answer - inorganic carbon dioxide Phototrophs obtain energy from - answer - Light Chemotrophs obtain energy from - answer - Chemical compounds Acquire energy from light and carbon from carbon dioxide - answer - Photoautotrophs Obtain energy from inorganic or organic compounds and carbon from carbon dioxide - answer - Chemoautotrophs Acquire energy from light and carbon from organic compounds - answer - Photoheterotrophs Use organic compounds for both energy and carbon sources - answer - Chemoheterotrophs Obtain energy from dead organic material - answer - Saprobes Obtain energy from living organisms - answer - Parasites Does not use energy - answer - Passive transport The movement of molecules in a gradient from an area of higher density or concentration to an area of lower density or concentration - answer - Diffusion The movement of water across a selectively permeable membrane - answer - Osmosis The movement of a specific substance with the assistance of a carrier protein - answer - Facilitated diffusion Move nutrients against the diffusion gradient or in the same direction as the natural gradeint but at a faster rate with energy expenditure - answer - Active transport Solute concentration in the external environment is equal to the cells internal environment. Diffusion of water proceeds at the same rate in both directions - answer - Isotonic Solute concentraion of the external environment is lower than that of cells internal evironment - answer - Hypotonic The environment outside the cell has a slightly hgiher concentration of solutes than inside the cell - answer - Hypertonic BReak apart - answer - Lyse Microogranisms living in habitats with high solute concentrations are called - answer - Osmophiles Water pressure exerted on organisms - answer - Hydrostatic pressure In what environment would a halophile live - answer - Hypertonic Range of temperatures for the growht of a given microbial species - answer - Cardinal temperature What is the term for microorganisms that can withstand brief exposure to elevated temperatures - answer - Thermoduric Which growth phase requires cells to go through a period of adjustment, enlargement, and synthesis - answer - Lag phase What type of microorganism obtains energy and carbon by breaking down organic molecules - answer - Chemoheterotroph During which phase of microbial growth do microorganisms experience rapid and continuous cell division, doubling the population with each generation - answer - Exponential growth phase In a thioglycolate tube, where would you expect to find microorganisms that only grow in the absense of oxygen, such as Chostridium species - answer - At the bottom of the tube, where oxygen is completely depleted What is the main difference between a saprobe and a parasite - answer - A saprobe derives nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals Microbial life in deep-sea hydrothermal vents relies on unique nutritional strategies. Which type of microorganism can synthesize organic compounds from carbon dioxide using the energy derived from chemical reactions - answer - Chemoautotroph What therm for microbial growth represents the time it takes for a population of microoganisms to double in number under optimal growth condi
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