The nitrogen cycle is important biologically because:?QUESTION 7photosynthesis by plants and phytoplankton removes substantial amounts of atmospheric nitrogen.nitrogen forms the framework for organic molecules essential to all organisms.nitrogen is a component of amino acids, proteins, and nucleic acids.nitrogen is a major constituent of phospholipids, ATP, and other energy-storing molecuWhich of the following nutrient cycles has the smallest atmospheric component?the carbon cyclethe phosphorus cyclethe nitrogen cyclethewater cycleQUESTION 8The largest reservoir of phosphorus in most ecosystems is:dissolved in water.in rocks and sediments.bound in below-ground plant tissues.in mycorrhizaeQUESTION 9In what way(s) does the phosphorus cycle significantly differ from the nitrogen cycle?Unlike nitrogen, phosphorus is scarce enough to limit plant growth.Unlike nitrogen, the phosphorus cycle lacks a significant atmospheric component.Unlike nitrogen, quantities of phosphorus are moved through the cycle by humans through the use of fertilizers.Unlike nitrogen, the phosphorus cycle has a significant biological component.2.5 points?QUESTION 10Even though there is a carbon cycle, it now appears that CO2 levels are rising around the world. Which of the following best explains this?The destruction of coral reefs leads to increased levels of CO2.More CO2 is being given off by ocean waters as they heat up.The burning of fossil fuels- releases large amounts of CO2, thus increasing the average concentration of CO2 in the atmosphere. *As the atmosphere heats up, it can contain more CO2.2.5 points?QUESTION 11The process in which two species battle for resources until one is driven locally extinct is called:competitive exclusion.parasitism.mutualism.resource partitioning.2.5 points?QUESTION 12In the interaction between two types of organisms in a habitat, one organism benefits from its interaction from the other but the other organism suffers. What is the name for this interaction?destructiveparasitismselectivecommensalism2.5 points?QUESTION 13In a commensal relationship:one species provides nutrients, usually cellulose, for the other.neither species is benefited nor is harmed, but the community itself benefits.one species benefits while the other neither benefits nor is harmed. *neither species is benefited nor is harmed, and the community itself is neither benefited nor harmed.2.5 points?QUESTION 14Which one of the following is most likely a density-independent growth regulator of human populations?food shortageDiseaseLack of habitatFire and flood2.5 points?QUESTION 15Which of the following terms describes all organisms on Earth plus their environments?biosphereecosystemhabitatspecies2.5 points?QUESTION 16The biosphere can be divided into several major terrestrial and aquatic life zones calledbiomes.ecosystems.habitats.populations2.5 points?QUESTION 17Which of the following is not a major terrestrial biome?grasslandtropical forestpolar regionsdesert2.5 points?QUESTION 18The biome defined as a standing body of fresh water of variable size is theestuary.oceanriverlake.2.5 points?QUESTION 19The size of a population can be decreased byhigher birth rateimmigration.emigration.increase in food availability2.5 points?QUESTION 20The maximum population size that can be supported indefinitely by an environment is known asmaximum increase.carrying capacity.exponential growthpopulation balance.2.5 points?QUESTION 21The term population density describes theintelligence of the organisms.number of individuals species per unit area.number of populations per unit area.number of species per unit area.2.5 points?QUESTION 22A population will remain at a constant size when emigration equals immigration andfood is not a limiting factor.births equal deaths.predators leave the area.available space remains the same.2.5 points?QUESTION 23The top of the “S” in an S-shaped curve indicates that the populationis about to decline rapidly.is experiencing abnormally heavy losses from predators.has reached its carrying capacity.is poised for further exponential growth2.5 points?QUESTION 24Which one of the following is most likely a density-dependent growth regulator of animal populations?FireshurricanesDiseaseFlood2.5 points?QUESTION 25Which one of the following is most likely a density-independent growth regulator of human populations?Food shortageDiseaseLack of habitatFire and flood2.5 points?QUESTION 26Which of the following symbols represents a mutualistic relationship?+/-+/+o/+-/-2.5 points?QUESTION 27What type of population interaction benefits neither population?competitionpredationherbivoryparasitism2.5 points?QUESTION 28The first law of thermodynamics states that energy is constant; it canbe transferred and transformed but not created or destroyedbe produced and generated; moved or relocated.hustle; flowbe increased and decreased; eliminated2.5 points?QUESTION 29The energy currency used by cells is ————-ADPATPAMPadenosine2.5 points?QUESTION 30Cellular respiration is the process by which:oxygen is produced during metabolic activity.light energy is converted into kinetic energy.oxygen is used to transport chemical energy throughout the body.energy from the chemical bonds of food molecules is captured by an organism.2.5 points?QUESTION 31Glycolysis:is not performed in plants, which get their energy solely through photosynthesis.occurs in all cells.is performed solely on the glucose ingested by the organism.is also referred to as the Krebs cycle.2.5 points?QUESTION 32Three different metabolic pathways are responsible for the production of ATP. What are they?glycolysis, oxidation, and the Calvin cycle reactionshydrolysis, active transport, and the light reactionsglycolysis, the reactions on the electron transport chain, and the Krebs (citric acid) cyclesubstrate inhibition, catabolism, and fermentation2.5 points?QUESTION 33In glycolysis, The molecule of glucose containing six carbons is converted to two molecules of containing three carbons each. This reaction also yields two molecules of and two molecules oflactic acid; 02; acetaldehydepyruvate; ATP; NADHacetyl-CoA; ADP; Pigalactose; H2O; ATP2.5 points?QUESTION 34Which of the following statements about glycolysis is INCORRECT?It occurs in the cytoplasm of the cell.It requires oxygen.It results in the oxidation of glucose.It generates ATP.2.5 points?QUESTION 35During the Krebs cycle:(citric acid cycle)the products of glycolysis are further broken down, generating additional ATP and the high-energy electron NADH.cellular respiration can continue even in the absence of oxygen.the products of glycolysis are completely converted into ATP.the products of glycolysis are further broken down, generating additional ATP and the high-energy electron NADPH.2.5 points?QUESTION 36Fermentation reactions generally occur under conditions of:low glucose levels.high oxygen concentrations.low methane concentrations.low oxygen concentrations.2.5 points?QUESTION 37Which of the following statements about fermentation is NOT correct?Fermentation is a less efficient energy producer than aerobic respiration.Fermentation is an anaerobic process.In fermentation, oxygen is not used as final electron acceptor.All of the above are correct.2.5 points?QUESTION 38Which of the following fermentation methods can occur in animal skeletal muscles?lactic acid fermentationalcohol fermentationmixed acid fermentationpropionic fermentation2.5 points?QUESTION 39Species with limited resources usually exhibit a(n) ————- growth curvelogisticlogicalexperimentalexponential2.5 points?QUESTION 40The majority of the water found on Earth isicewater vaporfresh watersalt water2.5 points?Click Save and Submit to save?cienceBiologyBIOL 130
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