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Answer KeyVocabulary PracticeA. Categorize Words1. organism, L; cell, L;C. Stepped-Out Vocabulary1. scientific study of allspecies, L; transgenic, B;biotechnology, T; moleculargenetics, T2. homeostasis, I; biosphere,E; system, B; metabolism,I; ecosystem, E; biology, B2.3. biodiversity, G; organism,I; cell, B; adaptation, B;biosphere, G; evolution, GB. Vector Vocabulary1. using tools and senses to3.study the world2. many support, and are3.4.Copyright by McDougal Littell, a division of Houghton Mifflin Company5.6.7.8.9.10.11.12.13.14.15.accounted for bycan lead toa proposed explanation for awide range of observationssupported by a large amountof evidencea proposed answer for ascientific questiontested throughstudy of independentand dependent variablesto find cause-and-effectrelationshipsscientists manipulatescientists measurescientists controlcondition that is changedto observe an effect on thedependent variablefactors that are observed;affected by independentvariableconditions that are keptfrom changing during anexperimentcollected asobservations that arerecorded and analyzed totest a hypothesis4.5.6.7.organisms; helps to makeinformed decisions; stillhas many unansweredquestionstool that provides anenlarged image of anobject; led to discoveryof cells; electronmicroscopes providegreater magnifications thanlight microscopeschange in living things overtime; change in geneticmakeup of a population;accounts for unity anddiversity of lifean inherited trait thatgives an advantage to anindividual organism; passedon to future generations;different adaptations indifferent environmentsthe genetic material in allorganisms; instructions forgrowth and development;passed on throughreproductionsegment of DNA thatstores genetic information;studied and changedthrough molecular genetics;faulty ones can be replacedstudy and comparisonof genomes; computerdatabases store theinformation; entire DNAsequences from organisms7. explains many observations8. both living and nonliving9.10.11.12.thingsnear the equatora type of living thing thatcan reproduceit has genes from differentspeciespropose an answer to aquestionD. Words in Context1. too small to be seen2. maintenance of constant3.4.5.6.conditionsthe causesegment of DNAinherited traitkept the sameAnswer Key1

CHAPTERBIOLOGY IN THE 21ST CENTURYVocabulary Practicebiosphereecosystemdependent rvationgenecelldatamolecular iotechnologysystemindependent variabletransgenicCHAPTER 1Biology in the 21st Century1A. Categorize Words For the terms below, write L next to words that can describeliving things. Write T next to words that can describe technology. Write B next to wordsthat can describe both.Copyright McDougal Littell/Houghton Mifflin icmolecular geneticsFor the terms below, write E next to words that can describe the external environment ofliving things. Write I next to words that can describe the internal environment of livingthings. Write B next to words that can describe smbiologyFor the terms below, write G next to words that are related to groups of living things. Write Inext to words that describe individual living things. Write B next to words that can aptationevolutionUnit 1 Resource BookMcDougal Littell BiologyVocabulary Practice27

CHAPTER 1Biology in the 21st CenturyVOCABULARY PRACTICE, CONTINUEDB. Vector Vocabulary Define the words in the boxes. On the line across each arrow,write a phrase that describes how the words in the boxes are related to each IMENT8.9.Copyright McDougal Littell/Houghton Mifflin Company.7.10.INDEPENDENT VARIABLEDEPENDANT VARIABLECONSTANT11.12.13.14.DATA15.28Vocabulary PracticeUnit 1 Resource BookMcDougal Littell Biology

VOCABULARY PRACTICE, CONTINUEDWORDDEFINITIONMORE INFORMATIONExample metabolismall chemical processes thatbuild up or break down materialsin living thingschemical energy is neededanimals eat other organismsto get their chemical energyCHAPTER 1Biology in the 21st CenturyC. Stepped-Out Vocabulary Define each word. Then write two additional factsthat are related to the word.1. biology2. microscope3. evolutionCopyright McDougal Littell/Houghton Mifflin Company.4. adaptation5. DNA6. gene7. genomicsUnit 1 Resource BookMcDougal Littell BiologyVocabulary Practice29

CHAPTER 1Biology in the 21st CenturyVOCABULARY PRACTICE, CONTINUEDD. Words in Context Answer the questions to show your understanding of thevocabulary words.1. If I use a microscope, do I see things too small to be seen or things too far away tobe seen?2. Is homeostasis the maintenance of constant conditions or all of the chemical processesthat build up and break down materials?3. Which is the independent variable in an experiment, the cause or the effect?4. Is a gene all of an organism’s DNA or only a segment of DNA?5. Is an adaptation in biology made by choice or is it inherited?6. Would a constant be manipulated or kept the same in an experiment?8. When I am in an ecosystem, do I interact with living things, nonliving things, or bothliving and nonliving things?9. Where would more biodiversity be found, near Earth’s equator or near Earth’s poles?10. Which is a species, a group of parts that interact to form a whole or a type of livingthings that can reproduce by interbreeding?11. Does a transgenic organism travel a lot or does it have genes from a different type ofliving thing?12. If I form a hypothesis, do I propose an answer to a question or do I use negativefeedback?30Vocabulary PracticeUnit 1 Resource BookMcDougal Littell BiologyCopyright McDougal Littell/Houghton Mifflin Company.7. Does a theory answer one scientific question or does it explain many observations?

7. study of independent and dependent variables to find cause-and-effect relationships . 28 Vocabulary Practice Unit 1 Resource Book McDougal Littell Biology CHAPTER 1 Biology in the 21st Century . McDougal Littell Biology CHAPTER 1 Biology in the 21st Century

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