Chapter 1: The Study of Life

Section 1: Introduction to BiologySection 2: The Nature of ScienceSection 3: Methods of Science

• Section 1: All living things share the characteristics of life.

• Section 2: Science is a process based on inquiry that develops explanations.

• Section 3: Biologists use specific methods when conducting research.

Essential Questions• What is biology?

• What are possible benefits of studying biology?

• What are the characteristics of living things?

• What are the characteristics of scientific inquiry?

• What are the differences between science and pseudoscience?

• Why is scientific literacy important?

• What are the differences between an observation and an inference?

• What are the differences among a control, independent variable, and dependent variable?

• What are the scientific methods a biologist uses for research?

• Why are the metric system and SI important?

Review• environment• investigation• theory

New• biology• organism• organization• growth• development• reproduction• species• stimulus• response• homeostasis• adaptation• science

New continued

• theory• law• peer review• ethics• observation• inference• scientific method• hypothesis• experiment• control group• experimental group• independent variable• dependent variable• constant• data• metric system• SI

Vocabulary

Introduction to Biology

Section 1

All living things share the characteristics of life

KWhat I Know

WWhat I Want to Find Out

LWhat I Learned

Main Idea

Essential Questions• What is biology?

• What are possible benefits of studying biology?

• What are the characteristics of living things?

Review

environment

Vocabulary

Newbiologyorganismorganizationgrowthdevelopmentreproductionspeciesstimulusresponsehomeostasisadaptationscience

• Biology comes from the Greek ____, meaning “___”, and from logos, meaning “________”

• Whenever you see –ology, it means “the study of”

• In Biology we study:

• The origins and history of life, both past and present

• The ________ of living things

• How living things interactive with one another

• How living things _____________

BIO - - LOGY ???

A biologist does what???• Study the ____________ of life

• Research diseases – medical biologist

• Develop and refine technologies - biotechnology

• Improve agriculture

• Preserve the environment

__________ had or have all of the characteristics of life:• Made of _____ or more cells

• Cells are the basic unit of all living things – the building blocks• One cell = unicellular; more than one cell = multicellular

• Displays __________• They arrange in an orderly way• Unicellular contain organized functional structures and often work together;

multicellular have specialized cells organized into tissues, tissues organized into organ, organs organized into organ systems that work together to support life

• _________ and develops• Most everything starts as a single cell• Mass is then added (usually by added new cells) through cell growth, and

have natural changes over organism’s lifetime that is called development

• _____________________• Make offspring!• Species are organisms that can breed to produce fertile offspring

Characteristics of Life

• Responds to ____________• ___________ = anything that causes a reaction (response) by the organism

• Requires _______________• _________ provides energy• Most plants use light energy from the Sum to make their own

(photosynthesis); organisms that don’t make their own get it by consuming others (that leads back to something that does)

• Maintains _______________• A balance and regulation of internal conditions

• Adaptations evolve over time• = inherited characteristic that allows species to survive more efficiently• Usually caused by a change in environment

Characteristics of Life, cont.

Match the correct scenario to its corresponding characteristic of life

Characteristic of Life

• Responds to stimuli

• Maintains homeostasis

• Adaptations evolve over time

• Requires energy

Scenario

• A cheetah responds to the need for food by chasing a gazelle. The gazelle responds by running away.

• Many organisms need to take in food, like us; but some make their own.

• Humans perspire to prevent their body temperature from rising too high.

• Tropical orchids have roots that are adapted to life in a soil-less environment.

Review – Did I get it?• Are you able to answer this section’s questions? (from beginning of

section notes)

• Are you comfortable with the vocabulary words from this section?

• Fill in your KWL

The Nature of Science

Section 2

Science is a process based on inquiry that develops explanations

KWhat I Know

WWhat I Want to Find Out

LWhat I Learned

Main Idea

Essential Questions• What are the characteristics of scientific inquiry?

• What are the differences between science and pseudoscience?

• Why is scientific literacy important?

Review

Investigation

Vocabulary

NewScienceTheoryLawPeer ReviewEthics

What is S C I E N C E ???• Science is a body of knowledge based on the study of

nature.

• The nature or essential characteristics, of science is scientific ___________.

• Scientific inquiry is both a creative process and a process rooted in unbiased observations and _______________________.

What is S C I E N C E ???• A _______ is an explanation of a natural phenomenon

supported by many observations and experiments over time.

• A scientific ____describes relationships under certain conditions in nature, but does not explain why the relationship is the way it is.

• Theories do not become laws and laws do not become theories.

Make observations and draw conclusions• Scientists choose subjects to study and decide what

types of data to collect.

• They analyze the data collected and draw conclusions.

Expands knowledge• Scientific explanations combine what is already known

with evidence from additional observations and experiments.

– Driven by the search for new knowledge– Constantly reevaluate what is known

• ____________________ imitate science– Driven by cultural or commercial goal

• Alchemy

– New questions and additional research are not welcomed• THE EARTH IS FLAT! THE SUN ORBITS THE EARTH!

Alchemy

• Psuedoscience - BNTSG Full episode

Challenge accepted theories• Scientists welcome debate about one another’s ideas.

• Sciences advance by accommodating new information as it is discovered

Challenge accepted theories• In science, observations or data that are not consistent

with current scientific understanding are of interest.• These inconsistencies often lead to further

investigations.• In ____________________, inconsistencies are discarded,

or even ignored

Test Claims• Scientists use standard experimental procedures.

• Their claims based on a large amount of data and observations obtained from unbiased investigations and carefully controlled experimentation.

• Pseudoscientists make claims that cannot be tested, or are a mixture of fact and opinion.

Undergoes peer review• Before it is made public, science-based information is

reviewed by scientists’ peers.• __________is a process by which the procedures used

during an experiment and the results are evaluated by other scientists who are in the same field or who are conducting similar research.

Science literacy• A person who is scientifically literate combines a basic

understanding of science and its processes with reasoning and thinking skills.

• ___________is a set of moral principles or values.

Review – Did I get it?• Are you able to answer this section’s questions? (from beginning of

section notes)

• Are you comfortable with the vocabulary words from this section?

• Fill in your KWL

Methods of Science

Section 3

Biologists use specific methods when conducting research

KWhat I Know

WWhat I Want to Find Out

LWhat I Learned

Main Idea

Essential Questions• What are the differences between an observation and an inference?

• What are the differences among a control, independent variable, and dependent variable?

• What are the scientific methods a biologist uses for research?

• Why are the metric system and SI important?

Review

Theory

Vocabulary

NewObservationInferenceScientific methodExperimentControl groupExperimental groupIndependent variableDependent variableConstantDataMetric systemSI

Science literacy• Scientific inquiry begins with _____________.

• Scientific inquiry involves asking questions and processing information from a variety of reliable sources.

• The process of combining what you know with what you have learned to draw logical conclusions is called inferring; the conclusions themselves are called _________________.

• The methods scientists use to gather data and answer questions are referred to as _________________________.

Scientific Method

• Scientific Method is a step-by-step organized plan for gathering, organizing, and communicating information.

STEPS1. Make ______________2. Ask ______________3. Develop ___________4. ____________(

include variables)5. _______Data and Draw _____________

- State if hypothesis is _________or not supported

6. Develop __________

Scientific Method Detailed

• 1&2. Making observations - Information that you obtain from your senses that provides you with a question

• 3. Develop a hypothesis - • ______________– A proposed answer to a question.• It’s used to answer questions raised by one of your observations. In

order for a hypothesis to be useful, it must be testable.

Scientific Method

• 4. Experiment or Testing a Hypothesis – Scientists perform experiments to test a hypothesis. In an experiment, any factor that can change is called a variable.

• Variable- variable that causes change in another variable• Manipulated variable or ____________________variable that causes a

change in another variable.• Responding variable or __________________variable that changes in

response to the manipulated variable.• ___________experiment- An experiment in which only one variable, the

manipulated variable, is deliberately changed at a time. The responding variable is observed for changes, all other variables are kept constant, or controlled.

• 5. Analyze Data and Draw Conclusions – See if your data from you experiment supports your hypothesis. If it does not, you must revise your hypothesis, or propose a new one. Then you must design a new experiment.

Come up with 2 example scenarios and identify their dependent and independent variables

Scientific Method

• 6. Developing a Theory- Once a hypothesis has been supported in repeated experiments, scientists can begin to develop a theory.

SI Units of Measure

• All measurements need a number and a unit.• Example: 5 ft 3 in or 25ºF

• The _________system uses units with divisions that are powers of ten (used in most of the world besides us – use the imperial system

• Scientists usually do not use these units. They use a unit of measure called _____or International System of Units.

• Base Units – more examples on following slide• Length- straight line distance between 2 points is the meter (m)• Mass- quantity of matter in an object or sample is the kilogram (kg)

The International System of Units•

• Organizing Data• Scientists can organize their data

by using data tables and graphs• Data table- the simplest way to

organize data. The table shows two variables - a manipulated variable and the responding variable. 

• Line graph• Line graphs are useful for showing changes that occur in related variables.

It shows the manipulated variable on the x-axis and the responding variable on the y-axis.

• Slope- (steepness) The ratio of a vertical change to the corresponding horizontal change.

• Slope = Rise Run

• Rise represents the change in the y-variable• Run represents the corresponding change in the x-variable.

Direct proportion- Relationship in which the ratio of the two variables is constant.

Inverse proportion- Relationship in which the product of the two variables is constant.

• Bar graphs and pie or circle graphs can also be used to display data.

Review – Did I get it?• Are you able to answer this section’s questions? (from beginning of

section notes)

• Are you comfortable with the vocabulary words from this section?

• Fill in your KWL