Introduction to Biology: The Science of Life

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Sharp Tutor Tue, Jan 25, 2022 08:16 AM UTC

1. Study the origins and history of life and once-living things
2. Study the structures of living things
3. Study how living things interact with one another
4. Study how living things function

2. Chapter 1 The Study of Life
1.1 Introduction to Biology
Biology—the science of life
 Study the origins and history of life and
once-living things
 Study the structures of living things
 Study how living things interact with one
another
 Study how living things function

3. Chapter 1 The Study of Life
1.1 Introduction to Biology
What do biologists do?
 Study the diversity of life
 Research diseases
 Develop technologies
 Improve agriculture
 Preserve the environment

4. Chapter 1 The Study of Life
1.1 Introduction to Biology
The Eight Characteristics of Life
1. Made of one or more cells
2. Displays growth
3. Grows and develops
4. Reproduces

5. Chapter 1 The Study of Life
1.1 Introduction to Biology
The Eight Characteristics of Life
5. Responds to stimuli
6. Requires energy
7. Maintains homeostasis
8. Adaptations evolve over time

6. Chapter 1 The Study of Life
1.1 Introduction to Biology
 Living things are made of one or more cells.
 Cells are the basic unit of structure and
function in all living things.

7. Chapter 1 The Study of Life
1.1 Introduction to Biology
Displays Organization
 Living things also display organization, which
means they are arranged in an orderly way.
 Specialized cells are organized into groups
that work together called tissues.
 Tissues are organized into organs.
 Organ systems work together to support
an organism.

8. Chapter 1 The Study of Life
1.1 Introduction to Biology
Grows and Develops
 Growth results in the addition of mass to
an organism and, in many organisms, the
formation of new cells and new structures.

9. Chapter 1 The Study of Life
1.1 Introduction to Biology
Reproduces
 A species is a group of organisms that can
breed with one another and produce fertile
offspring.

10. Chapter 1 The Study of Life
1.1 Introduction to Biology
Responds to Stimuli
 Anything that is part of
the internal or external
environments and causes
some sort of reaction by
the organism is called a
stimulus. Venus flytrap
 The reaction to a stimulus is a response.

11. Chapter 1 The Study of Life
1.1 Introduction to Biology
Requires Energy
 Living things get their energy from food.
 Most plants and some unicellular organisms
use light energy from the Sun to make their
own food and fuel their activities.
 Organisms that cannot make their own food
get energy by consuming other organisms.

12. Chapter 1 The Study of Life
1.1 Introduction to Biology
Maintains Homeostasis
 Regulation of an organism’s internal
conditions to maintain life is called
homeostasis.
 If anything happens within or to an
organism that affects its normal state,
processes to restore the normal state
begin.

13. Chapter 1 The Study of Life
1.1 Introduction to Biology
Adaptations Evolve Over Time
 An adaptation is any inherited characteristic
that results from changes to a species over
time.

14. Chapter 1 The Study of Life
1.2 The Nature of Science
What is science?
 Science is a body of knowledge based on the
study of nature.
 The nature, or essential characteristics, of
science is scientific inquiry.
 Scientific inquiry is both a creative process and
a process rooted in unbiased observations and
experimentation.

15. Chapter 1 The Study of Life
1.2 The Nature of Science
Uses Scientific Theory
 A theory is an explanation of a natural
phenomenon supported by many
observations and experiments over time.
 The results are always the same.

16. Chapter 1 The Study of Life
1.2 The Nature of Science
Expands Scientific Knowledge
 Most scientific fields are guided by research
that results in a constant reevaluation of what
is known.
 This reevaluation often leads to new
knowledge that scientists then evaluate.

17. Chapter 1 The Study of Life
1.2 The Nature of Science
Challenges Accepted Theories
 Scientists welcome debate about one
another’s ideas.
 Sciences advance by accommodating
new information as it is discovered.

18. Chapter 1 The Study of Life
1.2 The Nature of Science
Questions Results
 Observations or data that are not consistent with
current scientific understanding are of interest to
scientists.
 These inconsistencies often lead to further
investigations.

19. Chapter 1 The Study of Life
1.2 The Nature of Science
Tests Claims
 Science-based information makes claims
based on a large amount of data and
observations obtained from unbiased
investigations and carefully controlled
experimentation.
 Conclusions are reached from the evidence.

20. Chapter 1 The Study of Life
1.2 The Nature of Science
Undergoes Peer Review
 Before it is made public, science-based
information is reviewed by scientists’ peers.
 Peer review 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.

21. Chapter 1 The Study of Life
1.2 The Nature of Science
Uses Metric System
 Scientists can repeat the work of others as
part of a new experiment.
 The metric system uses units with divisions
that are powers of ten.

22. Chapter 1 The Study of Life
1.2 The Nature of Science
Science in Everyday Life
 A person who is scientifically literate combines
a basic understanding of science and its
processes with reasoning and thinking skills.
 Ethical issues must be addressed by society
based on the values it holds important.

23. Chapter 1 The Study of Life
1.3 Methods of Science
Ask a Question
 Scientific inquiry begins with observation.
 Science inquiry involves asking questions
and processing information from a variety
of reliable sources.

24. Chapter 1 The Study of Life
1.3 Methods of Science
Form a Hypothesis
 A hypothesis is a testable explanation of a
situation.
 When a hypothesis is supported by data
from additional investigations, usually it is
considered valid and is accepted by the
scientific community.

25. Chapter 1 The Study of Life
1.3 Methods of Science
Collect the Data
 When a biologist conducts an experiment,
he or she investigates a phenomenon in a
controlled setting to test a hypothesis.

26. Chapter 1 The Study of Life
1.3 Methods of Science
Controlled Experiments
 A control group in an experiment is a group
used for comparison.
 The experimental group is the group exposed
to the factor being tested.

27. Chapter 1 The Study of Life
1.3 Methods of Science
Experimental Design
 Independent variable—only one factor in a
controlled experiment can change at a time.
 Dependent variable—results from or depends
on changes to the independent variable.

28. Chapter 1 The Study of Life
1.3 Methods of Science
Data Gathering
 Data—information gained from observations.
 Quantitative data can be measurements of
time, temperature, length, mass, area, volume,
density, or other factors.
 Qualitative data are descriptions of what our
senses detect.

29. Chapter 1 The Study of Life
1.3 Methods of Science
Analyze the Data
 A graph of the data
makes the pattern
easier to grasp.
 Even when a
hypothesis has not
been supported, it
is valuable.

30. Chapter 1 The Study of Life
1.3 Methods of Science
Report Conclusions
 If the reviewers agree on the merit of the
paper, then the paper is published for review
by the public and use by other scientists.

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