Properties/Characteristics of living things (LT) 1. Cellular organization - made of 1 or more cells...
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Transcript of Properties/Characteristics of living things (LT) 1. Cellular organization - made of 1 or more cells...
Properties/Characteristics of living things (LT)
1. Cellular organization - made of 1 or more cells
2. Reproduction - able to reproduce
3. Metabolism - obtain/use energy to run life processes
4. Homeostasis - maintain consistent internal environ
5. Heredity - pass traits to offspring
6. Responsiveness - respond/adjust to environment
7. Growth and development - grow/develop
Section 1-1
Cell Structure/Function:•All LT are made of 1 or more cells•Cell is smallest unit of life, yet complex•Membrane surround/protect all cells
Reproduction:•Organism makes more of its own kind from one generation to the next
Section 1-1
Metabolism:•Sum of all chemical reactions carried out by an organism•Almost all energy used by a LT was originally captured from sunlight
Homeostasis:•Maintain constant internal environment w/in cell•If unable to maintain homeostasis, then organism may become ill and die
Section 1-1
Heredity:•Passing of traits (genes) from parent to offspring•Genes are encoded in DNA deoxyribonucleic acid•Change (∆) in DNA is a mutation and most are harmful, but some may help organism to survive
Evolution:•∆ in species over a very long period of time•Species are similar organisms that can produce fertile offspring•Natural selection occurs in organisms w/ favorable traits that help them survive/reproduce
Section 1-1
Ecology/Interdependence:•Organisms are dependent on each other and their environment•Ecology studies interactions of organisms w/ one another and w/ nonliving parts of the environment
Section 1-1
Ways Biology is Making Our Life Better
•Preserving our environment
•Improving food supply
•Understanding human genome
•Fighting disease
Section 1-2
Preserving our Environment:•Conservation biologists are exploring ways to achieve a balance between people’s growing need for land and the need to preserve the environment.
Improving Food Supply:•Genetic engineering of plants has made some resistant to herbicides, or poisonous to pests, or more nutritious.
Section 1-2
Understanding Human Genome:•Genome is the complete genetic material contained in an individual. Government-funded and private research teams completed sequencing of the human genome on 4/14/2003; ≈30,000 genes
Section 1-2
Fighting Diseases (dz):•AIDS: dz caused by HIV; virus attacks/destroys immune system •Cancer: growth defect in cells; breakdown of mechanism that controls cell ÷ •Biologists are fighting new dz not known in the past (West Nile virus, mad cow dz)•Gene Therapy: replace defective gene w/ normal one. Researchers believe it is possible to use a virus to transfer normal copy of a gene into a cell (Cystic fibrosis CF, Muscular dystrophy MD)
Section 1-2
Scientific Process/Method:
Section 1-3
Observation: act of noting/perceiving objects/events using the senses
TASTE
Section 1-3
Observations Lead to Questions:
•Hypothesis: explanation that might be true; statement that can be tested by additional observations or experimentation•Prediction: expected outcome of a test, assuming hypothesis is correct
Section 1-3
Testing the Hypothesis:•Experiment: planned procedure to test hypothesis•Control group : group in experiment that receives no experimental tx; necessary for comparing results of experiment•Independent variable: factor that’s changed in experiment•Dependent variable: variable measured in experiment, its outcome depends on what is done to independent variable.
Section 1-3
Section 1-3
Drawing Conclusions:•Once data are collected/analyzed, conclusion is made as to whether data support hypothesis•Theory: set of related hypotheses tested and confirmed many times by many scientists •Theory unites/explains a broad range of observations•Word theory is used by general public means a guess, or lack of certainty, but in science a theory is a well-supported scientific explanation that