Question: Considering biology, how can something be alive?.
- Cell Theory: Must have at least one i.: Uni-Cellular, Multi-Cellular; Cells come from other Pre-existing Cells. Nothing .
can come from nothing. .
- Properties of life Respond to Environment: ability to sense their internal and external environment. .
- Properties of life Grow and Reproduce: Grow: can get bigger, increase number of cells, etc. Reproduce: either asexual or sexual. * .
- Everything has Genetic Material that can be passed on.
- Properties of life Obtain and use Energy.
- Properties of Life Maintain Physiologically. .
- Properties of Life-Adapt .
Levels of Organization.
Atoms: Molecules - Cells = the basic unit of life.
Question: What are cells made of? .
A: Carbon, Hydrogen, Nitrogen, Phosphorus, Oxygen, S?.
Organism Level.
Tissues > Organs > Organ Systems > Organism.
Population Level.
Individual > Population > Community > Ecosystem > Biosphere.
Sequence of amino acids in each protein determines the shape:.
Different shapes = different functions.
Why are proteins important?.
Proteins are critical to structure and metabolism of all living organisms. .
Enzymes: Accelerate biochemical reactions.
Structural: Form biological structures.
Transport: Carry biochemically important substances.
Defense: Protect the body from foreign invaders. .
Heredity - How genes are passed from one generation to the next.
Chromosomes are passed from parents to offspring in the egg and sperm (gametes).
23 pairs - 46 total.
(22 are numbered) #23 is either X (Male) Y (Female).
Gametes are produced during the process of meiosis.
Diploid (Parent): Two sets of chromosomes > Meiosis > Haploid (Gametes): one set of chromosomes > Fertilization > .
Diploid (Zygote): Two sets of chromosomes.
Sperm and eggs contain 1/2 the "Normal " amount of DNA.
Objective Questions.
What is a gene?.
How do genes control traits?.
how are genes passed from one generation to the next?.
Objectives.