Presentation on theme: " a Order b Regulation c Growth and development d Energy utilization THE SCOPE OF LIFE The Properties of Life."— Presentation transcript:
a Order b Regulation c Growth and development d Energy utilization THE SCOPE OF LIFE The Properties of Life
e Response to the environment f Reproduction g Evolution THE SCOPE OF LIFE The Properties of Life
–Biologists explore life at levels ranging from the biosphere to the molecules that make up cells. Life at Its Many Levels Biosphere Ecosystems Communities Populations Organisms Organ Systems and Organs Tissues Cells Organelles Molecules and Atoms Atom Nucleus
Life in Its Diverse Forms –Diversity is the hallmark of life. The diversity of known life includes 1.8 million species. Estimates of the total diversity range from 10 million to over 100 million species.
Grouping Species –Biodiversity can be beautiful but overwhelming. –Taxonomy is the branch of biology that names and classifies species. The Three Domains of Life The three domains of life are –Bacteria –Archaea –Eukarya
Chemistry of Life –Matter is anything that occupies space and has mass. –Matter is found on the Earth in three physical states: Solid Liquid Gas
–Matter is composed of chemical elements. Elements are substances that cannot be broken down into other substances. Chemistry of Life Change the number of PROTONS in the nucleus and you change the ELEMENT
Atoms Nucleus Protons Neutrons Electrons Nucleus Cloud of negative charge 2 electrons 2 2 2 –Each element consists of one kind of atom. An atom is the smallest unit of matter that still retains the properties of an element.
–Elements differ in the number of subatomic particles in their atoms. The number of protons, the atomic number, determines which element it is. An atom’s mass number is the sum of the number of protons and neutrons. Mass is a measure of the amount of matter in an object. Chemistry of Life
Periodic Table of the Elements Atomic number = number of protons within the nucleus Other nonmetals Halogens Noble gases Other metals Rare earth metals Transition metals Alkali earth metals Alkali metals Synthetic Gas Liquid Solid Legend
Chemistry of Life Carbon C : 18.5% Hydrogen H : 9.5% Nitrogen N : 3.3% Calcium Ca : 1.5% Trace elements: less than 0.01% Boron B Manganese Mn Oxygen O : 65.0% Magnesium Mg : 0.1% Phosphorus P : 1.0% Potassium K : 0.4% Sulfur S : 0.3% Sodium Na : 0.2% Chlorine Cl : 0.2% Cobalt Co Chromium Cr Iron Fe Iodine I Fluorine F Copper Cu Silicon Si Zinc Zn Vanadium V Tin Sn Molybdenum Mo Selenium Se –Twenty-five elements are essential to life. –Four elements make up about 96% of the weight of the human body: Oxygen Carbon Hydrogen Nitrogen