Introduction to Biology I: Week 1
Introduction to Biology I: Week 1 BIOL 107-06
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This 3 page Class Notes was uploaded by Elizabeth Schnarr on Wednesday August 24, 2016. The Class Notes belongs to BIOL 107-06 at Truman State University taught by Daniela Ostrowski in Fall 2016. Since its upload, it has received 42 views. For similar materials see Introduction to Biology I in Biology at Truman State University.
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Date Created: 08/24/16
Week 1: 8/23 8/29 Biology Lecture 1: Biology Q: What is life? A: They… 1) Acquire and use energy 2) Are made up of one or more cells 3) Process information 4) Are capable of replication 5) Are a product of revolution Levels of Life Biosphere → Ecosystem → Community → Population → Organism → Organ → Tissue → Cell → Organelle → Molecule ● Taxonomy science of classification Prokaryotes Eukaryotes Before nucleus True nucleus Smaller, simpler Bigger Ex: bacteria Ex: plants, animals, fungi, etc. Domains Bacteria, Archaea, Eukaryotes (have 4 kingdoms) EVERY LIVING ORGANISM HAS DNA DNA → RNA → Proteins Week 1: 8/23 8/29 Classification Kingdom → Phylum → Class → Order → Family → Genus → Species ● Tree of Life a family tree that describes the relationship among species rRNA is comprised of four chemical units (A, U, C, and G) caled ribonucleotides Evolution Theory ● Changes in the characteristics of a population (group of individuals) over time 2 conditions must be met for natural selection: 1. Individuals must vary in characteristics that are heritable 2. In a certain environment versions of traits help individuals reproduce more ● Humans use artificial selection to interfere and select individuals that will produce the most offspring Hypothesis ● Tentative answer to wellreasoned question: 1. Testable checks validity 2. Falsifiable would reveal if hypothesis isn’t true (“null hypothesis”) 3. Must be written as a declarative statement Week 1: 8/23 8/29 Biology Lecture 2: Chemistry Definitions: ● Matter anything that occupies space and has mass ● Elements cannot be broken down into any simpler substance during an ordinary chemical reaction ● Compound substance consisting of two or more different elements Atoms ● Nucleus center composed of protons (p+) and neutrons (n0) ● Electrons negatively charged particles (e) orbiting an atom’s nucleus Oxygen, Carbon, Hydrogen, and Nitrogen make up 96% of elements in the human body 4 ← Mass number Mass number= number of protons and neutrons 2He ← Atomic number tomic number= number of protons ● Isotopes atoms of the same element but different number of neutrons
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