chapter 1-5 review

Topics: Atom, Cell, Organelle Pages: 2 (858 words) Published: September 24, 2014
Casandra De Amicis
Biology Review #1
1. The basic unit of structure and function for life is atoms 2. The levels of organization for an organism are: atoms, molecules, cell, tissue, organ, organ system, organisms, population, community, ecosystems, and biosphere 3. The characteristics of living organisms are;

a. Life is organized
b. Life uses materials and energy
c. Life reproduces
d. Life is homeostatic
4. The major driving force behind evolution is; natural selection (brings about adaptation to the environment) 5. Eukaryotic, multi cellular organisms that ingest their own food belong to Eukaryia 6. The definition of population is; organisms of the same species occupying a certain area 7. Directly or indirectly all organisms ultimately obtain their energy from the sun 8. The steps in the scientific method are:

a. Making decisions
b. Formulating a hypothesis
c. Performing experiments and making observations
d. Coming to a conclusion
9. The definition of homeostasis is; cells and organisms have an internal environment and that the cells regulate the environment so that it stays fairly constant 10. When an organisms DNA is permanently altered we say that it mutates 11. The elements that are predominately found in living organisms are: a. Tissue- cells combine to form tissue

b. Organs made up by tissues
c. Organ systems- how organs work together
12. Protons are positively charged
13. Atomic number is: the number of protons within the nucleus of an atom 14. The mass number of an atom is determined by the presence of protons and neutrons, both of which are assigned one atomic mass unit 15. The factor that determines whether an atom will be chemically reactive is the valence shell (an atoms outer shell) 16. The bond that results from sharing of electrons is a covalent bond 17. An ionic bond is a chemical bond in which ions are attracted to one another by opposite charges (negative and positive) 18. The interaction that causes water molecules is...
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