ch 1 homework Essay examples

Please answer the following questions. Download as a word document into the assignments folder assigned for CH 1 homework. Due by July 12, 2015
1. What are the levels of life’s organization?
1. atom- Atoms are fundamental units of all substances, living or not.
2. molecule- Atoms joined in chemical bonds.
3. cell- The cell is the smallest unit of life.
4. tissue- Organized array of cells and substances that interact in a collective task.
5. organ- Structural unit of interacting tissues. Flowers are the reproductive organs of many plants.
6. organ system-A set of interacting organs.
2. Explain the differences in life’s diversity as explained on page 8. (use bold words and elaborate)
Organisms can by classified into broad groups depending on whether they have a nucleus. Bacteria and archaea are both single-celled organisms that lack a nucleus. As a group they are the most diverse organisms: Different kinds are producers or consumers in nearly all regions of the biosphere. Traditionally organisms without a nucleus were called prokaryotes, but this designation is an informal one. They are not that closely related, and archaea is actually more closely related to eukaryotes, an organism that has a nucleus. Some eukaryotes live as individual cells or multi-celled. Eukaryotic cells are typically larger and more complex than bacteria or archaea. Protists are the simplest eukaryotes. As a group they vary a great deal from single-celled consumers to giant, multicelled producers. Most fungi, such as the types that form mushrooms, are multicelled eukaryotes, but many are decomposers. Plants are multicelled eukaryotes that live on land or in freshwater enviornments. They can photsynthesis their own food and also serve as food for other organisms. Animals are multicelled consumers that ingest tissues or juices of other organisms. The three breakdowns in the life cycles are Bacteria, Archaea, and Eukaryotes.
3. Define the bold words in the textbook
a. Biology- The scientific study of life
b. Atom- Fundamental building block of all matter
c. Biosphere- All regions of Earth where organisms live
d. Cell- Smallest unit of life
e. Community- All populations of all species in a given area
f. Ecosystem- A community interacting with its environment
g. Emergent property- A characteristic of a system that does not appear in any of the system’s component parts
h. Molecule- An association of two or more atoms
i. Organ- In multicelled organisms, a grouping of tissues engaged in a collective task
j. Organ system- In multicelled organisms, set of organs engaged in a collective task that keeps the body functioning properly
k. Organism- Individual that consists of one or more cells
l. Population- Group of interbreeding individuals of the same species that live in a given area
m. Tissue- In multicelled organisms, specialized cells organized in a pattern that allows them to perform a collective functions
n. Consumer- Organisms that gets energy and

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