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Mini DBQ: Ecosystem Energy Flow
Background: Ecosystems maintain themselves by cycling energy and nutrients obtained from
external sources.
Task: Using the document provided, describe the process in which energy flows through an ecosystem.

Your response must address the following:
What factors make up an ecosystem?
What are the trophic levels in an ecosystem in order from largest to smallest?
How does energy flow through trophic levels? How much energy is lost with each transition?
How is the flow of matter and energy in an ecosystem important in terms of the interdependence of organisms on one another and their environment?

Pre-Write Brainstorming: Use Document A to fill out the boxes below:
Observations: What do you see?
Inferences: What do you think is happening?
Question: How is energy flowing through this food chain?
Question: What would happen to the mouse population if the mountain lion population decreased?

Response:

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.