Unit 2

Chapter 4: The Internal Environment of Organisms

The goals of this chapter are:

  1. to help you to understand that living organisms have different levels of compartmentalization
  1. to help you to understand that the external environment can cause changes in the internal environment of living things
  1. to help you design a controlled experiment, collect and organize data using instrumentation, and develop a more complete understanding about how to conduct scientific inquiry.

Schedule: Assignments:

Tues. 10/29 Overview of Ch. 3; Go over Ch. 1 and 2 Test

Wed. 10/30 Engage: Can You Stand the Heat?, p. 150Read p. 150-151,167

Answer Process and Procedure
Question 2 and Analysis question 1, p. 150

Due: Tuesday, Oct. 29

Wed. 10/30 Explore: Cells in Action p. 150Read Compartments, p.222

Thurs. 10/31and answer the questions

Mon. 11/4Due: Tuesday, Oct. 29

Mon. 11/4 Explain: A Cell Model, p. 161Read Membranes, p.224

Tues. 11/5 “A Cell Model” Write-Up Dueand answer the questions

Wed. 11/6 Monday, Nov. 11 Due: Thursday, Oct. 31 Read Molecular Movement, p. 226

and answer the questions

Due: Tuesday, Nov. 5

Explore Learning Gizmo Homeostasis

Due: Wednesday, Nov. 6

Thurs. 11/7 Elaborate: Cell Size and Diffusion

Mon. 11/11 Chapter 4 Quiz

Critical Thinking Problem

Compartments, p. 222

  1. What forms the boundary of compartments in cells?
  1. What is the function of the cell wall in plants and bacteria?
  1. What is the difference between compartments in prokaryotic and eukaryotic organisms?
  1. What does the nucleus contain?
  1. What is the advantage of having many compartments in living systems? Give examples of advantages due to compartments.

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Membranes, p. 224

  1. Why are biological membranes said to be selectively permeable?
  1. Describe the structure of a typical cell membrane?
  1. What is the function of the lipid bilayer in a cell membrane?
  1. What are the functions of proteins in a cell membrane?

Molecular movement, p. 226

  1. Molecules move from areas of ___ concentration to areas of ____ concentration, or ____ the concentration gradient. This is called ____.
  1. What is osmosis?
  1. Describe what would happen to a cell placed in a water concentration that is greater on the outside of the cell than the inside.
  1. Describe what would happen to a cell placed in a water concentration that is lower on the outside of the cell than the inside.
  1. What is happening in a vacuole when a leaf wilts?
  1. What is passive transport?
  2. What is active transport?