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STUDY QUESTIONS: Chapter 6 – A Tour Of The Cell
1) Describe the process and purpose of cell fractionation / centrifugation.
2) Label the prokaryotic cell below –
label / list structures and their functions. (see figure 6.5)
3) Distinguish among the various types of VACUOLES: (explain the structure and function of each)
a) Food vacuole:
b) Contractile vacuole:
c) Central vacuole w/tonoplast:
4) A mitochondrion contains two distinct internal compartments so that the reactions of cellular
respiration occur in separate locations. Explain the structure and function of the following
mitochondrial components:
a) cristae:
b) mitochondrial matrix:
5) Summarize the ENDOSYMBIONT THEORY of the origin of mitochondria & chloroplasts in
eukaryotic cells. (see Figure 6.16)
6) Explain how the cellular organelles known as PEROXISOMES work to detoxify potentially
harmful substances in the liver.
7) For each cytoskeleton component listed below, provide a brief explanation for how the
component’s specific structure allows for the specific function to be accomplished.
MICROTUBULES:
► centrosomes and centrioles
► cilia and flagella – include basal body
► dynein walking
MICROFILAMENTS
► actin
►myosin
► pseudopodia
► cytoplasmic streaming
INTERMEDIATE FILAMENTS
► (explain general structure & function of intermediate filaments)
8) How do cilia and flagella bend?
9) Distinguish among the three layers of cell walls (briefly describe structure & function of each):
► Primary cell wall
► Middle lamella
► Secondary cell wall
10) Describe the function of each of the following components of the extracellular matrix (ECM).
► Collagen
► Proteoglycans
►Fibronectin
► Integrins
11) What are intercellular junctions and why are they important?
12) Contrast plasmodesmata, tight junctions, desmosomes, and gap junctions.
► Plasmodesmata:
► Tight junctions:
► Desmosomes:
► Gap Junctions: