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12 Jul 2018

7) The major function of a biological fixative is to

A. Enhance the structures in the cell for visualization

B. Keep the cell living for observation by stopping any further cellular metabolism.

C. Cross-link the proteins in the cell and maintain cell structure.

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Elin Hessel
Elin HesselLv2
14 Jul 2018

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Related questions

What electron or light microscopy technique would you use toobserve the following?

a) the fine detail of the outer surface of hair cells in theinner ear.

b) the interior and exterior of surfaces of the plasma membraneto support the Fluid-Mosaic Model of membrane structure.

c) very thin cross sections made in Epon in order to visualizethe fine structure of cellular organelles and cell architecture inthe cell interior.

d) particulate matter (like large multisubunit enzyme complexesor viruses) so as to exhibit the subunit structure. Negativestaining.

e) specifically localize a molecule like tubulin in a cell usinga light microscope.

f) the highly organized structure at the molecular level of thespindle of a dividing cell using the lightmicroscope.

g) technique using lasers to optically section large specimens;the images may be computer-enhanced.

h) living cells without killing them by adding stain.

i) a three-dimensional view (almost bas-relief view)of chromosomes in a dividing cell.

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1. What are the structural and functional units of a living organism? 1. What are the structural and functional units of a living organism? 2. What is the role of the cell membrane? 3. What is the cell membrane made of? 4. What does phospholipid bi-layer mean? 5. What are some functions of membrane proteins? 6. What are the two major groups of cell membrane proteins? How are they different? 7. Describe diffusion. 8. What does selectively permeable mean? 9. Does diffusion require energy from the cell? 10. What might restrict the movement of a molecule across a cell membrane? 11. In the video what are channel proteins are compared to? 12. What does gated channel mean? 13. Explain osmosis. 14. Explain isotonic. 15. Explain hypotonic. 16. Explain lysis of a cell. 17. Explain hypertonic. 18. How is facilitated diffusion different than regular diffusion? 19. Define active transport. 20. What does the sodium / potassium pump do for the cell?

21- All living things have 1 of 2 possible cell types. What are these two cell types and how is one type

distinguished from the other. Living organisms can be classified into 3 domains. What are the 3 domains.

22. Be familiar with the terms that describe the shape and arrangement of bacteria.

23. Be familiar with bacterial cell structure and function, including the external components of the cell, the

cell wall, the cell membrane, and internal structures.

24. What distinguishes a Gram-positive bacterium from a Gram-negative bacterium.

25. Microbial growth.

a. What are the physical requirements for growth.

b. What are the chemical requirements for growth.

c. How can bacteria be classified based on their oxygen requirements, temperature preferences, and pH preferences.

d. Bacterial cells divide by a process called binary fission.

e. What are the 4 phases of a typical bacterial growth curve.How does one measure bacterial growth.

26. Metabolism

a. catabolism versus anabolism

b. What are enzymes and how do they work.

c. What is an oxidation and what is a reduction.

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