Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 4, Problem 17TYK
The unicellular alga Chlamydomonas reinhardtii has two flagella assembled from tubulin proteins. If a researcher changes the pH from approximately neutral (their normal growing condition) to pH 4.5, Chlamydomonas cells spontaneously lose their flagella. After the cells are returned to neutral pH, they regrow the flagella—a process called reflagellation. Assuming that you have deflagellated Chlamydomonas cells, devise experiments to answer the following questions:
Do new tubulin proteins need to be made for reflagellation to occur, or is there a reservoir of proteins in the cell?
Is the production of new mRNA for the tubulin proteins necessary for reflagellation?
What is the optimal pH for reflagellation?
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The Amoeba, the paramecium, and the euglena ( These are unicellular Protozoans) produce electrical impulses that travel along their cell membrane. This is possible because they are specialized to use properties exhibited by all cells. These properties include ... A) Separation of the fluid environments inside and outside the cell B) Active transport of Na+ out of and K+ into the cell. C) Portal proteins that allow diffusion of Na+ and K+ back in to the cell D) Maintaining unequal Na+ and K+ concentrations on the two sides of the membrane. E) All of these are true
Explain why
The image below shows a density gradient centrifugation carried out to separate a mixture of lysosomes, peroxisomes and mitochondria
Organelle
mixture
60L
1.11
Centrifuge
1.15
2
1.19
1.22
1.25
Which fraction would you take to obtain mitichondria, and why?
O Fraction 2 because mitochondria contain haemoglobin. giving them a reddish colour
O Fraction 3 because it is the most dense fraction
O It is impossible to decide without further testing
O Fraction 1 because it is the least dense fraction
O Fraction 2, because mitochondria contain haem, giving them a reddish colour
Increasing density of
sucrose (g/cm³)
3.
Briefly discuss the structure of plasmodesmeta. How does it control the passage of molecules between two cells?
Chapter 4 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 4.1 - Prob. 1SBCh. 4.2 - Where in a prokaryotic cell is DNA found? How is...Ch. 4.3 - Where in a eukaryotic cell is DNA found? How is...Ch. 4.3 - Prob. 2SBCh. 4.3 - Explain the structure and function of the...Ch. 4.3 - Prob. 4SBCh. 4.3 - What is the structure and function of the...Ch. 4.4 - Prob. 1SBCh. 4.4 - Prob. 2SBCh. 4.5 - What are the structures and function of anchoring...
Ch. 4.5 - Prob. 2SBCh. 4 - A prokaryote converts food energy into the...Ch. 4 - Eukaryotic and prokaryotic ribosomes are similar...Ch. 4 - Which of the following structures does not require...Ch. 4 - Which of the following structures is not used in...Ch. 4 - Which of the following are glycoproteins whose...Ch. 4 - Prob. 6TYKCh. 4 - Which of the following statements about proteins...Ch. 4 - Which of the following is not a component of the...Ch. 4 - Discuss Concepts Explain why aliens invading Earth...Ch. 4 - You are examining a cell from a crime scene using...Ch. 4 - Prob. 11TYKCh. 4 - Prob. 12TYKCh. 4 - Prob. 13TYKCh. 4 - Prob. 14TYKCh. 4 - Prob. 15TYKCh. 4 - Prob. 16TYKCh. 4 - 17. The unicellular alga Chlamydomonas reinhardtii...Ch. 4 - Prob. 1ITD
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