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- In what situation(s) would a transmission electron microscope be ideal, and why?Figure 13.6 Which of the following statements is true? a. Gram-positive bacteria have a single cell wall formed from peptidoglycan. b. Gram-positive bacteria have an outer membrane. c. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin. d. Gram-negative bacteria have a cell wall made of peptidoglycan, while Gram-positive bacteria have a cell wall made of phospholipids.What type of micrograph is shown below? Is the organism pictured prokaryotic or eukaryotic? How can you tell?
- Why is the relationship between surface area and volume of a cell important in determining cell size limits?In what situation(s) would the use of a scanning electron microscope be ideal, and why?Sterile normal saline is used in most surgical procedures as an irrigation solution. During certain surgical procedures, such as those for malignancy, the surgeon may request that sterile water be used for irrigation instead of saline following excision of the cancerous mass. What reaction will occur between the eukaryotic cells of the body and the water?
- In the context of cell biology, what do we mean by form follows function? What are a least two examples of this concept?Why are plasma membranes arranged as a bilayer rather than a monolayer?Rb is a negative regulator that blocks the cell cycle at the G1 checkpoint until the cell achieves a requisite size. What molecular mechanism does Rb employ to halt the cell cycle?
- Biologists have long been interested in the effects of radiation on cells. In one experiment, researchers examined the effect of radium on mitosis of chick embryo cells growing in culture. A population of experimental cells was examined under the microscope for the number of cells in telophase (as a measure of mitosis occurring) before, during, and after exposure to radium. The results are shown in the Figure. What is the effect of radium exposure on mitosis? Source: R. G. Canti and M. Donaldson. 1926. The effect of radium on mitosis in vitro. Proceedings of the Royal Society of London, Series B, Containing Papers of a Biological Character 100:413419.Sterile normal saline is used in most surgical procedures as an irrigation solution. During certain surgical procedures, such as those for malignancy, the surgeon may request that sterile water be used for irrigation instead of saline following excision of the cancerous mass. Why is normal saline usually used in healthy tissues?The cell wall is ___________ . interior to the cell membrane exterior to the cell membrane a part of the cell membrane interior or exterior depending on the particular cell
