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    what happens to the bacterial cells if a compound that interferes with the synthesis of the cell wall is added to an environment with low solute concentration?

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    Ch. 4 Critical Thinking Questions

    This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

    Biology for AP® Courses

    Critical Thinking Questions

    Critical Thinking Questions

    27. Which element of the cell theory has practical applications in health care because it promotes the use of sterilization and disinfection?

    All cells arise from pre-existing cells.

    All living organisms are composed of one or more cells.

    A cell is the basic unit of life.

    A nucleus and organelles are found in prokaryotic cells.

    28. What are the advantages and disadvantages of light microscopes? What are the advantages and disadvantages of electron microscopes?

    Advantage: In light microscopes, the light beam does not kill the cell. Electron microscopes are helpful in viewing intricate details of a specimen and have high resolution. Disadvantage: Light microscopes have low resolving power. Electron microscopes are costly and require killing the specimen.

    Advantage: Light microscopes have high resolution. Electron microscopes are helpful in viewing surface details of a specimen. Disadvantage: Light microscopes kill the cell. Electron microscopes are costly and low resolution.

    Advantage: Light microscopes have high resolution. Electron microscopes are helpful in viewing surface details of a specimen. Disadvantage: Light microscopes can be used only in the presence of light and are costly. Electron microscopes uses short wavelength of electrons and hence have lower magnification.

    Advantage: Light microscopes have high magnification. Electron microscopes are helpful in viewing surface details of a specimen. Disadvantage: Light microscopes can be used only in the presence of light and have lower resolution. Electron microscopes can be used only for viewing ultra-thin specimens.

    29. Mitochondria are observed in plant cells that contain chloroplasts. Why do you find mitochondria in photosynthetic tissue?

    Mitochondria are not needed but are an evolutionary relic.

    Mitochondria and chloroplasts work together to use light energy to make sugars.

    Mitochondria participate in the Calvin cycle/light independent reactions of photosynthesis.

    Mitochondria are required to break down sugars and other materials for energy.

    30. In what situation would the use of a light microscope be ideal? Why?

    A light microscope is used to view the details of the surface of a cell as it cannot be viewed in detail by the transmission microscope.

    A light microscope is used to view the growth of cells during an experiment because light does not kill the cells.

    A standard light microscope is used to view living organisms with little contrast to distinguish them from the background, which would be harder to see with the electron microscope.

    A light microscope reveals the internal structures of a cell, which cannot be viewed by transmission electron microscopy.

    31. The major role of the cell wall in bacteria is protecting the cell against changes in osmotic pressure, pressure caused by different solute concentrations in the environment. Bacterial cells swell, but do not burst, in low solute concentrations. What happens to bacterial cells if a compound that interferes with the synthesis of the cell wall is added to an environment with low solute concentrations?

    Bacterial cells will shrink due to the lack of cell wall material.

    Bacterial cells will shrink in size.

    Bacterial cells may burst due to the influx of water.

    Bacterial cells remain normal; they have alternative pathways to synthesize cell walls.

    32. What determines the upper limit of cell size?

    Pathogen defense. A very large cell is defenseless against pathogens that are present in every environment.

    Surface area-to-volume ratio. Some organisms, such as slime molds, get around this by instead of having separate cells having a branching cytoplasm with a high surface area-to-volume ratio.

    The van Der Walls forces are insufficient to hold together cell membranes of greater than 500 microns in diameter. Some organisms, such as slime molds, get around this by incorporating G proteins into the plasma membrane.

    Because of the specific gravity of water, the main component of the cytosol, a cell of greater than 500 microns in diameter will collapse in on itself in air, and a cell greater than 300 microns in diameter will collapse in on itself under water.

    33. Which of these is a possible explanation for the presence of a rigid cell wall in plants?

    Plants remain exposed to changes in temperature and thus require rigid cell walls to protect themselves.

    Plants are subjected to osmotic pressure and a cell wall helps them against bursting or shrinking.

    Plant cells have a rigid cell wall to protect themselves from grazing animals.

    Plant cells have a rigid cell wall to prevent the influx of waste material.

    34. Bacteria do not have organelles; yet, the same reactions that take place on the mitochondria inner membrane, the phosphorylation of ADP to ATP, and chloroplasts, photosynthesis, take place in bacteria. Where do these reactions take place?

    These reactions take place in the nucleoid of the bacteria.

    These reactions occur in the cytoplasm present in the bacteria.

    These reactions occur on the plasma membrane of bacteria.

    These reactions take place in the mesosomes.

    35. What are the structural and functional similarities and differences between mitochondria and chloroplasts?

    स्रोत : openstax.org

    SOLVED: The major role of the cell wall in bacteria is protecting the cell against changes in osmotic pressure, pressure caused by different solute concentrations in the environment. Bacterial cells swell, but do not burst, in low solute concentrations. What happens to bacterial cells if a compound that interferes with the synthesis of the cell wall is added to an environment with low solute concentrations? a. Bacterial cells will shrink due to the lack of cell wall material. b. Bacterial cells will shrink in size. c. Bacterial cells may burst due to the influx of water. d. Bacterial cells remain normal; they have alternative pathways to synthesize cell walls

    VIDEO ANSWER: The most important role of the cell wall is to protect the cell against changes in osmotic pressure pressure caused by different solute concentrations in the environment. We want to understand what happens to the cells when they are put

    स्रोत : www.numerade.com

    AP BIO chapter 4 moodle quiz Flashcards

    Study with Quizlet and memorize flashcards containing terms like When viewing a specimen through a light microscope, what is a method that scientists use to make it easier to see individual components of cells? a. a beam of electrons b. high temperatures c. special stains d. radioactive isotopes, What is the basic unit of life? a. cell b. organ c. tissue d. organism, Which of the following statements is part of the cell theory? a. All living organisms are made of cells. b. All cells depend on their surroundings to provide energy. c. All cells have a nucleus. d. All cells contain DNA that they pass on to daughter cells. and more.

    AP BIO chapter 4 moodle quiz

    3.0 (3 reviews) Term 1 / 33

    When viewing a specimen through a light microscope, what is a method that scientists use to make it easier to see individual components of cells?

    a. a beam of electrons

    b. high temperatures

    c. special stains

    d. radioactive isotopes

    Click the card to flip 👆

    Definition 1 / 33 c

    Click the card to flip 👆

    Created by melodyG1011

    Terms in this set (33)

    When viewing a specimen through a light microscope, what is a method that scientists use to make it easier to see individual components of cells?

    a. a beam of electrons

    b. high temperatures

    c. special stains

    d. radioactive isotopes

    c

    What is the basic unit of life?

    a. cell b. organ c. tissue d. organism a

    Which of the following statements is part of the cell theory?

    a. All living organisms are made of cells.

    b. All cells depend on their surroundings to provide energy.

    c. All cells have a nucleus.

    d. All cells contain DNA that they pass on to daughter cells.

    a

    Which of the following could most effectively be visualized with a scanning electron microscope?

    a. the movement of molecules inside the cell

    b. a three-dimensional view of the surface of a membrane

    c. details of structures inside cells

    d. cells swimming in a drop of pond water.

    b

    Which of the following observations contributed to the cell theory?

    a. Prokaryotic and eukaryotic cells are surrounded by a plasma membrane.

    b. Animal and plant cells have nuclei and organelles.

    c. Non-living material cannot give rise to living organisms.

    d. Viruses replicate.

    c

    In order to obtain some materials and remove waste, what process is used by prokaryotes?

    a. diffusion b. cell division c. flagellar motion d. ribosomes a

    What is a difference between prokaryotic and eukaryotic cells?

    a. Both cells have cytoplasm but prokaryotic cells lack a nucleus.

    b. Both cells have a nucleus but prokaryotic cells lack cytoplasm.

    c. Both cells have DNA but prokaryotic cells lack a cell membrane.

    d. Both cells have a cell membrane but prokaryotic cells lack DNA

    a

    When bacteria lack fimbriae, what are they less likely to do?

    a. retain the ability to divide

    b. Adhere to cell surfaces

    c. synthesize proteins

    d. swim through bodily fluids

    b

    Eukaryotic cells contain complex organelles that carry out their chemical reactions. Prokaryotes lack many of these complex organelles, although they have a variety of unique structures of their own. However, most prokaryotic cells can exchange nutrients with the outside environment faster than most eukaryotic cells. Why is this so?

    a.

    Most prokaryotic cells are smaller, and have a higher surface-to-volume ratio, than eukaryotic cells.

    b.

    Most prokaryotic cells are smaller, and have a lower surface-to-volume ratio than eukaryotic cells.

    c.

    Most prokaryotic cells are larger, and have a higher surface-to-volume ratio than eukaryotic cells.

    d.

    Prokaryotic cells are larger and have a lower surface-to-volume ratio than eukaryotic cells.

    a

    Which element of the cell theory has practical applications in health care because it promotes the use of sterilization and disinfection?

    a. A nucleus and organelles are found in prokaryotic cells.

    b. A cell is the basic unit of life.

    c. All cells come from pre-existing cells.

    d. All living organisms are composed of one or more cells.

    c

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