3972770
Descripción
Test por mcarpent6140, actualizado hace más de 1 año
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Creado por mcarpent6140
hace casi 11 años
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Pregunta 1
Pregunta
Which solution has the highest concentration of particles?
Respuesta
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1 M calcium chloride
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1 M sucrose
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1.5 M glucose
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0.5 M sodium chloride
Pregunta 2
Pregunta
The solution with the highest water potential is
Respuesta
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0.1 M sucrose
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0.4 M sucrose
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0.2 M sucrose
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0.6 M sucrose
Pregunta 3
Pregunta
glucose diffuses slowly through artificial phospholipid bilayers called?
Respuesta
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simple diffusion
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phagocytosis
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active transport protein
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facilitated diffusion
Pregunta 4
Pregunta
The presence of cholesterol in the plasma membrane of some animals
Respuesta
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membranes more fluid when cell temperature drops
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allows removal of hydrogen from saturated phospholipids
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allows addition of hydrogen to unsaturated fats
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membranes are flexible thus it can sustain greater
Pregunta 5
Pregunta
If a modern electron microscope (TEM) can resolve biological images to the nanometer level as opposed to the best light microscope this is due to which of the following?
Respuesta
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the focal length of the electron microscope is significantly longer
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contrast is enhanced by staining with atoms of heavy metal
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electron beams have much shorter wavelengths than visible light
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the electron microscope has much greater ratio of image size to real size
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the electron microscope cannot image whole cells at one time
Pregunta 6
Pregunta
Which of the following correctly lists the order in which cellular components will be found in the pellet when homogenized cells are treated with increasingly rapid spins in a centrifuge?
Respuesta
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ribosomes, nucleus, mitocondria
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chloroplasts, ribosomes, vacuoles
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nucleus, ribosomes, chloroplasts
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vacuoles, ribosomes, nucleus
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nucleus, mitocondria, ribosomes
Pregunta 7
Pregunta
In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is
Respuesta
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the relative solubility of the component
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the size and weight of the component
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the percentage of carbohydrates in the component
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the number of enzymes in the fraction
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the presence or absence of lipids in the component
Pregunta 8
Pregunta
A primary objective of cell fractionation is to
Respuesta
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view the structure of cell membranes
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identify the enzymes outside the organelles
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determine the size of various organelles
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separate the major organelles so that their particular functions can be determined
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crack the cell wall so the cytoplasm contents can be released
Pregunta 9
Pregunta
The advantage of light microscopy over electron microscopy is that
Respuesta
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light microscopy provides for a higher magnification than electron microscopy
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light microscopy provides for higher resolving power than electron microscopy
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light microscopy allows one to view dynamic processes in living cells
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A and B
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B and C
Pregunta 10
Pregunta
When biologists wish to study the internal ultrastructure of cells, they most likely would use
Respuesta
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a light microscope
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a scanning electron microscope
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a transmission electron microscope
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A and B
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B and C
Pregunta 11
Pregunta
What kinds of molecules pass through a cell membrane most easily?
Respuesta
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large and hydrophobic
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large polar
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small and hydrophobic
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ionic
Pregunta 12
Pregunta
Water passes quickly through cell membranes because
Respuesta
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the bilayer is hydrophilic
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it is a small, polar, charged molecule
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it moves through hydrophobic channels
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it moves through aquaporins in the membrane
Pregunta 13
Pregunta
Chloride ion channels are membrane structures that include which of the following
Respuesta
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gap junctions
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hydrophilic proteins
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aquaporins
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carbohydrates
Pregunta 14
Pregunta
What would you expect to be a problem for someone with nonfunctional chloride channeling?
Respuesta
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inadequate secretion of mucus in the lungs
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buildup of excessive secretions such as the pancreas
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buildup of excessive secretions in organs such as lungs
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sweet that includes no mucus
Pregunta 15
Pregunta
celery stalks that are immersed in fresh water for several hours become stiff and hard thus...
Respuesta
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hypotonic to both fresh water and the salt solution
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hypertonic to fresh water but hypotonic to the salt solution
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hypertonic to both fresh water and the salt solution
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hypertonic to fresh water but hypertonic to the salt solution
Pregunta 16
Pregunta
water diffuses through
Respuesta
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facilitated diffusion protein
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aquaporins
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active transport proteins
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two answers are correct
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