Question 1
Question
Which solution has the highest concentration of particles?
Answer
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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
Question 2
Question
The solution with the highest water potential is
Answer
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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
Question 3
Question
glucose diffuses slowly through artificial phospholipid bilayers called?
Answer
-
simple diffusion
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phagocytosis
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active transport protein
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facilitated diffusion
Question 4
Question
The presence of cholesterol in the plasma membrane of some animals
Answer
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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
Question 5
Question
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?
Answer
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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
Question 6
Question
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?
Answer
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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
Question 7
Question
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
Answer
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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
Question 8
Question
A primary objective of cell fractionation is to
Answer
-
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
Question 9
Question
The advantage of light microscopy over electron microscopy is that
Answer
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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
Question 10
Question
When biologists wish to study the internal ultrastructure of cells, they most likely would use
Question 11
Question
What kinds of molecules pass through a cell membrane most easily?
Answer
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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
Question 12
Question
Water passes quickly through cell membranes because
Answer
-
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
Question 13
Question
Chloride ion channels are membrane structures that include which of the following
Answer
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gap junctions
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hydrophilic proteins
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aquaporins
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carbohydrates
Question 14
Question
What would you expect to be a problem for someone with nonfunctional chloride channeling?
Answer
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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
Question 15
Question
celery stalks that are immersed in fresh water for several hours become stiff and hard thus...
Answer
-
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
Question 16
Question
water diffuses through