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chapter 6 and 7 test

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ap bio test
mcarpent6140
Quiz by mcarpent6140, updated more than 1 year ago
mcarpent6140
Created by mcarpent6140 over 8 years ago
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Resource summary

Question 1

Question
Which solution has the highest concentration of particles?
Answer
  • 1 M calcium chloride
  • 1 M sucrose
  • 1.5 M glucose
  • 0.5 M sodium chloride

Question 2

Question
The solution with the highest water potential is
Answer
  • 0.1 M sucrose
  • 0.4 M sucrose
  • 0.2 M sucrose
  • 0.6 M sucrose

Question 3

Question
glucose diffuses slowly through artificial phospholipid bilayers called?
Answer
  • simple diffusion
  • phagocytosis
  • active transport protein
  • facilitated diffusion

Question 4

Question
The presence of cholesterol in the plasma membrane of some animals
Answer
  • membranes more fluid when cell temperature drops
  • allows removal of hydrogen from saturated phospholipids
  • allows addition of hydrogen to unsaturated fats
  • 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
  • the focal length of the electron microscope is significantly longer
  • contrast is enhanced by staining with atoms of heavy metal
  • electron beams have much shorter wavelengths than visible light
  • the electron microscope has much greater ratio of image size to real size
  • 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
  • ribosomes, nucleus, mitocondria
  • chloroplasts, ribosomes, vacuoles
  • nucleus, ribosomes, chloroplasts
  • vacuoles, ribosomes, nucleus
  • 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
  • the relative solubility of the component
  • the size and weight of the component
  • the percentage of carbohydrates in the component
  • the number of enzymes in the fraction
  • 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
  • identify the enzymes outside the organelles
  • determine the size of various organelles
  • separate the major organelles so that their particular functions can be determined
  • 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
  • light microscopy provides for a higher magnification than electron microscopy
  • light microscopy provides for higher resolving power than electron microscopy
  • light microscopy allows one to view dynamic processes in living cells
  • A and B
  • B and C

Question 10

Question
When biologists wish to study the internal ultrastructure of cells, they most likely would use
Answer
  • a light microscope
  • a scanning electron microscope
  • a transmission electron microscope
  • A and B
  • B and C

Question 11

Question
What kinds of molecules pass through a cell membrane most easily?
Answer
  • large and hydrophobic
  • large polar
  • small and hydrophobic
  • ionic

Question 12

Question
Water passes quickly through cell membranes because
Answer
  • the bilayer is hydrophilic
  • it is a small, polar, charged molecule
  • it moves through hydrophobic channels
  • it moves through aquaporins in the membrane

Question 13

Question
Chloride ion channels are membrane structures that include which of the following
Answer
  • gap junctions
  • hydrophilic proteins
  • aquaporins
  • carbohydrates

Question 14

Question
What would you expect to be a problem for someone with nonfunctional chloride channeling?
Answer
  • inadequate secretion of mucus in the lungs
  • buildup of excessive secretions such as the pancreas
  • buildup of excessive secretions in organs such as lungs
  • 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
  • hypertonic to fresh water but hypotonic to the salt solution
  • hypertonic to both fresh water and the salt solution
  • hypertonic to fresh water but hypertonic to the salt solution

Question 16

Question
water diffuses through
Answer
  • facilitated diffusion protein
  • aquaporins
  • active transport proteins
  • two answers are correct
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