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ap bio test

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chapter 6 and 7 test

chapter 6 and 7 test

Question 1 of 16

1

Which solution has the highest concentration of particles?

Select one of the following:

  • 1 M calcium chloride

  • 1 M sucrose

  • 1.5 M glucose

  • 0.5 M sodium chloride

Explanation

Question 2 of 16

1

The solution with the highest water potential is

Select one of the following:

  • 0.1 M sucrose

  • 0.4 M sucrose

  • 0.2 M sucrose

  • 0.6 M sucrose

Explanation

Question 3 of 16

1

glucose diffuses slowly through artificial phospholipid bilayers called?

Select one of the following:

  • simple diffusion

  • phagocytosis

  • active transport protein

  • facilitated diffusion

Explanation

Question 4 of 16

1

The presence of cholesterol in the plasma membrane of some animals

Select one of the following:

  • 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

Explanation

Question 5 of 16

1

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?

Select one of the following:

  • 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

Explanation

Question 6 of 16

1

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?

Select one of the following:

  • ribosomes, nucleus, mitocondria

  • chloroplasts, ribosomes, vacuoles

  • nucleus, ribosomes, chloroplasts

  • vacuoles, ribosomes, nucleus

  • nucleus, mitocondria, ribosomes

Explanation

Question 7 of 16

1

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

Select one of the following:

  • 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

Explanation

Question 8 of 16

1

A primary objective of cell fractionation is to

Select one of the following:

  • 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

Explanation

Question 9 of 16

1

The advantage of light microscopy over electron microscopy is that

Select one of the following:

  • 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

Explanation

Question 10 of 16

1

When biologists wish to study the internal ultrastructure of cells, they most likely would use

Select one of the following:

  • a light microscope

  • a scanning electron microscope

  • a transmission electron microscope

  • A and B

  • B and C

Explanation

Question 11 of 16

1

What kinds of molecules pass through a cell membrane most easily?

Select one of the following:

  • large and hydrophobic

  • large polar

  • small and hydrophobic

  • ionic

Explanation

Question 12 of 16

1

Water passes quickly through cell membranes because

Select one of the following:

  • the bilayer is hydrophilic

  • it is a small, polar, charged molecule

  • it moves through hydrophobic channels

  • it moves through aquaporins in the membrane

Explanation

Question 13 of 16

1

Chloride ion channels are membrane structures that include which of the following

Select one of the following:

  • gap junctions

  • hydrophilic proteins

  • aquaporins

  • carbohydrates

Explanation

Question 14 of 16

1

What would you expect to be a problem for someone with nonfunctional chloride channeling?

Select one of the following:

  • 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

Explanation

Question 15 of 16

1

celery stalks that are immersed in fresh water for several hours become stiff and hard thus...

Select one of the following:

  • 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

Explanation

Question 16 of 16

1

water diffuses through

Select one of the following:

  • facilitated diffusion protein

  • aquaporins

  • active transport proteins

  • two answers are correct

Explanation

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