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ap bio test

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chapter 6 and 7 test

Questão 1 de 16

1

Which solution has the highest concentration of particles?

Selecione uma das seguintes:

  • 1 M calcium chloride

  • 1 M sucrose

  • 1.5 M glucose

  • 0.5 M sodium chloride

Explicação

Questão 2 de 16

1

The solution with the highest water potential is

Selecione uma das seguintes:

  • 0.1 M sucrose

  • 0.4 M sucrose

  • 0.2 M sucrose

  • 0.6 M sucrose

Explicação

Questão 3 de 16

1

glucose diffuses slowly through artificial phospholipid bilayers called?

Selecione uma das seguintes:

  • simple diffusion

  • phagocytosis

  • active transport protein

  • facilitated diffusion

Explicação

Questão 4 de 16

1

The presence of cholesterol in the plasma membrane of some animals

Selecione uma das seguintes:

  • 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

Explicação

Questão 5 de 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?

Selecione uma das seguintes:

  • 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

Explicação

Questão 6 de 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?

Selecione uma das seguintes:

  • ribosomes, nucleus, mitocondria

  • chloroplasts, ribosomes, vacuoles

  • nucleus, ribosomes, chloroplasts

  • vacuoles, ribosomes, nucleus

  • nucleus, mitocondria, ribosomes

Explicação

Questão 7 de 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

Selecione uma das seguintes:

  • 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

Explicação

Questão 8 de 16

1

A primary objective of cell fractionation is to

Selecione uma das seguintes:

  • 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

Explicação

Questão 9 de 16

1

The advantage of light microscopy over electron microscopy is that

Selecione uma das seguintes:

  • 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

Explicação

Questão 10 de 16

1

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

Selecione uma das seguintes:

  • a light microscope

  • a scanning electron microscope

  • a transmission electron microscope

  • A and B

  • B and C

Explicação

Questão 11 de 16

1

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

Selecione uma das seguintes:

  • large and hydrophobic

  • large polar

  • small and hydrophobic

  • ionic

Explicação

Questão 12 de 16

1

Water passes quickly through cell membranes because

Selecione uma das seguintes:

  • the bilayer is hydrophilic

  • it is a small, polar, charged molecule

  • it moves through hydrophobic channels

  • it moves through aquaporins in the membrane

Explicação

Questão 13 de 16

1

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

Selecione uma das seguintes:

  • gap junctions

  • hydrophilic proteins

  • aquaporins

  • carbohydrates

Explicação

Questão 14 de 16

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 15 de 16

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 16 de 16

1

water diffuses through

Selecione uma das seguintes:

  • facilitated diffusion protein

  • aquaporins

  • active transport proteins

  • two answers are correct

Explicação