21391301
Descripción
Test por Rachael Martin, actualizado hace más de 1 año
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Creado por Rachael Martin
hace alrededor de 4 años
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Pregunta 1
Pregunta
In which part of the body is the most water found?
Respuesta
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Plasma
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Interstitial fluid
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Minor components
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Intracellular fluids
Pregunta 2
Pregunta
The four main cations in cells are [blank_start]Na+, K+, Ca++ and Mg++[blank_end]
Respuesta
-
Na+, K+, Ca++ and Mg++
Pregunta 3
Pregunta
The major intracellular cation is
Respuesta
-
Na+
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K+
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Ca++
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Mg++
Pregunta 4
Pregunta
The [blank_start]cell membrane[blank_end] defines a cell, and acts as a continuous barrier between the inside and outside, allowing for the creation of an internal environment
Respuesta
-
cell membrane
Pregunta 5
Pregunta
Which organelles are vesicles containing enzymes for the breakdown of material?
Respuesta
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Mitochondria
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Golgi apparatus
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Lysosomes
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Nucleoli
Pregunta 6
Pregunta
What is the purpose of the rough endoplasmic reticulum (RER) being continuous with the outer nuclear membrane?
Respuesta
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As the RER produces proteins from the instructions of the nucleus, this allows fast movement between the two organelles
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To create a larger surface area to volume ratio
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As the RER produces proteins from the instructions of the nucleus, this allows for the RER to create extra messages for other organelles to produce proteins
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To create a larger concentration gradient for the flow of proteins
Pregunta 7
Pregunta
Specialised junctions called [blank_start]desmosomes[blank_end] link adjacent cells without sealing them into a sheet, giving them some degree of flexibility and being able to withstand stress
Respuesta
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desmosomes
Pregunta 8
Pregunta
The lipids of the cell membranes contain two [blank_start]non-polar[blank_end] fatty acid chains stuck together by a [blank_start]polar[blank_end] head group
Respuesta
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non-polar
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polar
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non-polar
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polar
Pregunta 9
Pregunta
Which component of the membrane regulates fluidity?
Respuesta
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amphipathic
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lipid micelles
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cholesterol
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potassium
Pregunta 10
Pregunta
Which proteins are not inserted into the membrane but rather associate with the membrane itself or another membrane protein?
Respuesta
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integral transmembrane proteins
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peripheral membrane-associated proteins
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integral outer membrane proteins
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integral inner membrane proteins
Pregunta 11
Pregunta
Integral proteins [blank_start]cannot[blank_end] be removed from the membrane without ripping it apart
Respuesta
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cannot
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can
Pregunta 12
Pregunta
Which of the following increases the permeability of the membrane?
Respuesta
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membrane kinks
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low temperature
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high cholesterol
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saturated fatty acids
Pregunta 13
Pregunta
The cell membrane is selectively permeable as it allows [blank_start]only some substances[blank_end] to pass freely
Respuesta
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only some substances
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all substances
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most substances
Pregunta 14
Pregunta
The advantages of a selectively permeable cell membrane include (more than one correct answer):
Respuesta
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permits an internal environment
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facilitates chemical reactions
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allows uptake of toxic chemicals
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allows development of electrical potential
Pregunta 15
Pregunta
Which of the following is a characteristic of passive transport?
Respuesta
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requires use of ATP
-
requires a concentration or electro-chemical gradient
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must use membrane proteins
-
requires high temperatures
Pregunta 16
Pregunta
[blank_start]Diffusion[blank_end] is the passive [blank_start]net[blank_end] movement of molecules from one location to another, through thermal agitation
Respuesta
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Diffusion
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net
Pregunta 17
Pregunta
Diffusion reaches equilibrium over time, and at equilibrium, there is [blank_start]no net flux[blank_end]
Respuesta
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no net flux
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high flux
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no flux
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high net flux
Pregunta 18
Pregunta
Which of the following is NOT a factor influencing the rate of simple diffusion?
Respuesta
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concentration gradient
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distance
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viscosity
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saturation
Pregunta 19
Pregunta
Fick's law equation in words is net flux = [blank_start]permeability constant*surface area*[blank_end](concentration gradient)
Respuesta
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permeability constant*surface area*
Pregunta 20
Pregunta
Which two properties of molecules control their ability to permeate a cell membrane?
Respuesta
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molecular mass
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lipid solubility
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temperature
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surface area
Pregunta 21
Pregunta
Which of the following best defines facilitated diffusion?
Respuesta
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The net movement of substances down their concentration gradient via specific transmembrane proteins
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The net movement of substances down their concentration gradient
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The transport of ions through ATP powered ion pumps
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The transport of substances against their concentration gradient through use of transmembrane proteins and ATP
Pregunta 22
Pregunta
To transport a molecule via facilitated diffusion, the carrier protein has to bind to it, and only molecules with the appropriate part can fit into the specific binding site and thus be transported; this is known as [blank_start]specificity[blank_end]
Respuesta
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specificity
Pregunta 23
Pregunta
Which of the following is NOT a class of direct or primary active transport mechanisms?
Respuesta
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Ion pumps
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ABC system
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Group translocation
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Antiports
Pregunta 24
Pregunta
P-class ion pumps are made of [blank_start]a single protein[blank_end] with [blank_start]4[blank_end] trans-membrane subunits
Respuesta
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a single protein
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two proteins
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4
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2
Pregunta 25
Pregunta
Secondary/coupled active transport involves the accumulating of amino acids and sugars in transport processes which are driven by [blank_start]ion[blank_end] gradients
Respuesta
-
ion
Pregunta 26
Pregunta
The difference between active and passive transport is that active transport [blank_start]expends[blank_end] energy (usually in the form of [blank_start]ATP[blank_end])
Respuesta
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expends
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produces
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ATP
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ADP
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Light
Pregunta 27
Pregunta
Which of the following regarding membrane proteins is correct?
Respuesta
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Integral membrane proteins are amphipathic
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Peripheral membrane proteins may span the entire membrane
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Both peripheral and integral membrane proteins may be able to move laterally in the membrane
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Integral membrane proteins may help confer cell shape and motility
Pregunta 28
Pregunta
One striking feature of plasma membrane structure is its symmetry, with the extracellular and cytoplasmic surfaces virtual mirror images of each other
Respuesta
- True
- False
Pregunta 29
Pregunta
One function of integral membrane proteins in the plasma membrane of cells is to form channels to allow passage of nonpolar solutes into the cell
Respuesta
- True
- False
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