Test
PHY2011 - topic 1 and 2
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Preguntas del test (29)
1In which part of the body is the most water found?
- APlasma
- BInterstitial fluid
- CMinor components
- DIntracellular fluids
2The four main cations in cells are [blank_start]Na+, K+, Ca++ and Mg++[blank_end]
- ANa+, K+, Ca++ and Mg++
3The major intracellular cation is
- ANa+
- BK+
- CCa++
- DMg++
4The [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
- Acell membrane
5Which organelles are vesicles containing enzymes for the breakdown of material?
- AMitochondria
- BGolgi apparatus
- CLysosomes
- DNucleoli
6What is the purpose of the rough endoplasmic reticulum (RER) being continuous with the outer nuclear membrane?
- AAs the RER produces proteins from the instructions of the nucleus, this allows fast movement between the two organelles
- BTo create a larger surface area to volume ratio
- CAs 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
- DTo create a larger concentration gradient for the flow of proteins
7Specialised 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
- Adesmosomes
8The 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
- Anon-polar
- Bpolar
- Cnon-polar
- Dpolar
9Which component of the membrane regulates fluidity?
- Aamphipathic
- Blipid micelles
- Ccholesterol
- Dpotassium
10Which proteins are not inserted into the membrane but rather associate with the membrane itself or another membrane protein?
- Aintegral transmembrane proteins
- Bperipheral membrane-associated proteins
- Cintegral outer membrane proteins
- Dintegral inner membrane proteins
11Integral proteins [blank_start]cannot[blank_end] be removed from the membrane without ripping it apart
- Acannot
- Bcan
12Which of the following increases the permeability of the membrane?
- Amembrane kinks
- Blow temperature
- Chigh cholesterol
- Dsaturated fatty acids
13The cell membrane is selectively permeable as it allows [blank_start]only some substances[blank_end] to pass freely
- Aonly some substances
- Ball substances
- Cmost substances
14The advantages of a selectively permeable cell membrane include (more than one correct answer):
- Apermits an internal environment
- Bfacilitates chemical reactions
- Callows uptake of toxic chemicals
- Dallows development of electrical potential
15Which of the following is a characteristic of passive transport?
- Arequires use of ATP
- Brequires a concentration or electro-chemical gradient
- Cmust use membrane proteins
- Drequires high temperatures
16[blank_start]Diffusion[blank_end] is the passive [blank_start]net[blank_end] movement of molecules from one location to another, through thermal agitation
- ADiffusion
- Bnet
17Diffusion reaches equilibrium over time, and at equilibrium, there is [blank_start]no net flux[blank_end]
- Ano net flux
- Bhigh flux
- Cno flux
- Dhigh net flux
18Which of the following is NOT a factor influencing the rate of simple diffusion?
- Aconcentration gradient
- Bdistance
- Cviscosity
- Dsaturation
19Fick's law equation in words is net flux = [blank_start]permeability constant*surface area*[blank_end](concentration gradient)
- Apermeability constant*surface area*
20Which two properties of molecules control their ability to permeate a cell membrane?
- Amolecular mass
- Blipid solubility
- Ctemperature
- Dsurface area
21Which of the following best defines facilitated diffusion?
- AThe net movement of substances down their concentration gradient via specific transmembrane proteins
- BThe net movement of substances down their concentration gradient
- CThe transport of ions through ATP powered ion pumps
- DThe transport of substances against their concentration gradient through use of transmembrane proteins and ATP
22To 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]
- Aspecificity
23Which of the following is NOT a class of direct or primary active transport mechanisms?
- AIon pumps
- BABC system
- CGroup translocation
- DAntiports
24P-class ion pumps are made of [blank_start]a single protein[blank_end] with [blank_start]4[blank_end] trans-membrane subunits
- Aa single protein
- Btwo proteins
- C4
- D2
25Secondary/coupled active transport involves the accumulating of amino acids and sugars in transport processes which are driven by [blank_start]ion[blank_end] gradients
- Aion
26The 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])
- Aexpends
- Bproduces
- CATP
- DADP
- ELight
27Which of the following regarding membrane proteins is correct?
- AIntegral membrane proteins are amphipathic
- BPeripheral membrane proteins may span the entire membrane
- CBoth peripheral and integral membrane proteins may be able to move laterally in the membrane
- DIntegral membrane proteins may help confer cell shape and motility
28One striking feature of plasma membrane structure is its symmetry, with the extracellular and cytoplasmic surfaces virtual mirror images of each other
- AVerdadero
- BFalso
29One function of integral membrane proteins in the plasma membrane of cells is to form channels to allow passage of nonpolar solutes into the cell
- AVerdadero
- BFalso
Información
- Descripción
- topic 1 and 2 for phy2011
- Autor
- Rachael Martin
- Idioma
- English
- Visitas
- 94
- Etiquetas
- Valoración
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