5123580
Descripción
Test por isabela.merelles, actualizado hace más de 1 año
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Creado por isabela.merelles
hace más de 8 años
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Pregunta 1
Pregunta
Which of the major types of membrane proteins are bound to the surface of the membrane?
Respuesta
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Integral proteins.
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Carrier proteins.
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Peripheral proteins.
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Channel proteins.
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Receptor proteins.
Pregunta 2
Pregunta
Systems that have energy added to them or energy removed from them are best described as which one of the following:
Respuesta
-
Open systems.
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Closed systems.
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Energy depositing systems.
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Energy releasing systems.
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None of the above.
Pregunta 3
Pregunta
Which of the following dictate the size and shape of erythrocytes?
Respuesta
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Interactions with other cells in the vascular system.
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The biological functions / roles of those erythrocytes
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The intracellular content of those erythrocytes.
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The size and shape of the parent (stem) cells from which those erythrocytes arise.
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The size of the vascular system around which those cells must circulate.
Pregunta 4
Pregunta
Why does the composition of extracellular fluid differ from that of intracellular fluids?
Respuesta
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Because ions are unable to cross the plasma membrane
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Because the plasma membrane is freely permeable to all molecules.
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Because the plasma membrane is impermeable to water.
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Because the plasma membrane offers an impermeable barrier to all solutes.
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Because the plasma membrane is selectively permeable to particular solutes.
Pregunta 5
Pregunta
Phospholipids can move within the plane of the membrane. Which of the following type of movement rarely occurs?
Respuesta
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Lateral Diffusion (Exchanging places with a molecule within the same monolayer).
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Rotation along their axis.
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Flip-flop (Exchanging places with lipids in the other monolayer of a bilayer).
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Flexion.
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All the above
Pregunta 6
Pregunta
Oxidation and reduction occur simultaneously
Respuesta
- True
- False
Pregunta 7
Pregunta
What are Photoautotrophos?
Respuesta
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Organisms that use light energy to synthesise organic molecules from CO2
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Organisms which use energy from photons of light
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Organisms that useenergy from light energy and organic substrate
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Organisms which use energy derived from chemical bonds
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All the above
Pregunta 8
Pregunta
Some enzyme-catalyzed reactions cease completely if their enzyme is absent
Respuesta
- True
- False
Pregunta 9
Pregunta
The rule that oxidation release energy, whereas reductions require energy input, applies to all chemical reactions, not just those that occur in living cells.
Respuesta
- True
- False
Pregunta 10
Pregunta
Some cells adjust their membrane [blank_start]fluidity[blank_end] by modifying the lipid composition of their membranes
Respuesta
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fluidity
Pregunta 11
Pregunta
The value of ΔH for a reaction is positive, therefore that reaction is catabolic.
Respuesta
- True
- False
Pregunta 12
Pregunta
Which of the following properties causes phospholipid molecules to form self-sealing, membrane bilayers when placed in water?
Respuesta
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Phospholipid molecules are hydrocarbons
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Phospholipid molecules are hydrophylic
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Phospholipid molecules are hydrophobic
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Phospholipid molecules are amphipathic
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Phospholipid molecules are bipolar
Pregunta 13
Pregunta
Who pioneered the microscope?
Respuesta
-
Matthias Scheldien
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Theodor Schawann
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Anton van Leeuwenhoek
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Rudolf Virchopw
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Robert Hooke
Pregunta 14
Pregunta
Which option below is a type of prokaryote morphology?
Respuesta
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Cocci (spherical)
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Bacillus (rods/rod-like)
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Spirochetes (spiral)
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Vibrio ("commas"/curved rods)
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All the above
Pregunta 15
Pregunta
Which of the following statements is incorrect?
Respuesta
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Nuclei and mitochondria are surrounded by a double membrane
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Hereditary information of a cell is passed on by its proteins
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Lysosomes and peroxisomes are the site of degradation of unwanted material
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Bacterial DNA is found in the cystosol
Pregunta 16
Pregunta
In the cytoskeleton, microtubules are composed of which of the following subunits?
Respuesta
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Motor proteins
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Alpha tubulin and beta tubulin
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Kinesin
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Dynein
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Oligomers
Pregunta 17
Pregunta
Which of the following terms applies to cell-cell communication between adjacent cells and is dependent on physical cell-cell contact?
Respuesta
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Autocrine
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Endocrine
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Intracrine
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Juxtacrine
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Paracrine
Pregunta 18
Pregunta
What technique below is not used to visualise the cytoskeleton?
Respuesta
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Fluorescence microscopy
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Live cell fluorescence microcospy
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Computer-enhanced digital videaomucroscopy
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Light microscopy
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Electron microscopy
Pregunta 19
Pregunta
Which of the following membrane proteins penetrate the hydrophobic interior of
the lipid bilayer?
Respuesta
-
Integral proteins
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Peripheral proteins
-
Channel proteins
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Carrier proteins
-
Receptor proteins
Pregunta 20
Pregunta
When G < 0, the reaction is exergonic. Which of the following statements is
correct in relation to such reactions?
Respuesta
-
They can proceed forward and can occur spontaneously
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They cannot occur spontaneously
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They measure the thermodynamic spontaneity
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They need energy to proceed
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None of the above
Pregunta 21
Pregunta
Which one of the following statements is correct in relation to enzyme inhibition?
Respuesta
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Enzyme inhibition is always irreversible
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Reversible inhibition can be competitive and non-competitive
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Enzyme inhibitors cannot be used as therapeutic agents
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In non- competitive inhibition, the inhibitor competes with the substrate for the same binding site on the enzyme
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None of the above
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