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Quiz von isabela.merelles, aktualisiert more than 1 year ago
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Erstellt von isabela.merelles
vor etwa 8 Jahre
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Frage 1
Frage
Which of the major types of membrane proteins are bound to the surface of the membrane?
Antworten
-
Integral proteins.
-
Carrier proteins.
-
Peripheral proteins.
-
Channel proteins.
-
Receptor proteins.
Frage 2
Frage
Systems that have energy added to them or energy removed from them are best described as which one of the following:
Antworten
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Open systems.
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Closed systems.
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Energy depositing systems.
-
Energy releasing systems.
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None of the above.
Frage 3
Frage
Which of the following dictate the size and shape of erythrocytes?
Antworten
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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.
Frage 4
Frage
Why does the composition of extracellular fluid differ from that of intracellular fluids?
Antworten
-
Because ions are unable to cross the plasma membrane
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Because the plasma membrane is freely permeable to all molecules.
-
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.
Frage 5
Frage
Phospholipids can move within the plane of the membrane. Which of the following type of movement rarely occurs?
Antworten
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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.
-
All the above
Frage 6
Frage
Oxidation and reduction occur simultaneously
Antworten
- True
- False
Frage 7
Frage
What are Photoautotrophos?
Antworten
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Organisms that use light energy to synthesise organic molecules from CO2
-
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
Frage 8
Frage
Some enzyme-catalyzed reactions cease completely if their enzyme is absent
Antworten
- True
- False
Frage 9
Frage
The rule that oxidation release energy, whereas reductions require energy input, applies to all chemical reactions, not just those that occur in living cells.
Antworten
- True
- False
Frage 10
Frage
Some cells adjust their membrane [blank_start]fluidity[blank_end] by modifying the lipid composition of their membranes
Antworten
-
fluidity
Frage 11
Frage
The value of ΔH for a reaction is positive, therefore that reaction is catabolic.
Antworten
- True
- False
Frage 12
Frage
Which of the following properties causes phospholipid molecules to form self-sealing, membrane bilayers when placed in water?
Antworten
-
Phospholipid molecules are hydrocarbons
-
Phospholipid molecules are hydrophylic
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Phospholipid molecules are hydrophobic
-
Phospholipid molecules are amphipathic
-
Phospholipid molecules are bipolar
Frage 13
Frage
Who pioneered the microscope?
Antworten
-
Matthias Scheldien
-
Theodor Schawann
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Anton van Leeuwenhoek
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Rudolf Virchopw
-
Robert Hooke
Frage 14
Frage
Which option below is a type of prokaryote morphology?
Antworten
-
Cocci (spherical)
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Bacillus (rods/rod-like)
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Spirochetes (spiral)
-
Vibrio ("commas"/curved rods)
-
All the above
Frage 15
Frage
Which of the following statements is incorrect?
Antworten
-
Nuclei and mitochondria are surrounded by a double membrane
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Hereditary information of a cell is passed on by its proteins
-
Lysosomes and peroxisomes are the site of degradation of unwanted material
-
Bacterial DNA is found in the cystosol
Frage 16
Frage
In the cytoskeleton, microtubules are composed of which of the following subunits?
Antworten
-
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
Frage 17
Frage
Which of the following terms applies to cell-cell communication between adjacent cells and is dependent on physical cell-cell contact?
Antworten
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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
Frage 18
Frage
What technique below is not used to visualise the cytoskeleton?
Antworten
-
Fluorescence microscopy
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Live cell fluorescence microcospy
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Computer-enhanced digital videaomucroscopy
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Light microscopy
-
Electron microscopy
Frage 19
Frage
Which of the following membrane proteins penetrate the hydrophobic interior of
the lipid bilayer?
Antworten
-
Integral proteins
-
Peripheral proteins
-
Channel proteins
-
Carrier proteins
-
Receptor proteins
Frage 20
Frage
When G < 0, the reaction is exergonic. Which of the following statements is
correct in relation to such reactions?
Antworten
-
They can proceed forward and can occur spontaneously
-
They cannot occur spontaneously
-
They measure the thermodynamic spontaneity
-
They need energy to proceed
-
None of the above
Frage 21
Frage
Which one of the following statements is correct in relation to enzyme inhibition?
Antworten
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Enzyme inhibition is always irreversible
-
Reversible inhibition can be competitive and non-competitive
-
Enzyme inhibitors cannot be used as therapeutic agents
-
In non- competitive inhibition, the inhibitor competes with the substrate for the same binding site on the enzyme
-
None of the above
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