Question 1 of 8cell membranes
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The diagram shows the fluid mosaic model of a membrane.
Where in an animal cell is alcohol detoxified?
Which of the following groups of structures would be clearly seen in a well stained onion epidermal cell under the light microscope at ×400 magnification?
What property of phospholipids makes them ideal in membrane architecture?
A fresh leaf was homogenised and the suspension subjected to differential centrifugation. The procedure is shown in the flow chart below.
The diagrams show cells obtained from different organs.
What is the function of glycoproteins in cell membranes?
A secretory cell was supplied with radioactively labelled amino acids.
In a cell surface membrane, water-soluble (polar) substances cannot diffuse freely across the lipid bilayer. Which part of the membrane structure is mainly responsible for restricting this movement?
Fig 1.1 shows the structure of the cell membrane, with structures labelled A, B and C. What is the name of the molecule labelled A, which forms the bilayer that makes up the basic framework of the membrane?
Fig. 1.1 is a diagram of a typical mammalian cell. The structure labelled A is the
In Fig. 1.1, A labels the stack of flattened membrane sacs that chemically modifies and packages the proteins made by the cell. Name this organelle.
An organelle of an animal cell, seen under the electron microscope, is bounded by two membranes and its inner membrane is folded inwards into cristae. This organelle is
Endocytosis differs from osmosis in that endocytosis
Name the type of transport in which the cell surface membrane invaginates and pinches off to form a vesicle enclosing extracellular material.
Osmosis is the net movement of water molecules from a region of
At high temperature, cholesterol in a cell surface membrane
Which correctly distinguishes a lysosome from a ribosome?
Besides glycerol, name the two components that make up a phospholipid molecule.
A phospholipid molecule is described as amphipathic because it has
In an aqueous environment, phospholipids spontaneously form a bilayer with
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