EduNinjaFig. 1.1 is an electron micrograph of part of a eukaryotic cell.
Fig. 1.1
×47000
Many of the cell structures in Fig. 1.1 are surrounded by membranes.
Membranes are approximately 6 nm to 7 nm wide.
Describe the fluid mosaic model of membrane structure.
There is space below for a diagram.
Fig. 1.1 shows five biological molecules.
Fig. 1.1
State the letter of the molecule that forms part of the cell surface membranes of eukaryotic cells.
Fig. 1.1 is an electron micrograph of a cross section through a blood vessel.
Fig. 1.1
Name:
Cell C in Fig. 1.1 is an endothelial cell.
Name structure D.
Fig. 1.1 is a diagram showing part of a cell surface membrane of an animal cell.
Fig. 1.1
State the approximate thickness of the membrane as shown by the line G-H.
Fig. 1.1 is an electron micrograph of part of a eukaryotic cell.
Fig. 1.1
The inner and outer membranes of the mitochondrion have a fluid mosaic structure similar to other cell membranes. They are both approximately 6 to 7 nanometres ( nm ) thick.
Outline the fluid mosaic model of membrane structure.
There is space below for a diagram.
Fig. 1.1 shows a diagram of part of a cell surface membrane.
Fig. 1.1
Explain how the features of molecules of A cause them to form a layer in the membrane as seen in Fig. 1.1.
The cell surface membrane has a fluid mosaic structure.
Describe what is meant by the term fluid mosaic.
In 1934, the biologists Davson and Danielli published their suggestion for the structure of the cell surface membrane, as shown in Fig. 1.1.
They suggested that the membrane was a phospholipid bilayer with a layer of hydrophilic protein on both surfaces.
Fig 1.1
State one way in which the Davson-Danielli structure is similar to the fluid mosaic structure and one way in which it differs from the fluid mosaic model.
similarity
difference
Fig. 1.1 is a diagram of a transverse section through a vein.
Fig. 1.1
Explain how the following structural features of a capillary are related to its function.
The capillary wall is composed of a single layer of squamous epithelial cells.
Fig. 1.1 is an electron micrograph of a transverse section of palisade mesophyll tissue in the leaf of the flowering plant, Zinnia elegans.
Fig. 1.1
magnification
The membrane surrounding the vacuole, called the tonoplast, has a fluid mosaic structure.
Describe the structure of this membrane.