Enter PgDn Del MEMBRANE STRUCTURE AND TRANSPORT ACROSS CELL MEMBRANES 1. 2. An o
ID: 302929 • Letter: E
Question
Enter PgDn Del MEMBRANE STRUCTURE AND TRANSPORT ACROSS CELL MEMBRANES 1. 2. An organelle that is characterized by extensive, folded membranes and is often associated with ribosomes Label the following diagram tside of ce Inside of cell 3. List 4 functions of the plasma membrane b. d. 4. Complete the table below with the role each component of the plasma membrane plays Role in the membrane ane components Phospholipid Bilayer Cholesterol teins Glycolipids Protein Receptor Site Protein channel Protein CarrierExplanation / Answer
1.) Endoplasmic Reticulum is an organelle with extensive, folded membranous flattened interconnected disc like structure to form a continuous network. It is often associated with ribosome and is known as rough endoplasmic reticulum.
2.) A.- Carbohydrate chain, B.- Glycoprotein, C.- Integral Protein, D.- Cholesterol, E.- Phospholipid, F.- Surface protein, G.- Hydrophilic (phosphate) head of Phospholipid, H.- Hydrophobic (lipid) tail of Phospholipid
3.) The functions of plasma membrane are as follows:
# it allows transportation of substances from the exterior environment of the cell to inside the cell and vice versa.
# it acts as a Barrier allowing selective entry of the solute.
# it provides protection as it keeps toxic substances out of the cell.
#as the membrane is selectively pearmeable facilitating diffusion
4.)
#Phospholipid bilayer- it forms the basic framework of plasma membrane and provides fluidity to the membrane. Itpreventssage of polar solute but allows passive diffusion of Hydrophobic solutes.
# Cholesterol- provides firmness to the cell membrane and prevents passage of very small molecules.
#Glycoprotein- helps in cell-cell interaction and maintains stability of the cell.
# Glycolipid- it plays main role in intercellular signaling important for immune response.
# Protein receptor site- helps in receiving signal i.e., ligand to maintain cellular activity.
# Protein channel- it allows ions to pass thorough it, as it contains narrow passage and acts as passage for them.
# Protein Carrier- it allows large molecules like amino acids to pass through it with the help of enerygy.
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