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Biological Membranes quiz #2

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  • Which molecule is not part of the plasma membrane?
    RNA
  • What is not a characteristic of the plasma membrane?
    Rigid and static
  • Which membrane is gelatinous? A) Plasma membrane B) Nuclear envelope C) Cytoplasmic membrane D) Glycocalyx
    D) Glycocalyx
  • What is the relationship between steroid hormones and cell membranes?
    Steroid hormones can pass through cell membranes due to their lipid-soluble nature.
  • Which components form the structure of the plasma membrane? A) Phospholipids, proteins, and cholesterol B) DNA, RNA, and proteins C) Carbohydrates, nucleic acids, and lipids D) Proteins, nucleic acids, and carbohydrates
    A) Phospholipids, proteins, and cholesterol
  • Which is present in the nuclear membrane (envelope) that is not present in the cell membrane? A) Nuclear pores B) Cholesterol C) Glycoproteins D) Phospholipids
    A) Nuclear pores
  • What is the major component of the plasma membrane?
    C) Phospholipids
  • What would happen to the plasma membrane without cholesterol?
    Without cholesterol, the plasma membrane would become less fluid and more susceptible to temperature changes.
  • What is the function of cholesterol in the membrane?
    Cholesterol helps to stabilize the membrane and maintain its fluidity.
  • What is the fluid mosaic model, and how does it describe the structure and behavior of biological membranes?
    The fluid mosaic model describes biological membranes as dynamic structures composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. The 'fluid' aspect refers to the ability of these molecules to move laterally within the membrane, while the 'mosaic' aspect highlights the diverse components that make up the membrane. This model emphasizes that the membrane is not rigid but flexible and constantly changing.