Reproduction in Single-Celled Organisms Quiz

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Questions and Answers

What is the function of mesosomes in a cell?

  • Cell growth
  • Respiration (correct)
  • Protein production
  • Genetic variation

Which organelle is the site of protein production in a cell?

  • Mesosomes
  • Mitochondria
  • Ribosomes (correct)
  • Nucleus

Why are all cells produced by mitosis genetically identical?

  • Due to cytokinesis
  • Due to genetic recombination
  • Due to replication of chromosomes (correct)
  • Due to meiosis

What is the primary function of mitosis in cell division?

<p>Producing identical daughter cells (C)</p> Signup and view all the answers

During which stage of the cell cycle do the chromosomes begin to condense?

<p>Interphase (B)</p> Signup and view all the answers

What is the main advantage of organisms using mitosis for growth?

<p>Growth using identical cells (A)</p> Signup and view all the answers

What is the process of cell division in prokaryotic cells known as?

<p>Binary Fission (C)</p> Signup and view all the answers

During binary fission, what forms between the two DNA molecules to divide the original cell?

<p>New cell wall (C)</p> Signup and view all the answers

Which component of the cell/organelle membrane controls the movement of substances in and out?

<p>Phospholipids (A)</p> Signup and view all the answers

Why do viruses not undergo cell division?

<p>They are non-living entities (D)</p> Signup and view all the answers

What gives the cell membrane its fluid mosaic model structure?

<p>Phospholipids and proteins arrangement (A)</p> Signup and view all the answers

In prokaryotic cells, what replicates alongside circular DNA during binary fission?

<p>Plasmids (D)</p> Signup and view all the answers

What type of immune response involves T cells and is responsible for destroying pathogen-infected cells?

<p>Cell-mediated response (B)</p> Signup and view all the answers

Which cells replicate themselves when exposed to an invading pathogen, leading to a faster immune response upon reinfection?

<p>Memory cells (C)</p> Signup and view all the answers

What is the main function of T killer cells in the immune response?

<p>Destroy pathogen-infected cells (A)</p> Signup and view all the answers

Which cells produce antibodies in the humoral response?

<p>Plasma cells (D)</p> Signup and view all the answers

What is the Y-shaped structure formed by antibodies made of?

<p>Four polypeptide chains (A)</p> Signup and view all the answers

Which type of immunity results from the introduction of antibodies from another person or animal?

<p>Passive immunity (D)</p> Signup and view all the answers

What is the main function of cholesterol in the cell membrane?

<p>Make the membrane more rigid and reduce lateral movement of phospholipids (D)</p> Signup and view all the answers

What is the purpose of maintaining a vacuum environment in an electron microscope?

<p>To prevent particles in the air from deflecting electrons out of beam alignment (D)</p> Signup and view all the answers

Which component of the cell membrane allows cells to adhere to one another and form tissues?

<p>Glycolipids (A)</p> Signup and view all the answers

What do intrinsic proteins in the cell membrane primarily function as?

<p>Allow substances to cross the membrane (B)</p> Signup and view all the answers

In a Transmission Electron Microscope (TEM), how are areas that absorb electrons represented in the images?

<p>They appear darker on the electron micrograph (A)</p> Signup and view all the answers

What is a key limitation of Scanning Electron Microscopes (SEM) and Transmission Electron Microscopes (TEM)?

<p>Living specimens cannot be observed due to the vacuum requirement (D)</p> Signup and view all the answers

Which type of molecule can easily pass through the cell membrane based on its structure?

<p>Lipid-soluble molecules (D)</p> Signup and view all the answers

What is the main purpose of cell fractionation?

<p>To separate different parts and organelles of a cell for detailed study (B)</p> Signup and view all the answers

Which component of the cell membrane acts as a cell surface receptor and neurotransmitter?

<p>Glycoproteins (C)</p> Signup and view all the answers

Which method is commonly used for cell fractionation?

<p>Differential centrifugation (A)</p> Signup and view all the answers

What is the role of glycolipids in the cell membrane?

<p>Extend from the surface and act as cell surface receptors (A)</p> Signup and view all the answers

What is the resultant fluid called after cells are blended in an homogeniser during cell fractionation?

<p>Homogenate (A)</p> Signup and view all the answers

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