Cell Biology: Essential Principles of Membrane Transport

Posted by on Mar 15, 2026 in Health Biology | 0 comments

Cellular Compartments and Nuclear Transport

Like the lumen of the ER, the interior of the nucleus is topologically equivalent to the outside of the cell. (True)

Researchers in a biotechnology company have discovered a drug that blocks the ability of Ran to exchange GDP for GTP. What is the most likely effect of this drug on nuclear transport? (Nuclear transport receptors would be unable to release their cargo in the nucleus.)

What is the role of the nuclear localization sequence in a nuclear protein?

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Skin and Mucosal Immunity: Extracellular vs Intracellular

Posted by on Mar 20, 2025 in Health Biology | 0 comments

Extracellular Pathogens – Skin

When an extracellular pathogen enters through the skin, the innate immune system activates several responses to detect and eliminate it:

  • Pathogen Recognition: Pattern Recognition Receptors (PRRs) like TLR2 and TLR4 detect Pathogen-Associated Molecular Patterns (PAMPs) on the pathogen’s surface.
  • Inflammation: Macrophages and keratinocytes release pro-inflammatory cytokines (IL-1β, TNF-α) to recruit immune cells.
  • Phagocytosis and Antigen Presentation: Macrophages and Dendritic
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