Cell Biology: Chemical Debring Forces and Passive Transport
10 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main difference between passive transport and active transport?

  • Active transport does not require any proteins while passive transport does.
  • Passive transport is slower than active transport due to the absence of transport proteins.
  • Active transport moves molecules down the concentration gradient while passive transport moves them against it. (correct)
  • Passive transport requires energy while active transport does not.

    • What factor other than the chemical driving force can affect molecules moving across membranes?

  • Temperature gradients
  • Pressure differentials
  • Electrical driving forces (correct)
  • Gravity

    • Why is a concentration gradient referred to as a driving force?

  • Because it provides energy for active transport.
  • Because it influences the direction of molecule movement across the membrane. (correct)
  • Because it helps to maintain equilibrium between intra and extracellular fluids.
  • Because it determines the speed of passive transport.

    • What is the role of membrane potential in influencing molecular transport?

    <p>It creates electrical driving forces that impact molecule movement.</p> Signup and view all the answers

    Why do cells have concentration gradients for various molecules?

    <p>To serve as a driving force for molecular movement</p> Signup and view all the answers

    What is the unit of measurement for the magnitude of the membrane potential?

    <p>Millivolts</p> Signup and view all the answers

    What is the typical sign of the net electric charge inside a cell relative to outside?

    <p>Negative</p> Signup and view all the answers

    What is the result of the unequal distribution of positively charged ions and negatively charged ions across the plasma membrane?

    <p>The formation of a membrane potential</p> Signup and view all the answers

    What is the typical net electric charge of the total electrolytes in the human body?

    <p>Zero</p> Signup and view all the answers

    What is the typical approximate value of the membrane potential (Vm) in many cells?

    <p>Vm = -70 mV</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser