Podcast
Questions and Answers
What is the main difference between passive transport and active transport?
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?
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?
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?
What is the role of membrane potential in influencing molecular transport?
Why do cells have concentration gradients for various molecules?
Why do cells have concentration gradients for various molecules?
What is the unit of measurement for the magnitude of the membrane potential?
What is the unit of measurement for the magnitude of the membrane potential?
What is the typical sign of the net electric charge inside a cell relative to outside?
What is the typical sign of the net electric charge inside a cell relative to outside?
What is the result of the unequal distribution of positively charged ions and negatively charged ions across the plasma membrane?
What is the result of the unequal distribution of positively charged ions and negatively charged ions across the plasma membrane?
What is the typical net electric charge of the total electrolytes in the human body?
What is the typical net electric charge of the total electrolytes in the human body?
What is the typical approximate value of the membrane potential (Vm) in many cells?
What is the typical approximate value of the membrane potential (Vm) in many cells?
