BIOC405 LECTURE 12 EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
Biological membranes must be ____
selectively permeable and allow for transmission of molecules and information
Membranes can be used to _____
store energy and utilize that energy by maintaining concentration gradients
What properties do membranes have to make them flexible?
They must adapt to previous shapes and be self sealing (can't let cells leak) by:
- must accommodate proteins of various types and shapes
- must allow for diffusion (both lipids and proteins)
- must allow for vesicle formation and membrane fusion
How can new membranes form?
Sprout from existing membrane or multiple membranes come together to make new
membrane
Most eukaryotic cells contain ______. What is an exception?
Different types of membranes
Red blood cells are an exception
Describe the role of membranes in mitochondria during energy generation
Proteins involved in these processes are shuttled to mitochondria from ER, and then
ATP made in mitochondria are shuttled elsewhere. This passage of information is
carried out by membranes
, Briefly explain the process of a synapse
1. A NT is enclosed by a membrane, forming a synaptic vesicle
2. The SV fuses w presynaptic membrane, releasing the NT into the synapse
3. The NT interacts w proteins on post synaptic membrane, which send a message that
gets transmitted in cell
What is a synaptic vesicle surrounded by?
Tons of surface proteins
What are the 3 important surface proteins of a synaptic vesicle? What do they
do?
Synaptobrevin: most abundant. Is 1 of 3 proteins that forms "SNARE complex", which
mediates vesicle fusion w pre-synaptic membrane
V-ATPase: used to maintain acidic environment in vesicle by hydrolyzing ATP and using
that energy to drive movement of protons inside vesicle
Synapsin: Used for regulating membrane fusion
What is the major lipid component of a SV membrane? What are features of it?
Glycerophospholipids
Amphiphilic (hydrophilic head, hydrophobic tail)
What do properties of lipid molecules arise from?
arise from properties of fatty acid tails
What are characteristics fatty acids?
WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
Biological membranes must be ____
selectively permeable and allow for transmission of molecules and information
Membranes can be used to _____
store energy and utilize that energy by maintaining concentration gradients
What properties do membranes have to make them flexible?
They must adapt to previous shapes and be self sealing (can't let cells leak) by:
- must accommodate proteins of various types and shapes
- must allow for diffusion (both lipids and proteins)
- must allow for vesicle formation and membrane fusion
How can new membranes form?
Sprout from existing membrane or multiple membranes come together to make new
membrane
Most eukaryotic cells contain ______. What is an exception?
Different types of membranes
Red blood cells are an exception
Describe the role of membranes in mitochondria during energy generation
Proteins involved in these processes are shuttled to mitochondria from ER, and then
ATP made in mitochondria are shuttled elsewhere. This passage of information is
carried out by membranes
, Briefly explain the process of a synapse
1. A NT is enclosed by a membrane, forming a synaptic vesicle
2. The SV fuses w presynaptic membrane, releasing the NT into the synapse
3. The NT interacts w proteins on post synaptic membrane, which send a message that
gets transmitted in cell
What is a synaptic vesicle surrounded by?
Tons of surface proteins
What are the 3 important surface proteins of a synaptic vesicle? What do they
do?
Synaptobrevin: most abundant. Is 1 of 3 proteins that forms "SNARE complex", which
mediates vesicle fusion w pre-synaptic membrane
V-ATPase: used to maintain acidic environment in vesicle by hydrolyzing ATP and using
that energy to drive movement of protons inside vesicle
Synapsin: Used for regulating membrane fusion
What is the major lipid component of a SV membrane? What are features of it?
Glycerophospholipids
Amphiphilic (hydrophilic head, hydrophobic tail)
What do properties of lipid molecules arise from?
arise from properties of fatty acid tails
What are characteristics fatty acids?
