Mitochondrial Structure 0.0 / 5 ? BiologyMetabolismInternational BaccalaureateOther Created by: Lotto65Created on: 18-03-17 16:42 What do we mean by adaptation? That structure and function are closely related in living organisms and structure can change to carry out a function more efficiently 1 of 25 What is adaptation the result of? Evolution by natural selection 2 of 25 What does the outer mitochondrial membrane do? Separates the contents of the mitochondrion from the rest of the cell, creating a compartment with ideal conditions for aerobic respiration 3 of 25 What does the matrix contain? A fluid containing enzymes for the Krebs cycle and link reaction 4 of 25 What else is present in the matrix other than enzymes? 70S ribosomes and a naked loop of DNA 5 of 25 What happens in the space between the inner and outer membranes of a mitochondrion? Protons are pumped in by the electron transport chain 6 of 25 What is the advantage of the intermembrane space being small? A high proton concentration can easily be formed (in chemiosmosis) 7 of 25 What are cristae? Tubular or shelf-like projections of the inner membrane 8 of 25 What do the cristae do? Increase the surface area available for oxidative phosphorylation 9 of 25 What does the inner mitochondrial membrane contain? Electron transport chains and ATP synthase 10 of 25 Name one process that takes place at the inner mitochondrial membrane Any from: Chemiosmosis, electron transport chain or oxidative phosphorylation 11 of 25 How can you obtain 3D images of active mitochondria? Electron tomography 12 of 25 What did electron tomography manage to reveal about cristae? Cristae are connected to the intermembrane space via narrow openings and the shape and volume of cristae change when a mitochondrion is active 13 of 25 How does natural selection give some organisms an advantage in terms of mitochondria? If mitochondrial structure varied, organisms with mitochondria that produced ATP most efficiently would have an adavantage 14 of 25 What sort of advantage would efficient mitochondria structure give living organisms? Increased chance of survival and produce more offspring 15 of 25 What type of organelle is a mitochondrion? A semi-autonomous organelle 16 of 25 What does semi-autonomous mean? Can grow and reproduce itself but still relies on the rest of the cell for resources 17 of 25 What does ribosome DNA do? Expresses mitochondrial genes 18 of 25 What can be a stimulus for a sudden change in idea? The development of new techniques 19 of 25 Does electron tomography show the outside or inside of a mitochondria? Inside 20 of 25 What do we mean by inner mitochondrial membranes being dynamic? They undergo fission and fusion in response to physiological stimuli and changes in metabolism 21 of 25 What is the possible reason for the narrow openings of cristae? To restrict diffusion of proteins and metabolites between compartments 22 of 25 What is topology? Membrane shape 23 of 25 What regulates the topology of the inner membrane? Specific proteins and lipids 24 of 25 True/false: The changes in topology of the inner membrane are random False - they are the result of internal diffusion pathways (allowing more efficient use of ADP) 25 of 25
Comments
No comments have yet been made