Peroxisome Flashcards
Where are peroxisomes located in the cell?
In the cytoplasm of eukaryotic cells, usually near the endoplasmic reticulum and mitochondria.
Are peroxisomes found in plant and animal cells?
Yes, they are found in both plant and animal cells.
How do peroxisomes vary in cells?
They vary in shape, size, and number based on the cell’s energy requirements.
What is the structure of the peroxisomal membrane?
It is made of a phospholipid bilayer with numerous membrane-bound proteins.
Where are the phospholipids for peroxisomes synthesized?
In the smooth Endoplasmic Reticulum (SER).
How do peroxisomes grow and divide?
They grow by protein and lipid uptake and then divide into two organelles.
What role do peroxisomes play in lipid metabolism?
They engage in oxidative processes, breaking down lipids and metabolizing D-amino acids, polyamines, and bile acids.
How do peroxisomes neutralize reactive oxygen species?
Enzymes like catalase and peroxidase convert reactive oxygen species (e.g., peroxides) into water.
What role do peroxisomes play in plant cells?
They support photosynthesis and seed germination by conserving energy during carbon fixation.
Where are enzymes involved in lipid metabolism synthesized?
They are synthesized on free ribosomes and then sent to the peroxisome
