Lysosomes, Mitochondria Flashcards
Lysosomes are…
spherical sacs, surrounded by a single membrane and having no internal structures.
Lysosomes diameter
0.1-0.5 micrometres
Lysosomes contain…
digestive(hydrolytic) enzymes, which must be kept separated from the other organelles.
Lysosomes are responsible for…
the breakdown of unwanted structures such as old organelles.
In white blood cells, lysosomes are…
used to digest bacteria.
Enzymes are sometimes released…
outside the cell. E.g. in the replacement of cartilage with bone during development.
The heads of sperm contain special…
lysosome, the acrosome, for digesting the path.
Mitochondria diameter
1 micrometre
Mitochondria can be…
various shapes, often sausage-shaped.
Mitochondria are surrounded by…
double membrane(envelope).
Cristae
The inner membrane is folded to form finger-like cristae which project the interior solution called the matrix.
Intermembrane
The space between the two membranes.
The outer membrane of mitochondria contains…
transport protein called porin, which forms wide aqueous channels allowing easy access of small, water-soluble molecules from the cytoplasm to enter the intermembrane space.
The inner membrane is far more…
selective barrier. It precisely controls which ions and molecules can enter the matrix.
Another function of mitochondria is…
the synthesis of lipids.
