Cell Biology and Structure

Cytoplasmic streaming, or cyclosis, is the directed flow of cytosol and organelles around the cell, which facilitates the transport of materials.

The cell membrane (plasma membrane) is a universal feature of all living cells, acting as a selective barrier between the cell interior and the environment.

Mitochondria are the powerhouse of the cell because they generate ATP. Lysosomes are the digestive/suicide bags.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes:(i) Smooth endoplasmic reticulum (SER) in which the surface of the tubules lacks granules. (ii) Rough endoplasmic reticulum (RER) in which the surface of the tubules contain numerous granule-like structures called ribosomes.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes: Smooth endoplasmic reticulum  and  Rough endoplasmic reticulum (RER) .Endoplasmic reticulum is absent in some cells such as embryonic cells and mature red blood corpuscles. It forms an internal supporting framework for the cell, called cytoskeleton.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes.It provides surface for the synthesis of a variety of substances in the cell. SER provides surface for the synthesis of lipids while RER provides surface for the synthesis of proteins and carbohydrates.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes. It provides surface for the synthesis of a variety of substances in the cell. SER provides surface for the synthesis of lipids while RER provides surface for the synthesis of proteins and carbohydrates.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes. It facilitates the transport of materials inside the cell. It forms an internal supporting framework for the cell, called cytoskeleton.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes. It facilitates the transport of materials inside the cell. It forms an internal supporting framework for the cell, called cytoskeleton.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes.It provides a pathway for the distribution of nuclear material from one cell to another.

It is a system of highly branching membranes, which almost fills the space inside the cell membrane. Some of the branches of endoplasmic reticulum are connected to the plasma membrane while some of them are connected to the nuclear membrane. An examination of endoplasmic reticulum under the electron microscope reveals two types of membranes. Being highly coiled in nature, it provides an increased surface area for various enzyme catalyzed reactions.

Mitochondria are tiny structures that occur in varying shapes cylindrical, spherical, oval, rod shaped etc.. They are found distributed all over the cytoplasm. Each mitochondrion is bound by a double membrane. The outer membrane is smooth and straight, while the inner membrane is thrown into numerous folds called cristae. Thus, the surface area of inner membrane is much higher than that of outer membrane. The cristae bear numerous, minute, regularly spaced particles called elementary particles or oxysomes.