in

Characteristics of amoeba

What is an amoeba ?

Amoeba or amoeba is a unicellular protista of the genus Amoeba . It is a protozoon characterized by its changing form, since it lacks a cell wall, and by its ameboid movement based on pseudopods , which it also uses to capture food through the process called phagocytosis . Species of this genus live free in water or on land, feeding on smaller organisms or decomposing particles. Due to the ease with which they are obtained, they can be stored in laboratories, since they are common objects of study.

 

Characteristics of amoeba

Shape/Size

Larger ones exceed 1 mm, but most are around 10-100 ?m. There are nuclei in the cells, but there are mononuclear ones and polynuclear ones, and they vary depending on the taxonomic group. At the trailing edge of the cell there is one disc shaped retractor .

 

As amoebas move as a result of protoplasmic flow, their appearance continues to change, so it is sometimes said that ” Ameba does not take the same shape again in their lifetime ” and so on. However, it is not a completely amorphous form as generally said, but the approximate shape is determined by genus and species. Roughly divided, there are the following three types.

  • It always gives one wide temporary foot at a time. As a whole it becomes oval or slugged. Normally the direction of travel will be wider.
  • Gives two temporary feet. This is the most amebic figure, and its shape changes intensely.
  • Those that give a lot of thin rod shaped temporary feet.

Because there are things that change type depending on environmental conditions and circumstances, it is not necessarily said that these differences are species differences. Furthermore it is classified finely by the character of the temporary feet and the structure of the nucleus. However, even within the same species, there seems to be various differences depending on lineage, and there seem to be difficulties.

MORPHOLOGY

Amoebae have the typical structure of a eukaryotic cell, presenting cytoplasm, nucleus and various organelles. The cytoplasm is divided into a central granular mass called the endoplasm and a lighter outer layer called ectoplasm. The amoeba moves by extending the cytoplasm outward, forming extensions similar to tentacles, known as pseudopods or false feet. Pseudopods are also used to wrap the food in a process known as phagocytosis.

 

WHERE DO YOU LIVE

The amoeba is typically found in decaying vegetation. However, due to the ease with which they are obtained, they can be stored in laboratories, since they are a common object of study

PHYSIOLOGY

The amoeba moves by extending the cytoplasm outward and form tentacle-like extensions, known as pseudopods or false feet. The amoeba is an organism of heterotrophic nutrition . The formation of pseudopods occurs in response to chemical stimuli generated by the microorganisms that constitute their food; so that the pseudopods enclose the food microorganism on any part of its cell surface and introduce it into a cavity or vacuole. An acid secreted in the cavity decomposes this food into soluble chemical substances that are diffused from the cavity to the cytoplasm. Therefore, it is an intracellular digestion. This process is known as phagocytosis.

Waste material and undigested residues are eliminated through the vacuoles of the ectoplasm, which also absorbs oxygen from the liquid medium in which the amoeba is found and removes carbon dioxide originating in the metabolism . It is a form of breathing . After a period of growth, the amoeba reproduces by division into two equal parts.

FEEDING

The amoeba is an organism of heterotrophic nutrition because it feeds on all kinds of microscopic plants and animals and bacteria. The formation of pseudopods occurs in response to chemical stimuli generated by the microorganisms that constitute their food; so that the pseudopods encompass the food microorganism and introduce it into a cavity or digestive vacuole. This can be done at any point on the cell surface, since the amoeba does not have a localized mouth. An acid secreted in the vacuole decomposes this food into soluble chemical substances that are diffused from the cavity to the cytoplasm. Therefore, it is an intracellular digestion. This process is known as phagocytosis.The unused parts are eliminated .

 

COMMUNICATION

Amoebae do not have a nervous system, but communicate through the interaction of the cell membrane with the outside that surrounds it. In response, for example, to a noxious, irritant or alimentary stimulus, the intracellular communication produces a reaction of the whole cell, moving away or approaching the respective stimulus. 
Reproduction 
Mature amoebas multiply asexually by binary fission, in which the genetic material is duplicated by mitosis, while the cell lengthens and the cytoplasm is divided into two daughter cells. Each one keeps a copy of the DNA.

 

REPRODUCTION

Mature amoebas multiply asexually by binary fission, in which the genetic material is duplicated by mitosis , while the cell lengthens and the cytoplasm is divided into two daughter cells. Each one keeps a copy of the DNA . No sexual reproduction among amoebas has been observed .

 

MOVEMENT

The amoeba moves by extending the cytoplasm outward and form tentacle-like extensions, known as pseudopods or false feet. 
so that the pseudopods enclose the food microorganism on any part of its cell surface and introduce it into a cavity or vacuole.

Leave a Reply

Your email address will not be published.

The advantages of using a pregnancy calculator?

CHARACTERISTICS OF A CROCODILE