Amoebae move by growing an extension of their bodies in the direction of movement and then flowing into it. This extension is called a pseudopod because when it's fully extended it resembles a limb, despite being only an extension of the amoeba's plasma membrane.Know More
An amoeba is a single-celled protist and therefore lacks true limbs. Moving through a medium without the flagellum of other protists requires a special mechanism for shifting the contents of the amoeba's body. It accomplishes this by extruding a section of its protective outer layer, the plasma membrane, and creating a small mass that is farther along in the direction of movement than the main body of the amoeba. The contents of the amoeba's body, mostly cytoplasm and various organelles along with the amoeba's nucleus, then flow through the pseudopod and into the amoeba's new location.
The amoeba's movement is not just mechanical. The directed flow of cytoplasm within the amoeba's body depends on changes to the viscosity of the cellular fluids. This factor is tightly controlled by special proteins that, when activated, change the consistency of the amoeba's cytoplasm from thin and viscid to gelatinous. This chemical change renders the fluid at the end of the pseudopod relatively firm and allows the thinner cytoplasm of the amoeba's body to flow after it.Learn more about Molecular Biology & DNA
Heavenly bodies are the things that make up the universe, such as stars, planets and smaller objects. Within these categories are many different variations instead of one single type.Full Answer >
An amoeba is a single-celled microorganism with a cytoplasm, nucleus, cell membrane and several other organelles that perform the functions required for it to be considered a living thing. This type of microorganism belongs to the Protista kingdom. According to the website TutorVista.com, Amoebas are found in moist or wet areas and even inside animals.Full Answer >
Amoeba are unicellular eukaryotes with no cell wall. They reproduce using binary fission and move by the use of pseudopodia. Pseudopodia are false feet that extend out, and then the rest of the body follows. Amoeba are found in ponds, rivers and on the surface of leaves and plants.Full Answer >
Linus Pauling's contribution to DNA research was the triple-helix DNA model. This model, which was published in 1953, was incorrect, but it did lay the foundation for James Watson and Francis Crick's correct model of DNA as a double helix.Full Answer >