Compare and contrast algae fungi protozoa bacteria and viruses

By itself, a virus can accomplish nothing—it needs to enter a living thing to perform its only function, which is to replicate. When a virus gets inside a human body, it can hijack a person's cellular machinery to produce clones of itself, overtaking more cells and continuing to reproduce.

When the virus reproduces faster than the immune system can control it, it begins to destroy cells and harm the body. Viruses are also the smallest germ, making them generally the easiest to contract—they're so tiny they can spread through the air in a cough or a sneeze.

Some viruses also are spread by mosquitoes or through bodily fluid. Since each virus is very different, no one drug exists to attack whichever virus is in your body.

Vaccines give preemptive protection from certain viruses by training the body's immune system to recognize and attack a specific virus. Common forms: Bacteria cause food poisoning, strep throat and urinary tract infections , as well as infections such as tuberculosis. Bacteria are bigger and more complex than viruses, though they can still spread through the air. A bacterium is a single cell, and it can live and reproduce almost anywhere on its own: in soil, in water and in our bodies.

For the most part, we live peacefully with bacteria—the colonies in our guts are helpful to us and strengthen our immune system. But like viruses, bacteria can also harm us by replicating quickly in our bodies, killing cells.

Some bacteria also produce toxins which can kill cells and cause an outsized, damaging immune reaction. Broad-spectrum antibiotics were developed to kill bacteria in our bodies and in the food supply by inhibiting their growth.

But bacteria are extremely adaptive and can quickly evolve to evade antibiotics. Bacteria share their antibiotic-resistant genes with each other, meaning more strains generate resistance to the drugs we use.

Common forms: Fungi are responsible for causing conditions such as yeast infections , valley fever and meningitis. Fungi are more complicated organisms than viruses and bacteria—they are "eukaryotes," which means they have cells.

Once they've moved into someone's body, though, viruses spread easily and can make a person sick. Antibiotics are not effective against viruses. Antiviral medicines have been developed against a small, select group of viruses. Fungi pronounced: FUN-guy are multicelled, plant-like organisms. A fungus gets nutrition from plants, food, and animals in damp, warm environments. Many fungal infections, such as athlete's foot and yeast infections , are not dangerous in a healthy person.

People who have weakened immune systems from diseases like HIV or cancer , though, may develop more serious fungal infections. Protozoa pronounced: pro-toe-ZO-uh are one-celled organisms, like bacteria. But they are bigger than bacteria and contain a nucleus and other cell structures, making them more similar to plant and animal cells.

Protozoa love moisture, so intestinal infections and other diseases they cause, such as amebiasis and giardiasis, often spread through contaminated water. A bacteria does not have a nucleus and often does not even contain organelles. They reproduce only asexually. A fungus on the other hand is a eukaryotic. It reproduces sexually as well as asexually. It is normally found as a single cell. A virus is a sub-microscopic agent that can grow or reproduce outside a host cell.

Virus does not have cell and on the other hand they have genes and evolve by natural selection. Protozoa on the other hand, is unicellular eukaryotes. They are microscopic in nature. They are hebirvores and play a rolemin decomposition chain as well. Algae is a plant like organism that can be unicellular as well as multicellular.

They have a nucleus in a membrane and a chloroplast. Bacteria are single celled living organisms that lack a nucleus. Protozoa are also single celled with a nucleus. Fungi reproduce through spores and have no chlorophyll cannot use the sun to make food.

Viruses are non-living however they can reproduce by hijacking another living cell to multiply. Like viruses, bacteria lack a nucleus while protozoa have a nucleus. Unlike bacteria, viruses and protozoa both do not have cell walls. Bacteria divide using either conjugation or binary fission like protozoa while viruses take over the host cell and their viral DNA gets replicated.

They are all pathoges cause diseases and parasites too. However, only bacteria and protozoa are benefial to humans. Bacteria are unicellular prokaryotes, viruses aren't cells and protozoa are unicellular eukaryotes. Bacteria are cells, with no nucleus and no organelles. Protozoa are cells with nucleii and organelles. Viruses are not cells, but have a capsid containing the nucleic acids. Bacteria can be either eubacteria they have peptodoglycans in their cell walls or archaebacteria do not have peptodoglycans in their cell walls.

They can be grouped using a gram-stain test, or by comparing their cell metabolism. Viruses are grouped according to the shape that their capsids are. Protozoa are grouped by the way they locomote - using pseudopods, cilia, spores or flagella.