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Do they make it hard to define life?

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A computer cannot make a copy of itself.

Consider scientific calculators, inventory scanners, GPS units, cellphones, cordless phones, pagers, beepers, walkie-talkies, PDAs, TV remote controllers, keyless entry buttons, Gameboys, Walkmans, iPods, guitar tuners, electronic or medical diagnostic kits, digital cameras, smoke detectors, portable radios, digital thermometers and cordless shavers.

Without a cell, viruses and prions are merely inert, complicated particles which do nothing.

A new action potential can only be triggered with a new stimulus which comes from neurotransmitter activated ion channels at locations of synaptic interaction between neurons or neurons and muscle cells.

The units can be identical forming a homo-polymer.

The origin of Eukaryotes possibly occurred in the process of endosymbiosis, shown below. Both mitochondria and chloroplasts have characteristics of bacteria, including their own DNA and bacterial ribosomes.

Beijerinck MW (1894) Over sulfaatreductie door Spirillum desulfuricans. Verslagen van de Koninklijke Akademie van Wetenschappen, Wiskunde and Natuurkunde 1894(III): 72–82.

Polymers can be made of strings of different units.

- The bacteria and Fungi are "decomposers," in that they break down dead bodies of other organisms, so that the chemicals can be recycled through the environment. Although some species cause diseases, many are beneficial, and we could not live without bacteria and fungi.

The Plants and some algae arose from one group of Bacteria, while Animals, Fungi, and other Protists arose from a different group of Bacteria. Chloroplasts and Mitochondria represent two groups of bacteria that made photosynthesis and aerobic cellular respiration possible. These bacteria entered into other cells (see the theory of endosymbiosis below), and possess their own DNA in a circular chromosome, ribosomal RNA (which differs from eukaryotic rRNA), and they divide and grow on their own within eukaryotes. The Archaebacteria have more in common with Eukarya than they do with the Eubacteria. Among Eukaryotes, basal bodies, centrioles, flagella, and cilia arose from an endosymbiotic spirochaete-like bacteria. Some colonial bacteria also exist with fruiting bodies and spores (similar to fungi).

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  • They can also live in extreme habitats like hot springs and under ..

    But neither can reproduce itself; each needs the machinery of a living cell to carry out its reproduction.

  • Each level of the hierarchy can be divided into smaller units ..

    And where does it come from?

  • Gordon's Introduction to The Kindoms of Life

    "The data now show that some proteins can carry hereditary information as well.", by Steven M.

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Mono-cell Organisms - A Review of the Universe

A cell can make a complete copy of itself; it contains the complete instructions (programs) and the cellular machinery (hardware) necessary to reproduce itself.

Prokaryotes are smaller and simpler than eukaryotic cells

It requires parallel computer architecture on a huge scale to operate multicelled creatures such as mammals with millions of millions of cells, all working in harmony, each doing its task.

Bacteria & Virus Lesson Plans: Microorganism, Fungi

Plants and simple animals can be haploid, diploid, or polyploid, whereas humans cannot. Our brain is so complex that even part of one chromosome missing or duplicated, causes retardation, and often sterility. Some polyploid species of plants are produced artificially to increase food supplies.

AP essay questions - Biology Junction

Some axons in the peripheral nervous system connecting to muscle cells or connecting sensory neurons from the skin, eye, or internal organs to the central nervous system can be quite long (measure in centimeters; 1 inch = 2.54 cm) compared to the size of an average cell (measured in micrometers).

Glossary of Scientific Terms - What Is Life?

The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of life forms on Earth by stimulating biodiversity and leading to the near-extinction of oxygen-intolerant organisms. According to endosymbiotic theory, chloroplasts in plants and eukaryotic algae have evolved from cyanobacterial ancestors via endosymbiosis.

IBWorldme is a resource site for the 2016 IB Biology curriculum

Cyanobacteria can be found in almost every terrestrial and aquatic habitat, from oceans to fresh water to bare rock to soil. They can occur as planktonic cells or form phototrophic biofilms in fresh water and marine environments, they occur in damp soil, or even on temporarily moistened rocks in deserts. A few are endosymbionts in lichens, plants, various protists, or sponges and provide energy for the host. Some live in the fur of sloths, providing a form of camouflage.

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