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Bacterial cell Human cell Comparison Diameter 1μm 10μm Bacterium is 10 times smaller. Surface area 3.1μm 2: 314μm 2: Bacterium is 100 times smaller. Volume 0.52μm 3: 524μm 3: Bacterium is 1000 times smaller. Surface-to-volume ratio 6 0.6 Bacterium is 10 times greater.
The number of cells in these groups vary with species; it has been estimated that the human body contains around 37 trillion (3.72×10 13) cells, [7] and more recent studies put this number at around 30 trillion (~36 trillion cells in the male, ~28 trillion in the female).
Some species of bacteria kill and then consume other microorganisms; these species are called predatory bacteria. [206] These include organisms such as Myxococcus xanthus , which forms swarms of cells that kill and digest any bacteria they encounter. [ 207 ]
25.4 μm – 1/1,000 inch, commonly referred to as 1 mil in the U.S. and 1 thou in the UK; 30 μm – length of a human skin cell; 30.8568 μm – 1 zeptoparsec; 50 μm – typical length of Euglena gracilis, a flagellate protist [95] 50 μm – typical length of a human liver cell, an average-sized body cell [citation needed]
The "reference" 70 kg human body is estimated to have around 39 trillion bacteria with a mass of about 0.2 kg. [2] [3] [4] [5] These can be separated into about ...
Bacterial growth is proliferation of bacterium into two daughter cells, in a process called binary fission. Providing no mutation event occurs, the resulting daughter cells are genetically identical to the original cell. Hence, bacterial growth occurs. Both daughter cells from the division do not necessarily survive.
The cell cycle's goal is to precisely copy each organism's DNA and afterwards equally split the cell and its components between the two new cells. Four main stages occur in the eukaryotes. In G1, the cell is usually active and continues to grow rapidly, while in G2, the cell growth continues while protein molecules become ready for separation.
The adult human body averages ~53% water. [7] This varies substantially by age, sex, and adiposity. In a large sample of adults of all ages and both sexes, the figure for water fraction by weight was found to be 48 ±6% for females and 58 ±8% water for males. [8]