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Why 70 percent ethyl alcohol is used rather than 90 percent or 95 percent?
70% alcohol has been found to be more effective in killing microbes.Higher and lower concentration may not be as effective.90% alcohol coagulate proteins in contact.suppose 90% alcohol is poured over one celled organism,the alcohol penetrate the cellwall of the organism.the coagulated protein would then prevent the alcohol further from the cell and no more coagulation then take place.now,if 70% alcohol is added into one celled organism.The diluted alcohol also coagulates the protein, but at a slower rate,so that it penetrates all the cell before coagulation.Then all the cell coagulated and the organism died.
Is the surface-area-to-volume ratio of a small cell less than that of a larger cell?
As a cell becomes larger the surface area to volume ratio gets smaller. The volume increases by the square of the surface area. That is the main reason that one celled organisms are small.
Can you see into the second dimension?
As you know, 3d stands for 3 dimensional. We see in 3d everyday. We can also move in 3d. We call it 3 dimensional because we can move (up and down, left to right, and forward and backwards). If you eliminate one of these sets of movements then you eliminate a dimension and you are now in 2d. We an see in the 2nd dimension and 1st dimension because we are at 3d. But we cannot see a 4d (if there is one. there are theories that there are an infinite number of dimensions) because we are not able to move with in the boundaries of 4d.
What are 7 different kinds of algae?
Diatoms - Unicellular orgasnisms of the protista kingdom.Chlorophyta - A division of the kingdom of protista (known as green algae).Euglenophyta - Small phylum of the protista kingdom (mostly unicellular).Dinoflagellata - A large group of protists, many of these organisms contain chlorophyll.Chrysophyta - Eukaryotic algae (known as goldenalgae).Phaeophyta - Belonging to the protista kingdom (known as brown algae).Rhodophyta - Belonging to the protista kingdom (known as red algae).
