How many bases make up a rung?

What are the sources of error that you can get from respiration? Cells with a higher surface area-to-volume ratio have a harder time with the exchange of material into and out of the cell? When to monosaccharides combine to make a disaccharide what additional molecule is formed? Distinguish nastic non directional movements from tropic responses? A structure in some bacteria that is resistant to adverse environmental factors is a? Why is it difficult to find evidence if there is life on other planets? What is the physical state of mantle? what buffer has a pH of 8.10? What effects does union of haploids in fertilization have on genetic diversity? How many atoms are in 14.500g Cr? What fault occurs when the blocks of rock slide horizontally past each other? What is grasslands nutrients? What are 4 proteins found in a cell membrane? Electroplating of copper can be made on iron but not in silver why? What are thick low clouds that are a sign of rain called? 1650 square feet equal to how many meter? What is a slightly movable known as? What are the names of the two major groups of dinosaurs? What is the enzyme produced by the salivary glands? Where can one find a used GPS system?