Nitrogen fixation is the conversion of nitrogen gas into ammonia. Please select TWO answers of how this can occur: A)air on top of the top layer of soil comes in contact with particular types of nitrogen-fixing bacteria

B)overflow of water within the soil

C)man-made fertilizers on farm fields exceed natural nitrogen levels in the soil and kill all the bacteria

D) by the intense energy of a lightening strike

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip. nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule. true/false

Select three sports that require participants to be highly fit before the beginning a: snowboarding b: skydiving c: rock climbing d: bungee jumping e: free diving f: hiking

When you exhale, air in you lungs moves from the does anyone know the correct answer on apex