What causes atmospheric convection? a. energy from deep in the earth heats the ground, heating air at the surface and causing the air to rise. b. energy from deep in the earth cools the ground, cooling air at the surface and causing the air to sink. c. the sun's energy heats the ground, heating air at the surface and causing the air to rise. d. the sun's energy cools the ground, cooling air at the surface and causing the air to sink.

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

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Isotopes of the same element have differ in their