In the study of human evolution, scientists define modern in terms of: a designated time frame between the upper and lower paleolithic. traits like large browridges, large nasal sinuses, and a large masticatory complex. a series of anatomical traits that distinguish cro-magnon features from neandertals. a series of distinctive anatomical traits that contrast with archaic traits from earlier hominins.

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

Environmental impacts on evolution : mastery test

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.