Biology, 27.05.2020 22:05 arianna23717
Points
As Darwin explained, a small population of finches settled on the
Galapagos Islands. Darwin called these finches the founders, or founding
population. The founders became the ancestors of all the finch species
that Darwin observed on the islands. How did the founders compare with
other finches of the same species that remained in South America?*
Answers: 3
Biology, 21.06.2019 20:00
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
Answers: 1
Biology, 22.06.2019 09:30
Archaebacteria use for movement. celia flagella pili cell walls
Answers: 2
Biology, 22.06.2019 11:30
In a population that is in hardy-weinberg equilibrium, there are two possible alleles for a certain gene, a and a. if the frequency of allele a is 0.4, what fraction of the population is heterozygous? a. 0.40 b. 0.60 c. 0.16 d. 0.48
Answers: 1
Biology, 22.06.2019 17:00
The part of the eye that closes and opens to let light in is .
Answers: 2
Points
As Darwin explained, a small population of finches settled on the
Galapagos Islan...
As Darwin explained, a small population of finches settled on the
Galapagos Islan...
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