Biology, 12.06.2021 14:00 darlene1283
Which of the following describes copepods?
tiny, single-cell creatures that scientists believe were instrumental in the development of evolution
small sea crustaceans from the order of macroplankton of about 20-200 millimeters that are visible with the naked eye
microscopic organisms that drift in both marine and freshwater environments and perform photosynthesis
a genus of large brown seaweed that floats in island-like masses, called beds, and is common in waters off the U. S. South Atlantic coast
Answers: 1
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, 21.06.2019 23:00
How do chloroplasts set plants apart from other living things
Answers: 1
Biology, 22.06.2019 14:40
Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates
Answers: 3
Which of the following describes copepods?
tiny, single-cell creatures that scientists believe were...
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