Biology, 29.12.2019 22:31 kemzzoo7206
The macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. what main elements do all of have in common?
a) carbon and sulfur
b) carbon and hydrogen
c) oxygen and nitrogen
d) oxygen and phosphorus
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, 22.06.2019 04:30
Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?
Answers: 1
Biology, 22.06.2019 05:00
What is the farthest destination to date for a human spaceflight mission?
Answers: 1
The macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. what main...
Computers and Technology, 30.10.2019 06:31