Biology, 28.01.2021 04:50 MysteryDove12
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Any variation that can help an organism survive in its environment is called a(n):
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vestigial structure
derived characteristic
analogous structure
adaptation
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Biology, 21.06.2019 15:30
How are rocks that cooled within magma chambers found on earth’s surface today? they are pushed up by magma under earth’s surface. they are revealed by erosion of earth’s surface over time. they are pushed to earth’s surface because of their larger size. they are revealed at earth’s surface due to their low density.
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Biology, 21.06.2019 17:30
In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?
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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
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Biology, 21.06.2019 23:00
Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy
Answers: 3
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Any variation that can help an organism survive in its environment is called a(n):
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