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Lana71 [14]
3 years ago
10

Assume you stain Bacillus by applying malachite green with heat and then counterstaining with safranin. Through the microscope,

the green structures are Assume you stain Bacillus by applying malachite green with heat and then counterstaining with safranin. Through the microscope, the green structures are endospores. capsules. cell walls. flagella. The answer cannot be determined.
Biology
1 answer:
kondor19780726 [428]3 years ago
5 0

Answer:

The correct answer is:

endospores

Explanation:

endospores are spores formed by certain genera of bacteria eg, Bacillus. Spores generally are formed by the vegetative (growing) part of bacteria cells in response to adverse or unfavorable conditions. Spores are inactive and dehydrated and can stay dormant for a very long time, only germinating when the conditions are right. The outer covering of spores are made of tough protein coats, hence they do not take up conventional stains, but special staining methods like Malachite green can be used, and since the method makes use of heating, the primary stain (Malachite green) is forced into the tough coat of the spores (stains green), and resists the decolorization step, while the vegetative cells are easily decolorized, and take up the counterstain (Safranin), which stains the parent cells red.

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Answer:

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3 years ago
At label ________, the cell is not hyperpolarized; however, repolarization is in progress, as the sodium channels are inactivate
azamat

Answer: C

Explanation:

When a neuron receives a stimulus, the sodium channels present in the membrane are opened, and therefore Na+ enters the cell in favour of the concentration gradient, so that the membrane potential changes to positive by means of ion exchange, producing depolarization. If this depolarization reaches a certain threshold value, an action potential is generated. The next step is the opening of the potassium channels and the inactivation of the sodium channels, so that the repolarization of the membrane takes place. The sodium channels, will return to the closed state in the hyperpolarization to continue in this state during all the rest potential achieving the action potential to return to -70 mV (repolarization).; until the arrival of a new action potential which produces the activation and opening of the sodium channels, repeating the cycle again and generating a new depolarizing action. This process is part of the synaptic transmission.

So, hyperpolarization is any change in the cell's membrane potential, which makes it more polarized. This means, hyperpolarization is an increase in the absolute value of the cell's membrane potential. Thus, changes in membrane voltage where the membrane potential is more distinctly positive or negative are hyperpolarizations.

During the repolarization period after an action potential, the membrane potential is more negative than when the cell is in "rest period". In the picture, this repolarization period is about 1-2 milliseconds. <u>So, repolarization is the time in which the membrane potential is hyperpolarized with respect to the resting potential.</u>

In the attached figure, part C indicates this repolarization period.

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Hope this helps!

~ Kana ^^
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