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Amanda [17]
3 years ago
7

The exchange of gases across a respiratory surface always occurs by

Biology
1 answer:
ivanzaharov [21]3 years ago
3 0
Inhalation or exhalation
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Why is it important to stain youngcultures of bacteria with<br> the grain stain?
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Answer:

Because older cultures of gram-positive bacteria tend to lose their ability to retain crystal-violet in the peptidoglycan of their cell walls and can be confused with gram-negative bacteria.

Explanation:

Gram staining is used to differentiate between two major groups of bacteria. Gram-positive and gram-negative, these bacteria differ in the amount of peptidoglycan in their cell walls. Gram-positive bacteria have a higher amount of peptidoglycan, which absorbs the violet crystal complex used in gram staining, staining them purple/violet. Old cultures of gram-positive bacteria tend to lose the ability to retain the violet crystal and are stained by safranine, staining them red/pink and appear to be gram-negative.

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A scientist performed an experiment on mice. Her results are posted below. Lung Cancer in Mice Experiment Group Duration of Ciga
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No; some mice may have developed lung cancer in less than 500 days of cigarette smoke exposure.

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Asexually reproducing organisms produce offspring that are genetically identical to each other and to the parents. What type of
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Es  mitotic

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Pues la mitosis es un proceso de división celular ligado a la reproducción asexual, en la que únicamente es necesario un individuo para generar descendecia.

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Which of the following best describes the movement of water underground?
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