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Xelga [282]
3 years ago
7

13. Natural selection is the most powerful of all the processes that change what in a

Biology
1 answer:
LiRa [457]3 years ago
3 0
It changes heritable traits and phenotypes
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Why is it important to stain youngcultures of bacteria with<br> the grain stain?
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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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living things do not reproduce

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What traits can make a cell special, why are cells specialized…<br><br> (Minimum 5 sentences)
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They are modified by shape, function, or size. They are made to have certain roles in different parts of our bodies. These cells group together to make/form tissues. Then these tissues make up organs that we obviously need. Different specialized cells include blood cells, nerve cells, and reproductive cells.

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