Answer:
The correct answer is: B. pure culture.
Explanation:
- Sputum sample contains varied types of bacteria.
- When this sample is cultured on a growth medium all the different types of bacteria grow on it.
- A single distinct colony of bacteria is formed from by multiple divisions of a single bacterial cell.
- In the given growth medium distinct colonies of bacteria are formed.
- Each such colony is formed from a single bacteria.
- When such a single distinct colony is inoculated in a separate medium and bacteria is grown in that, then a Pure culture of bacteria is generated.
- A Pure culture can be defined as such a culture which is comprised of single type of bacterial cell, formed from a single bacteria.
Explanation:
An ionic bond is formed when one atom (usually a metal) donates its valence electrons to another atom (usually a non-metal) so they attain stable electron configuration. The two atoms become joined by electrostatic forces which result from the charges acquired by the atoms as a result of donating or receiving electrons.
An example is NaCl. Na (2.8.1) donates its one valence electron to achieve the stable configuration of (2.8.8) while CL (2.8.7) receives the electron to achieve stable electron configuration of 2.8.8. The Na is left with a positive charge while Cl is left with a negative charge. The two charged atoms attract each other and form an ionic bond.
Learn More:
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