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Vikentia [17]
2 years ago
10

Help me with this one​

Biology
1 answer:
BARSIC [14]2 years ago
3 0
  • 19. Plant cell have plastids - chromoplasts, chloroplasts, leucoplasts.
  • 20. Animal cell do not have a cell wall. Its outermost covering is the cell membrane.
  • 21. Plant cell do not have centrosomes.
  • 22. Animal cell has cholesterol in the cell membrane.
  • 23. Either vacuoles are absent or present in small.
  • 24. Plant cell has chloroplast.
  • 25. Storage material is starch for plant cell.

Hope you could understand.

If you have any query, feel free to ask.

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In the classic Meselson and Stahl experiment, Coli are first grown in 15N-enriched media (0th generation) and subsequently switc
AfilCa [17]

Options are not provided inthe question. Th ecomplete question is as following:

In the classic Meselson and Stahl experiment, Coli are first grown in 15N-enriched media (0th generation) and subsequently switched to 14N media. A DNA sample isolated during the first generation of E. Coli grown in 14N media is subjected to a centrifugation step in a dense CsCl gradient. Assuming that replication occurs in a semiconservative fashion, the DNA sample will _______.

1) run as two bands (of equal intensity), one at the same position as a uniformly 15N-labeled DNA, and one at the same position as a uniformly 14N-labeled DNA.

2) run as one band, at the same position as a uniformly 15N-labeled DNA.

3) run as one band, at the same position as a uniformly 14N-labeled DNA. run as one band, at a position expected for a DNA containing a 14N:15N ratio equal to 7.

4) run as one band, at a position expected for a DNA containing a 14N:15N ratio equal to 1.

Answer:

1)

Explanation:

In 1957, Meselson and Stahl gave an experimental evidence for semi-conservative replication  of DNA, means that each DNA strand act as template for synthesis of new DNA.

For the experiment, they use  E. coli grown in heavy isotope of 15N nitrogen and switch to 14N nitrogen undergoing one, two, or three generations and the DNA samples are collected. The DNA samples are then mix with cesium chloride and separated as light and heavy DNA.

As the replication occurs in a semiconservative fashion, the double DNA sample will run as two bands with intermediate density, having mixtures of 15N and 14N DNA, either of which would have appeared as DNA.

Hence, the correct option is (1).

8 0
3 years ago
What is natural selection? Give example
Ksenya-84 [330]

Natural selection is the process in nature by which organisms better adapted to their environment tend to survive and reproduce more than those less adapted to their environment. For example, treefrogs are sometimes eaten by snakes and birds.

8 0
2 years ago
What organelle processes and sorts proteins to be shipped
Rashid [163]

Answer: The Golgi apparatus

Explanation: The Golgi apparatus modifies, sorts, and packages different substances for secretion out of the cell, or for use within the cell.

3 0
2 years ago
What function do decomposers provide in a food web?They produce organic compounds in the presence of sunlight and chlorophyll.Th
andrey2020 [161]

Answer:

they specialize in hunting and eating live primary consumers

because in a food web predator eat the prey and the prey eat the predator

4 0
2 years ago
What would happen if our lungs where made up of only one big alveoli?
Dimas [21]

The process of respiration system would not function well if the lungs was made up of only one big alveoli.

<u>Explanation:</u>

The main role of alveoli is to help the lungs to breath, for ventilation, diffusion and perfusion. The process of respiration system would not function well if the lungs was made up of only one big alveoli.

Alveoli are tiny to help the flow of oxygen and carbon dioxide, it helps the oxygen flow into the lungs and remove the carbon dioxide. If the alveoli is just one and big, then it would be hard to flow the oxygen through lungs and remove the carbon dioxide.

Therefore, it is good to have many tiny alveoli than one big one or the rib cage  that protect the lungs could go through some damages.

7 0
3 years ago
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