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prisoha [69]
3 years ago
10

Many experiments on earths early atmosphere have resulted in formation of organic molecules but have never resulted in cell form

ation in which of the following ways do the experimental conditions prevent cell formation in the lab?
A. Ultraviolet light intensity of early earth cannot be reproduced
B. Gas combustion of early earth cannot be replicated
C. The nutrients earlier are different from those found today
D. The experiments cannot last for billions of years as it did on earlier
Biology
2 answers:
lubasha [3.4K]3 years ago
8 0
D) the expiraments cannot last billions of years as it did earlier on
swat323 years ago
8 0

Answer: Option D

Explanation:

The early earth conditions were different from the conditions that exists today. Too much of oxygen in the atmosphere hinders the formation of cells.

Many experiments were performed to form organic compounds but none of them helped to form cells.

This is because after the formation of organic molecule, it took time for the formation of cells. There is no such experiment that can be performed for such a longer duration of time, so cells cannot be formed.

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Answer:

b: 8;8

Explanation:

Mitotic or meiotic cell division constitute the m phase of the cell cycle. At the end of the m phase, the new cells enter the interphase stage of the cell cycle. The interphase is further sub-divided into;

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The G_0 phase is essentially a resting phase. Cells that do not need to divide except when necessary move into this phase after exiting the m phase.

Actively dividing cells enter the G_1 phase after exiting the m phase. Cell development and growth takes place. From there, the cells enter the S phase where DNA replication/synthesis takes place. The cells then enter the G_2 phase where proteins are synthesized in preparation for division or m phase.

At the S phase, the amount of DNA a cell carries is doubled but the chromosome number remains the same. For example, if a cell enters the S phase with 2 g of DNA containing 10 chromosomes, at the end of S phase, the amount of DNA would have come 4 g while the number of chromosomes will remain 10.

Hence, if the average amount of DNA in the assayed cells immediately after mitosis is 4 picograms, the amount would be 8 picograms at the end of S phase and will still remains 8 picograms at the end of G_2 phase.

The correct option is b.

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