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lesya [120]
4 years ago
14

Explain if an unknown substance found on a meteorite is determined to contain no trace of carbon, can scientists conclude that t

here is life at the meteorites origin
Biology
1 answer:
Svetach [21]4 years ago
5 0
All life as we know it is carbon-based, so what scientists could determine is that there is no carbon-based life at the origin of the meteorite. However, this does not necessarily mean that there is no life there; our knowledge is only based on our experiences of life on Earth, so it is possible that life has developed in other regions of space upon other elements and formations. For example, there could be life based on silicon or other chemical compositions. 
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What can you conclude about the importance of marine ecosystems to global food webs and the biospher
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3 years ago
Read 2 more answers
How could a substance that stops the synthesis of mRNA cause the liver to stop functioning
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4 0
4 years ago
When and how does the amount of DNA (c-content; where c
Savatey [412]

Answer:

G1 phase: 2C

S phase: 4C

G2 phase: 4C

Meiosis-I: 2C and Meiosis-II: C

Mitosis: 2C

Explanation:

Let's suppose that a cell with 2C DNA content enters the cell cycle. As the G1 cell with 2C content would enter the S phase, DNA replication would double the amount of DNA. Therefore, the cell by the end of the S phase and in the G2 phase would have 4C DNA.

If the G2 cell with 4C DNA enters meiosis-I, separation of homologous chromosomes to the opposite poles in anaphase-I would reduce the DNA content to 2C. Therefore, the cell by the end of anaphase-I would have 2C content. Meiosis-II would further reduce the DNA content in anaphase-II by separation of sister chromatids to opposite poles. Therefore, each of the four daughter cells formed by the end of meiosis would have C DNA content.

If the G2 cell with 4C DNA enters mitosis, separation of sister chromatids to opposite poles in anaphase would reduce the DNA content. Therefore, each of the two daughter cells formed by the end of mitosis would have 2C DNA content.

6 0
3 years ago
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