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3 years ago

What structure, still found in cells today, was key in causing a change from chemical evolution to biological evolution?

Biology

1 answer:

PtichkaEL [24]3 years ago

5 0

Answer:

Prokaryotic cells (bacteria) lack a nuclear envelope; eukaryotic cells have a nucleus in which evolution was thus reached in the early 1980s, when it was discovered an early stage of chemical evolution is thought to have been based on chloroplasts are still encoded by the organelle genomes.

Explanation:

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What is true about all neurons?

marin [14]

Answer:

im not suuuuureeeeeeeee but i think its a

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2 years ago

Choose the true statement(s) that support(s) the endosymbiotic theory. To be marked correct, you'll need to select all true stat

horsena [70]

Answer:

a.Many mitochondrial genes resemble proteobacteria genes, while the genes in the chloroplast resemble genes found in some photosynthetic bacteria.

c.Mitochondria and chloroplasts both have their own circular DNA and 70S ribosomes that are similar to those found in bacteria.

d.Mitochondria and chloroplasts replicate by a process similar to mitosis.

Explanation:

Endosymbiotic theory states that mitochondria and chloroplast which are organelles of eukaryotic cells were once independently living micro-organisms but with due course of time eukaryotic cells engulfed them and they become an integral part of these eukaryotic cells.

The resemblance between mitochondrial genes with those of proteobacteria and chloroplast genes with photosynthetic bacteria strongly support endosymbiotic theory. Apart from this, the presence of their own DNA that too circular just like prokaryotic microbes and 70 S ribosomes also support this theory. Also just like prokaryotic cells, before cell division mitochondria and chloroplasts undergo replication by means of a process known as binary fission.

3 0

3 years ago

A population of wild-flowers was scored for flower color. There were 302 blue (BB) plants, 1857 violet (BR) plants and 811 red (

Paul [167]

Answer:

frequency of the blue (B) allele $= 0.4142$

frequency of the red (R) allele $= 0.5858$

The number of blue plants expected is $509.652$

The number of red plants expected is $1019.304$

The anticipated number of violet plants is $1441.341$

Calculated chi square value

$= 84.5320 + 42.5688 + 119.8692\\= 246.97$

Explanation:

Frequency of blue allele is

Frequency of blue allele is equal to sum of frequency of BB and half of frequency of BR

$\frac{302}{2970} + \frac{1}{2} \frac{1857}{2970} \\= 0.1016 + 0.3126\\= 0.4142$

Frequency of other allele

$1- 0.4142\\= 0.5858$

Chi Square test

See the attached file

The number of blue plants expected is $509.652$

The number of red plants expected is $1019.304$

The anticipated number of violet plants is $1441.341$

Calculated chi square value

$= 84.5320 + 42.5688 + 119.8692\\= 246.97$

7 0

3 years ago

Why is DNA replication such an important process?

azamat

It is important because it creates a second copy of DNA that must go into one of the two daughter's cells when a cell divides

8 0

3 years ago

Read 2 more answers

Which of the following statements is true of cytokinesis? a. takes place in plant cells only b. completes the cell cycle c. orga

ICE Princess25 [194]

Hey there!

We are going to find out and learn which of the of the following options would match the word $\boxed{cytokinesis}$

One thing about the cytokineses is that they always finish there cell cycle.

So, based from the information, your correct answer would be completes the cell cycle.

<span> A. takes place in plant cells only

B. completes the cell cycle

C. organizes DNA

D. occurs during </span>pro phase

Your correct answer is $\boxed{\boxed{completes \ the \ cell \ cycle}}$

Hope this helps.
~Jurgen

4 0

3 years ago