Most eukaryotic cells contain mitochondria, but a few single-celled eukaryotic organisms found in oxygen-free environments do not. which of the observations led biologists to reject the hypothesis that these mitochondria-free eukaryotes evolved before the endosymbiotic event that established mitochondria in other eukaryotes?

Answers

Question 1: the right answer is B.


The cell is the smallest basic structural and functional unit of all living things. There is a wide variety of living cells that differ in size, shape, function, behavior, and association, but they all describe the same basic model.


Question 2: the right answer is C.
The scientist made a mistake when it classifies it as a prokaryotic cell.

In a general sense, the term eukaryotic refers to all unicellular or multicellular organisms whose cells are called "eukaryotic". They have a nucleus and organelles (endoplasmic reticulum, Golgi apparatus, various plastids, mitochondria, etc.) delimited by membranes.

Eukaryotes are distinguished from prokaryotes (such as bacteria) which, for their part, are devoid of these structures. But what really differentiates eukaryotes from prokaryotes is the presence or absence of a nucleus.


Question 3: The right answer is A.


In eukaryotic cells, the genetic material is organized into a complex structure of DNA and protein located in the nucleus. This structure has been called chromatin.


Question 4: The right answer is C.


Some organisms have evolved into complex methods to circumvent hypotonia. For example, salt water is hypertonic for the fish that live there. They need a large area for their gills to come into contact with seawater, to facilitate gas exchange, so they can lose water by osmosis to the sea from the cells of their gills.


Question 5: the right answer is B.


The emission of a molecule of O2 requires the oxidation of 2 molecules of H2O; there are 4 electrons transferred.



2 H2O > O2 + 4 H + + 4 e-


Question 6: The right answer is D. None.


The carbon cycle is linked to photosynthesis. During photosynthesis, plants (that contains chlorophyll) turn carbon dioxide and water into carbohydrates (such as glucose), under the action of sunlight (away from the light that will not be able to happen).


Question 7: The right answer is B.


In the Calvin cycle, atmospheric CO2 is bound to organic compounds such as ribulose-1,5-bisphosphate. The formed compounds are then reduced and converted, for example, to glucose using NADPH and ATP formed as a result of the light-dependent reactions.


Question 8: The right answer is C.


The purpose of glycolysis is to provide molecules of pyruvates, which then go between oxidized to give acetyl CoA, which will enter the Krebs cycle, and generate electrons transporter such as FADH2 and NADH, H +, which will participate in the chain of electron transport.


Question 9: The right answer is D.


The degradation reaction of glucose to release ATP are as follows:



in aerobic environment: C6H12O6 + 6O2 → 6CO2 + 6H2O + 36 ATP + heat



in anaerobic environment: C6H12O6 → CO2 + organic residue + 2 ATP + heat


Question 10: The right answer is D. Glucose


Glucose (from grapes) is the source of carbon to produce wine by turning it into ethanol.

Both mitochondria and chloroplasts have a circular DNA genome, like a bacteria's genome, but smaller.

Explanation:

The theory of endosymbiosis explains how eukaryotic cells might have risen from prokaryotic cells.

The evidence which supports this theory was the fact the organelles like mitochondria and chloroplast have their own DNA, which is like the prokaryotic DNA. It is circular and smaller. This DNA is also capable of making its own RNA.

This evidence supports the theory of endosymbiosis.

B) A cell cannot be subdivided into smaller units that maintain the living state. hopes this helps ;-;

Answe  b

Explanation:

A cell cannot be subdivided into smaller units that maintain the living state.

1. A cell cannot be subdivided into smaller units that maintain the living state- This is true.

2. The organism is a eukaryote, because it has a cell membrane, a cytoplasm, and DNA.

3. Nucleus, chromatin

4. Water would flow out of them because they are hypertonic to the external environment.

5. Because water provides electrons

6. None

7. ATP and NADPH

8. Glycolysis, pyruvate oxidation, Krebs cycle, electron transport.

9. Eighteen times more ATP is formed during aerobic respiration than during anaerobic respiration.

10. Glucose.

(B) Plant and animal cells both carry out aerobic respiration, producing ATP.

Explanation:

Aerobic cellular respiration occurs mainly in eukaryotic cells (Eukaryotic cells are cells that contain a nucleus and organelles, and are enclosed by a plasma membrane). The process of aerobic cellular respiration takes place mostly inside of the mitochondria, an organelle that is known as the powerhouse of the cell.

There are three main stages to get from food molecules to ATP (Adenosine triphosphate is a complex organic chemical that provides energy to drive many processes in living cells): glycolysis, the citric acid cycle, and the electron transport chain.

1. The statement that is true is: a cell cannot be subdivided into smaller units that maintain the living state.
2. The statement that would be the best response to the biologist's study would be that the organism is a eukaryote, because it has a cell membrane, a cytoplasm, and DNA.
3. If cells were placed in fresh water, it would have water flowing out of them because they are hypertonic. Therefore, C. would be the best choice.
1. A cell cannot be subdivided into smaller units that maintain the living state.
2. The organism is a eukaryote, because it has a cell membrane, a cytoplasm, and DNA.
3. nucleus, chromatin
4. The fluid in their cells is hypertonic with respect to the external environment and so they have to be able to pump water out.
5. provides electrons
6. none
7. ATP and NADPH
8. glycolysis, pyruvate oxidation, Krebs cycle, electron transport
9. Eighteen times more ATP is formed during aerobic respiration than during anaerobic respiration.
10. Glucose
1 since all cells carry out cellular respiration they contain mitochondria 

thats all i could see that were correct out of the info given 
is 2 incomplete 

Their nuclear genome contained relics of mitochondrial genes

Explanation:

Mitochondrion is a double membrane bound organelle that is found in most eukaryotic organism whose main function is to produce or generate energy. The mitochondria has DNA thus it is passed exclusively from mother to offspring.

It is hypothesized that it exists inside the cell after an endosymbiotic event                                            

Since their nuclear genome contains relics of mitochondrial genes, biologists rejected the hypothesis that they evolved before the endosymbiotic event.



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