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gogolik [260]
3 years ago
11

Urey and Miller's experimental setup was able to produce all twenty of the amino acids found in proteins. Some amino acids conta

in the element oxygen. Which starting material in the Urey-Miller experiment was the source of this element?
Biology
1 answer:
ololo11 [35]3 years ago
6 0

Answer:

The source of the oxygen in amino acids was water (H2O).

Explanation:

The Miller-Urey experiment was a chemical experiment in which the hypothetical conditions present on the early Earth were simulated. This experiment was conducted in order to test what kind of environment would be needed to allow life to begin. The experiment is considered to be the classic experiment on the origin of life. It was conducted in 1953 by two scientists; Stanley L. Miller and Harold C. Urey.

In this experiment Miller and Urey placed water (H2O), methane (CH4), ammonia (NH3) and hydrogen (H2) into an enclosed  chamber. The chamber was set up to mimic the atmosphere of the early Earth, with a reducing environment and high amounts of energy (lightning storms and high temperatures). At the end of the experiment Miller and Urey observed the spontaneous synthesis of amino acids, life-essential compounds, and concluded that organic molecules needed for life could be formed from inorganic components.

Starting materials used in this experiment served as a source of different elements needed for synthesis of amino acids. The source of the element oxygen in amino acids was water (H2O) that was put inside the chamber.

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Use the picture to tell if it is accurate , precise , or both?
Anton [14]

Answer:

Accurate - Yes

Precise - Yes

Explanation:

Accuracy and precision are two ways to detect the closeness of measured values in an experiment. However, these two terms do not mean the same thing.

Accuracy of a measurement refers to how close a measurement (experimental values) is to a true or actual value while the precision of a measurement refers to how close the experimental or measured values are to one another.

Note that, a measurement may be accurate but not precise or be precise but not accurate.

In the case of the dart board in the image, it is evident that the measured values (represented by darts) are close to the middle target (represents the known or accepted mark). Hence, the measurements are said to be ACCURATE. Likewise, the measured values are also close to one another, meaning that they are PRECISE.

Therefore, the measurements are both precise and accurate.

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4 years ago
What is the stage of mitosis where the chromatids pull apart?
castortr0y [4]

During anaphase, the sister chromatids are separated and pulled apart

7 0
3 years ago
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zavuch27 [327]
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In this activity, you’ll research a threatened ecosystem, the factors that are contributing to its decline in biodiversity, and
chubhunter [2.5K]

Answer:

forest ecosystem is whereby the organism live together and interact with each other and their environment. The biodiversity in this ecosystem is reducing due to the following factors:

1. deforestation: if most of the trees in the forest are been cut down without replacement it will affect the animal living there. especially herbivores, they feed on this plant and use it as a hideout.

2. bush burning: if the bush is burnt it may lead the animals to ran away for there safety and some may die of hunger, and some trees and plants may also become weak and die therefore reducing food for other animals.

3. Climate change: Climate change is one of the reasons. As deforestation may lead to climate change and many other factors, Without transpiration and evaporation cloud won't be form and there will be no rain which may lead to draught and finally animal will die and others will migrate.

possible solution to this

1. Avoid deforestation, and bush and plant more trees.

2. the government can also make laws concerning deforestation, bush burning, burning of fosil fuels and tires to avoid climate change.

5 0
3 years ago
Global air circulation cells move air _____.
tino4ka555 [31]

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<u>Answer:</u> Option B

<u>Explanation:</u>

Global circulation is defined as the global connection of winds, through which the requisite heat transport  from tropical latitudes to polar latitudes carried out. Each hemisphere comprises with three cells, such as Hadley, Ferrel and Polar cell, air circulation take place in this through the complete depth of the troposphere.

The worldwide circulation cells allow passage of air in clockwise pattern in the northern hemisphere while in southern hemisphere circulate in counter-clockwise pattern from equator to poles but in different directions and at different latitudes.

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