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tangare [24]
2 years ago
13

Some have speculated that the origin of life occurred at geothermal vents. amino acids can form there. compared to the amino aci

ds used in living things, what is the problem with the amino acids formed near these vents?
Biology
1 answer:
cluponka [151]2 years ago
3 0

There are a number of amino acids that have formed under certain environmental conditions if the required elements are present and the energy conditions ar compatible with chemical assembly. These conditions have also allegedly formed amino acids on meteors, asteroids and comets.


But, amino acids are a very minor component of more complex biochemical assemblies required for life. Pentose sugars are also required, which form under different environmental conditions than amino acids. More importantly, only left-handed homochiral amino acids and right-handed homochiral sugars can form functioning biochemical assemblies that are viable in an organism. But, natural conditions, like hydrothermal vents only produce racemic versions of sugars and acids, meaning they are always approx. 50% left and right handed. This is fatal to forming viable biochemical assemblies.


Further, it is not possible for all of the 20+ homochiral amino acids needed for a living organism to form naturally. The only ones found have been the simpler amino acids. Also, the 4 critical nucleotide amino acids, C, G, A, T, do not form naturally, are not homochiral, nor in the right proportions.


The geo/hydrothermal vent conjecture is nonsensical. These are open systems, susceptible to currents, mineral contamination, salinity, ph, and temperature, making them a totally unacceptable environment for the precise and exact placement of elements to assemble to form life.

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In place of thymine, what does RNA use as a base <br><br> Please help
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The first three are the same as those found in DNA, but in RNA thymine is replaced by uracil as the base complementary to adenine. This base is also a pyrimidine and is very similar to thymine. Uracil is energetically less expensive to produce than thymine, which may account for its use in RNA.
7 0
2 years ago
In a particular plant, green seed color is dominant to yellow seed color. If a homozygous
Sergio039 [100]

Answer: 100% will be heterozygous green.

Explanation:

Since both parents (green and yellow) are homozygous and green is dominant, when they are crossed all the resultant offsprings will have both genes of green and yellow in their genotype but will appear as green( phenotype) because the green colour is dominant and has masked the yellow colour which is recessive.

8 0
3 years ago
Your 8-year-old cat ran away, got into a neighbor's cellar, and was stuck there for two months. Luckily, there was enough food a
Vlad1618 [11]

Answer:

The vision remains unaffected.

Explanation:

Rods and cones are two types of photo receptor cells present in the organism. Cone cell helps in the visualization of color whereas rod cells are involved in the light intensity.

The cat was stuck in the neighbor's cellar with enough food and water. The cat was stuck in the basement with pitch-black but this does not affect the vision of cat. Cats are nocturnal animals and has large amount of rod cells that enable them to see at night. Thus, her vision remains unaffected.

5 0
3 years ago
An aquifer is a rock layer that stores and allows the flow of groundwater. Compared to other types of rock layers, how permeable
AVprozaik [17]

Highly porous and permeable

Explanation:

Compared to other types of rock layers, an aquifer is highly porous and permeable.

Aquifers are always the target when prospecting for ground water in a formation.

  • Porosity is the amount of void spaces in a rock.
  • Aquifers are highly porous .
  • Permeability is the inter-connectivity of the void spaces and their ability to transmit fluids.
  • Aquifers have very high permeability compared to other rock types.

In terms of permeability and porosity, an aquifer is higher porous and permeable.

learn more:

Biogeochemical cycle brainly.com/question/3509510

#learnwithBrainly

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In order to beat, the heart needs three types of cells. describe the cells and their function.
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1. Rhythm generators (SA node)
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