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Ksju [112]
3 years ago
15

PLEASE HELP, IM GIVING BRAINLEIST!!!

Biology
1 answer:
mina [271]3 years ago
8 0

Answer:

A

Explanation:

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Some have speculated that the origin of life occurred at geothermal vents. amino acids can form there. compared to the amino aci
cluponka [151]

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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2 years ago
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STatiana [176]

Answer:

Is this USA Test prep?

I believe that it is all except the 2nd one

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3 years ago
Regions of fetal cartilage that ossify into bone tissue prior to birth are called
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Which structure contains a cell nucleus
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The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.

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Explain in your own words the order in which the creature's features may have evolve, starting from the first likely trait (Hint
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The external cell membrane. Even organisms as simple as bacteria have a cell membrane.

Prokaryotes do not have internal membranes but they still have external membranes.

Everything living thing has a cell membrane
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