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Tasya [4]
3 years ago
11

In place of thymine, what does RNA use as a base Please help

Biology
1 answer:
11111nata11111 [884]3 years ago
7 0
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.
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Which wold tell you for sure if you had a sample of real gold​
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To perform this test to check if gold is real, make a light, tiny scratch on the item using a small nail file. Choose a spot that is not noticeable if possible. Use a dropper to apply a small drop of nitric acid to the scratch. If there is no reaction, then the piece is probably made from real gold.

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Which type of process occurred in the ecosystem that was affected by the 1988 fires in Yellowstone Park, which destroyed most of
Liono4ka [1.6K]

The correct answer is B. Secondary succession

Explanation:

In ecosystems, secondary succession occurs as certain events such as fires cause vegetation to temporarily disappear from one area. However, as soil is not affected negatively, vegetation grows again after some time, which means there is a secondary growth of vegetation and changes in the structure of an ecological community.

This term applies to the situation in the 1988 fires in Yellowstone Park because the fire destroyed the vegetation in the zone temporarily, but as the soil was intact after years or decades the vegetation will grow again, although this might implied changes in the ecosystem.

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The process by which organisms that are better adapted to the environment survive and reproduce is called ?
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Carbon dioxide gas.
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Describe one observation that supports the theory that mitochondria and chloroplasts originated as independent prokaryotic organ
olga nikolaevna [1]

Answer:

  • Both organelles present their genetic material.
  • Both organelles divide by binary fission
  • Both organelles present a double membrane, the internal one looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
  • In the internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
  • The sizes of the organelles are similar to the size of some procaryotes

Explanation:

The endosymbiotic theory essentially states that some organules of the eukaryotic cells, such as mitochondria and chloroplasts, were once free-living bacteria. Probably, these organisms must have been phagocytized but not digested by another cell. These bacteria were able to adapt to their host, establishing a bond of dependence among each other.

Both organelles have many similarities with other free-living bacteria. For this reason, the theory states that chloroplasts derivate from cyanobacteria (because they both absorb sunlight, store the energy in ATP, and produce organic molecules) and that mitochondria derivate from rickettsias (because they produce ATP in the same way, by using the Krebs Cycle and Oxidative Phosphorylation).

This theory is supported by a few characteristics of the chloroplasts and mitochondria that suggest that they once were free cells. For example,

  • Both organelles present their genetic material. This DNI is independent of the cells´ DNA, is bi-catenary and circular, identical to the bacterial DNA, and very different from the one of the eukaryotic cells.
  • Both organelles divide by binary fission, not by mitosis, and can synthesize their ribosomes and organelles.
  • Both organelles present a double membrane, a characteristic that reinforces the idea of being phagocyted. The internal membrane looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
  • In fact, in this internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
  • Finally, the sizes of the organelles are similar to the size of some procaryotes

3 0
3 years ago
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