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avanturin [10]
3 years ago
8

A sealed Ecosphere is able to perpetually sustain life until what happens? A. Oxygen is depleted. B. The producers use up all th

e carbon dioxide (CO2). C. Energy makes it to the highest trophic level. D. Necessary minerals become locked in deposits.
Biology
2 answers:
polet [3.4K]3 years ago
6 0

Answer:

A  oxygen is depleted

Explanation:

i just took the quiz

DiKsa [7]3 years ago
6 0

Answer:

D. Oxygen is DEPLETED

Explanation:

iT NEEDS OXYEN TO SUSTAIN IN A CLOSED ENVIRONMENT

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Explain how a dinosaur fossil is formed.
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The most common process of fossilization happens when an animal is buried by sediment, such as sand or silt, shortly after it dies. Its bones are protected from rotting by layers of sediment. As its body decomposes all the fleshy parts wear away and only the hard parts, like bones, teeth, and horns, are left behind.
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Sketch a replication fork of bacterial DNA in which one strand is being replicated discontinuously and the other is being replic
svet-max [94.6K]

Answer:

DNA Helicase is the enzyme that unwinds the double-stranded DNA into two single strands forming a replication fork.

DNA topoisomerase II or Gyrase is the enzyme responsible for relieving or relaxing the topological stress caused by the unwinding of DNA double strands.

DNA polymerase III is the primary replication enzyme. It is responsible for adding deoxyribonucleotides to the RNA primer both in the continuous or leading strand synthesis as well as in the discontinuous or lagging strand synthesis of DNA.

Primase is the enzyme responsible for the synthesis of the RNA primer (a short segment of RNA) to which deoxyribonucleotides are added.

DNA polymerase I is responsible removing and replacing the RNA primers with DNA in the newly DNA strands.

DNA Ligase is the enzyme responsible for sealing the gaps in the DNA due to broken phosphodiester bonds after the removal of the RNA primer.

Explanation:

The sketch of the replication fork of bacterial DNA showing where one strand is being replicated discontinuously and the other is being replicated continuously, as well as the different enzymes involved and their location of activity is found in the attachment below.

DNA replication occurs in the 5' to 3' direction by DNinA polymerases.

Continous DNA replication occurs in same direction as the direction as the replication fork, in the 5' to 3' direction.

The discontinuous replication occurs in fragments of DNA known as Okazaki fragments which are then ligated by DNA ligase.

3 0
3 years ago
A _ is a combination of substances that are combined physically but not chemically.
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Chemical<span> Mixtures. A mixture is a material system made up of two or more different</span>substances<span>, which are mixed </span>but not combined chemically<span>. A mixture refers to the physical </span>combination<span> of two or more </span>substances<span> in which the identities of the individual </span>substances<span> are retained.</span>
8 0
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Answer:

See explanation below.

Explanation:

The star that is nearest to our solar system is Proxima Centauri. It is about 4.22 light years away. That means if you travel at the speed of light, it will take you 4.22 years to travel from here to there.

Hope this helps! Have an Awesome Day!! :-)

6 0
3 years ago
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