Sketch a replication fork of bacterial DNA in which one strand is being replicated discontinuously and the other is being replic
1 answer:
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.
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The food chain and food web are used to transfer energy. Plants, who are the primary energy providers in the ecosystem, use their chloroplasts to collect sunlight, which is then partially converted into chemical energy during photosynthesis.
a)
- When herbivores eat (are the primary consumers of) plants as food, this energy is transferred to the primary consumers in the food chain.
- This energy is stored in various organic products in plants. Then, the chemical energy contained in plant products is converted into kinetic energy, degrading the energy by turning it into heat. The secondary consumers come next.
- Further deterioration will occur when these herbivores are consumed by secondary consumers.
- Finally, energy will once more be destroyed when tertiary consumers eat the carnivores. As a result, the energy flow is only in one direction i.e., unidirectional.
b)
- Additionally, the energy flow in a food chain adheres to the 10% law.
- This law states that only 10% of energy is transferred from one trophic level to the next, with the remaining 90% being lost during the digestion process of the organism itself.
c)
- There are typically fewer organisms at the top of an energy pyramid because It has the least quantity of energy, the top level of an energy pyramid has the fewest organisms.
- Most ecosystems only have four trophic levels because there is eventually insufficient energy to maintain further trophic levels.
d)
- For instance, let us assume that a plant at the producer level produces 1000 Kcal of energy.
- When a primary producer eats this plant, it will only get 10% of the energy produced by the plant i.e., 1000/10 = 100 Kcal. the rest 90% will be used up by the plant itself for its metabolism.
- Further when a secondary consumer eats the primary consumer, it will only get 10% of the energy produced by the plant i.e., 100/10 = 10 Kcal.
- Lastly, as the tertiary consumer eats the secondary consumer, it will only get 10/10 = 1kcal.
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