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lapo4ka [179]
3 years ago
8

Replication in prokaryotes differs from replication in eukaryotes for which of the following reasons?

Biology
1 answer:
alekssr [168]3 years ago
8 0

The correct answer is: B) Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic chromosomes have many.  

The difference between prokaryotic and eukaryotic replication is due their complexity difference. Prokaryotic cell has no nucleus (replication takes place in the cell cytoplasm), or other organelles. Also, eukaryotic cell has much more DNA than a prokaryotic cell.

Difference in replication:

• Origin- In prokaryotes there is only one point of origin, and replication occurs in two opposing directions at the same time (eukaryotes have multiple points of origin and unidirectional replication)

• Enzyme polymerase-prokaryotes have two types of them, while eukaryotes have four

• Speed rate- faster rate in prokaryotic cells and happens continuously

• Telomeres-eukaryotic cells have them.

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3 years ago
Many mutations have been identified in the lac operon. A particular mutation in the CRP gene make the CRP protein bind to the Pl
maksim [4K]

Answer:

a. + glucose, + lactose  = On

b. - glucose, - lactose  = Off

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d. - glucose, + lactose = On

Explanation:

Lac operon has both types of control, repressible and inducible.

Whenever glucose level is low in the cell, an enzyme known as adenylyl cyclase raises the level of cAMP which forms a dimer with CRP protein and they both act as activator of lac operon and cause expression.

Apart from this, when lactose is present in the cell, β-galactosidase enzyme metabolizes lactose to form allolactose which causes allosteric repulsion in the lac repressor and causes its removal from the operator. As soon as repressor is removed lac operon gets activated.

In wild type lac operons, the expression of lac operon occurs when glucose level is low in the cell and lactose is present but in this mutant presence or absence of glucose will not make a difference because CRP will bind Plac promoter independent of cAMP level i.e. activator CRP will work even in high glucose concentration. If lactose is present then lac operon will always express so in option 'a & d' lac operon will express but in option 'b & c' it will not express.

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4 years ago
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Hopefully this helps!
3 0
3 years ago
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