Answer:
D.) repressor DNA-binding site mutation
Explanation:
lacl prevents the repressor polypeptide is a mutant that prevent operon from binding lactose, and thus will bind to the operator and be non-inducible.. This mutant will represses the lac operon whether lactose is present or not and the lac operon will not be expressed. It is also called“super-supperesor".
The lacI locus – One type of mutant allele of lacI (callled I-) prevents the production of a repressor polypeptide or produces a polypeptide that will not allow to bind to the operator sequence.
This is also a constitutive expresser of the lac operon because absence of repressor binding permits transcription.
The answer would be meiosis 2 because in this separation of sister chromatids occur which is similar if not identical to mitosis.
Answer:
Polygenic.
Explanation:
A trait that is controlled by more than one gene is called polygenic which translates to "multiple genes".
The small cells of bacteria that lack nuclei are termed as PROKARYOTIC CELLS.
Prokaryotic cells are the bacterial cells that do not have true nucleus. These cells contain genetic material naked in the cytoplasm and is referred as nucleoid that lacks a nuclear membrane.
Answer:
Growth of cell and replication of DNA.
Explanation:
The cell cycle has three stages, the interphase, mitosis, and the G0 phase.
Interphase is before mitosis, and it prepares the cell for its division. Interphase has three phases:
- G1, where the cell grows in size due to the growth of organelles and components, which the cell will need later.
- In the S phase, the cell synthesizes a copy of the DNA.
- The G2, where the cell keeps growing and producing organelles and other elements that will need for mitosis.
In conclusion, in the interphase, the cell grows and replicates its DNA.
