Correct answer: B). Cell growth
The Interphase is often referred to as a metabolic phase of the cell cycle because in this phase the cell obtains nutrients, read its DNA, conduct other cell functions. Most of the eukaryotic cell spend most of their time in interphase, it is also called as a resting phase.
The main purpose of interphase is to prepare and check the conditions in order to conduct the successful cell division. In this phase, the cell prepares itself for the division. In this phase, the cell organelles double in number and replication of DNA takes place, and the synthesis of protein, which is required for cell growth are made in this phase of cell growth.
Answer:
Explanation:
they are all based on observations
Answer:
The claim is valid because the lac operon allows a bacterial cell to shut down a metabolic pathway if it is not immediately needed.
Explanation:
The lac operon is a cluster of genes which contain the same promoter sequence and are transcribed as a single messenger RNA (mRNA). This operon is inducible because the presence of lactose in the cell influences its transcription. Lactose can bind to the repressor of this operon, leading to a conformation change in the repressor, thereby preventing the repressor from binding to the operator and thus allowing transcription of the structural genes. After lactose addition, the β- galactosidase enzyme can break this carbohydrate into glucose and galactose, thereby there is no lactose able to bind with the repressor and therefore this operon shuts down. During transcription, the promoter of the lac operon binds both RNA polymerase and catabolite activator protein (CAP) and cyclic AMP (cAMP) complex.
Answer:
d) topographical variation
Explanation:
