A. the lac repressor
B. the lac operator
C. the lac promoter
D. the lac locator
The correct answer is A. Lac repressor.
Lac repressor prevents lac gene which are found in the DNA of Escherichia Coli from being expressed for many times.
Lac repressor is termed as DNA which binds proteins. It allows the expression of genes from coding which are made for proteins to be involved in metabolism of lactose which is in bacteria.
When there is no lactose which is available in the cell, then the genes are being repressed. Lactose are being converted to allolactose if they are available.
The answer is letter C. Radon
One of the natural pollutants in ground water system is radon gas. Radon gasses are from the Uranium decay from the Earth’s crust and possibly enter the groundwater system. There is a big possibility that the water that enters our home from the groundwater system can be polluted.
Radon is a source of natural groundwater pollution (option B)
Radon is a naturally occurring radioactive gas that is colorless, odorless, and tasteless. It is formed from the decay of uranium, which is found in all rocks and soils. Radon can seep into homes and buildings through cracks and other openings in the foundation. It can also be found in groundwater.
Radon is a health hazard because it can cause lung cancer. When you breathe in radon, the radioactive particles can get trapped in your lungs. Over time, these particles can damage DNA and lead to cancer.
Learn about radon here brainly.com/question/31577197
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Answer:
The correct answer will be option-D
Explanation:
The cell cycle is the cyclically ordered sequence of events taking place in the cells associated with the division of the cell.
The cell cycle takes place in two phases: the interphase proceeded by M-Phase. The interphase of the cell cycle proceeds in G₁, S and G₂ phase. During the G₁ phase, the cell prepares itself to prepare for the next important phase marked by the synthesis or replication of the genetic component of the cell.
The changes that take place during the G₁ phase thus includes the increase in size and the production of ATP as DNA replication is an energy-dependent process.
Thus, Option-D is the correct answer.
Answer:
Explanation: just got it right on my USATESTPREP its LETTER D.
and water to all parts of the plant.
tissue helps transport