Answer:
All of these choices are correct.
Explanation:
Cell cycle is the process of growth and division of cell. It comprises of interphase and mitosis. In interphase the cell grows, replicates its genomic content and prepares itself for division. In mitosis the division occurs.
Cell cycle is controlled by a group of kinases called as Cyclin dependent Kinases (CDKs). They act by phosphorylating their substrates. They are of various types like Cdk1, Cdk2, Cdk4 etc. They become active when they bind to a regulatory protein called cyclin. They are also of various types like Cyclin A, Cyclin B, Cyclin C etc. Level of cyclin and corresponding CDK increases and decreases according to the stage of cell cycle. For example in S phase of cell cycle concentration of cyclin A and E shoots up. CDK2 is able to bind to these cyclin molecules and hence it becomes active.
Cell cycle has major checkpoints where the condition of cell is analysed before it proceeds to the next stage of cycle. If any abnormality is detected, repair mechanism is activated or the cell is killed. Checkpoints do not allow cell cycle to proceed in damaged cells.
p53 is a tumor suppressor protein which can halt cell cycle when it detects some abnormality in cell. It usually acts in G1/S checkpoint (before the DNA replication starts in cell) and G2/M checkpoint (before the cell division begins). Hence, all of the above statements are true.
The United States Constitution is the world's longest continually operating written charter of governance. It was prepared in 1787, adopted in 1788, and entered into force in 1789.
The first three words of it, "We The People," indicate that the American government's goal is to serve its people.
<h3>What form of government evolved in the aftermath of the American Revolution?</h3>
The powers of the national government were specified in the Articles of Confederation following the United States' declaration of independence from Great Britain.
In order for the Constitution to be ratified by all 13 states, the participants in the Constitutional Amendment had to reach a number of agreements.
Thomas Jefferson authored the Declaration of Independence in 17 days. On July 2, 1776, Congress resolved to secede from the United Kingdom. On July 4, 1776, Congress approved the Declaration of Independence, which became known as Independence Day.
Learn more about United States Constitution refer
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The main function of environmental policy is to <u>reduce human impact on the environment (B).
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<h3>Further explanation
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Humans impact the environment in so many ways such as overpopulation, overfishing, pollution, and deforestation. This condition leads to many other problems: poor air and water quality, climate change, and soil erosion. Increasing population means increasing demand for consumption that may destroy the natural resources and environment.
The government or an organization creates environmental policies to regulate environmental issues and to reduce human impact on the environment. According to McCormick environmental policy is “any action deliberately taken to manage human activities to prevent, reduce, or mitigate harmful effects on nature and natural resources, and ensuring that man-made changes to the environment do not have harmful effects on humans or the environment.”
The policy regulates the use of resources and to reduce pollution to promote human welfare and protect natural resources. Some example of environmental policy, governments forbade the use of hazardous substances in agriculture or apply maximum emission levels for the industry to ensure minimum environmental quality.
<h3>Learn more
</h3>
A possible future milestone in environmental policy brainly.com/question/6839137
Turning points in environmental policy brainly.com/question/330708
Most important consideration for environmental policy brainly.com/question/1658665
Keywords: environmental policy, human impact on the environment, the function of environmental policy
Well considering birds follow humane rules, their selection and environment around them being thriving could effect their songs in a positive way. While a bird with a low selection of environmental stuff around them would effect their songs in a bad way giving off a more down manner.
