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2 years ago

Atoms have no electric charge because they

2 answers:

6 0

I think it because they both have the same equal molecules but atoms still doesn't have enough molecules or protons than what electric charge have

valentina_108 [34]2 years ago

5 0

They have an equal number of protons (positive charge) and electrons (negative charge)

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Number the steps of the binary fission process in the correct order. . Step 1 Cell wall or membrane forms. 2. Step 2 Cell grows

vampirchik [111]

The answer is:
Step 1 Genetic material duplicates.
Step 2 Cell grows in size and other organelles duplicate.
Step 3 Cell wall or membrane forms.
Step 4 Cells separate.

Binary fission is a type of cell division characteristic for prokaryotic cells. In this process, after the cell reaches its maximum size, the genetic material starts to duplicate. These two copies of genetic material are now connected to plasma membrane. The cell begins to grow in size and thus separate those two copies of genetic material. Other organelles are duplicated, too. Next, a new cell wall or cell membrane starts to grow in the middle of the cell leading to the separation of the cell.

8 0

3 years ago

Read 2 more answers

In a fixed volume when temperature increases , pressure does what?

Leni [432]

Answer:

When the volume is constant the pressure increases with temperature. 

Explanation:

Gay Lussac’s law precisely explains the relation between pressure and temperature of a system which has constant volume. In a system which has constant volume an increase in temperature indicates increase in temperature as well.

The reason behind the observation of this trend is the change in randomness of particles of the system. 

With increase in temperature the particle movement becomes random and fast. The particles hit the container walls at an increased rate and the pressure of the system increase. 

3 0

3 years ago

Which of the following best explains why deforestation increases the risk of floods in an area?a. Tree leaves catch and retain r

Illusion [34]

Answer: D) Tree roots improve soil water retention

There are many reasons which states that deforestation increases the risk of flood. First , some water stay on the leaves and evaporates in to the atmosphere. Second, tree leaves reduce the impact of raindrops on the soil which causes less soil erosion.

Third, tree roots absorb water from the soil, which make the soil dry and it absorb more water rainwater. The roots of tree hold the soil in place and reduce the movement of sediment which reduce the capacity of river to break its banking. Thus, reducing the chances of flood.

7 0

3 years ago

Read 2 more answers

Myasthenia gravis is an autoimmune disease in which the immune system gradually destroys the receptors for acetylcholine at the

Alex

<h2>A drug that inhibits acetylcholinesterase.</h2>

Explanation:

Acetylcholine esterase (AChE) inhibitors are viewed as the essential treatment of Myasthenia Gravis (MG).

Edrophonium is basically utilized as an analytic apparatus inferable from its short half-life. Pyridostigmine is utilized for long- time support.

High dosages of corticosteroids regularly are utilized to stifle autoimmunity. Patients with MG additionally might be consuming other immunosuppressive medications (eg, cyclosporine or azathioprine).

7 0

2 years ago

A gene is involved in promoting limb development in humans. The gene is initially weakly activated during the limb induction pha

Anna [14]

Answer:

1. If the gene is weakly activated, it likely lacks repressive histone modifications, but may also lack the presence of histone marks associated with strong transcriptional activation such as acetylation.

When the gene is strongly activated, it likely lacks repressive marks (such as H3K9me2/3 and H3K27me3 - both examples of repressive histone methylation) and might possess some activating histone acetylation marks, such as H3K4ac, and active histone methylation such as H3K4me3

An aside: The pattern and presence of different histone modifications would depend on the gene, but based on the fact that it is a developmental gene, I would assume that H3K27me3 and H3K4me3 are at play (these are part of the Polycomb/Trithorax system)

After limb growth is complete, the gene is turned off. Repressive histone methylation marks would be associated with this state, such as the aforementioned H3K9me2/3 or H3K27me3.

2. Histone modifications are tightly linked to genome organisation. Histone methylation marks associated with repression such as H3K27me3 and H3K9me3 are associated with compact chromatin structures, which restrict the access of transcriptional machinery and other positive regulators. Conversely, histone marks associated with gene activation are associated with a more permissive chromatin environment that facilitates the binding of factors associated with gene expression. In the case of histone acetylation, the acetyl mark directly removes the positive charge of chromatin, relaxing its interaction with negatively charged DNA.

3. If the inappropriate activation of this gene caused a cancerous tumor, this gene would be referred to as an oncogene (or a proto-oncogene for the term before it is inappropriately activated).

Typically, there are two classes of genes that lead to cancer: tumor-suppressor genes and oncogenes. Tumor suppressor genes lead to cancer when their protective activity is reduced or demolished, leading to the production of cancer cells. Oncogenes lead to cancer when they become over active. Oncogenes are often genes associated positively with growth and proliferation, consistent with the gene in this example.

8 0

3 years ago