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ArbitrLikvidat [17]
3 years ago
10

Before viewing prepared slides under a microscope, students should review the safety rules for

Biology
2 answers:
elixir [45]3 years ago
7 0
<span>In every laboratory that uses it for experimentation, it is very important that users of the laboratory must be oriented about their safety and the code of the laboratory. For one, it will allow you to be alert at all times when using for example, an unknown chemical. Two, it will help you understand how to use the apparatus present inside the laboratory. Three it will protect you against unforeseen events. So before viewing prepared slides under a microscope, the students should review the safety rules if there are accidents such as; cutting yourself from the prepared slide, informing the professor if the prepared slide is broken, asking the laboratory-in-charge for assistance on how to use the microscope. That way, the flow of the class will run smoothly.</span>
ExtremeBDS [4]3 years ago
4 0

the answer is C on E2020

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1) How is DNA condensed to form a chromosome?
Bumek [7]

Answer:

1) DNA is wrapped around histone proteins to form chromatin

2) The genes are the functional units, the segments between them are used for regulation

3) The genetic code is the language used, gene expression is how the cell uses the information, the activity of the genes.

Explanation:

1) DNA forms a DNA/protein complex called chromatin. It does this by wrapping around histone proteins. These histone proteins are usually present in the form of a nucleosome, which is a unit containing 2 copies of 4 histones (H2A, H2B, H3 and H4). The chromatin fibre at its most compact forms tightly coiled structures called chromosomes. These structures are only present during cell division. When the cell is in interphase (i.e. not dividing), the chromatin is not as tightly condensed, and instead the chromatin is more relaxed to allow the genes within to be expressed.

2) Genes are the functional units that the cell uses to make RNA and protein. The genes are first transcribed into RNA, which is processed and then translated into a polypeptide chain, which forms a complete protein that performs activities in the cell/tissue/organism. However, the whole genome does not form genes, there are regions that do not correspond to a gene. These regions are called "non-coding DNA" or sometimes even "junk DNA". However, that does not mean that these regions do not have important roles. The role of this DNA is usually in regulating the activity of the nearby genes. This DNA might contain important regulatory sequences such as promoters/enhancers/silencers that control how the gene is used by the cell, by for example, recruiting transcription factors or silencing proteins.

3) The genetic code is the language used by the cell. It explains how the cell can transcribe the information in the DNA, to RNA, process the RNA, and then translate the RNA into a polypeptide, and eventually a mature protein. In contrast, gene expression represents how the cell actually uses this information. Not all the genes are transcribed at the same time, instead, the activity of genes is carefully controlled to produce appropriate gene expression patterns, allowing the cell to properly perform its functions. Gene expression is hugely different between cells in an organism, for example the gene expression patterns of a muscle cell will  be hugely different to that of a blood cell.

5 0
3 years ago
What would be the magnification of a specimen viewed with a compound light microscope that has an objective power of 100x and an
Whitepunk [10]

Therefore, a 10x eyepiece used with a 40X objective lens, will produce a magnification of 400X. The naked eye can now view the specimen at a magnification 400 times greater and so microscopic details are revealed. More on objective lenses here. Magnification is the ability to view an object as larger.

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3 years ago
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The answer is D. Hope I could help
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3 years ago
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Reika [66]
I apologize in advance if this is incorrect but what I was taught is that the correct answer is gather data to design a recovery plan.
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3 years ago
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How do food webs show the flow of energy?
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Food webs normally start at the bottom and work their way up. Like the plants will be at the bottom, and then each level shows the animals getting bigger while losing energy. You continually lose energy as you work your way up an ecosystem, so normally there are only three or four levels. I hope this helps!
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