What does transformation mean in biology?

1 answer:

7 0

Transformation is the genetic alteration of a cell resulting from the direct uptake of incorporation of exogenous genetic material from its surrounding through the cell membrane.

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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their e

cricket20 [7]

Answer:

The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.

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3 years ago

Analyze the oxygen levels of the victims. Were the levels higher or lower than normal? How can you reconcile this observation wi

fredd [130]

Answer:

In the case study of the Chicago cyanide murder, the oxygen levels were very low which lead to the death of the cells in the body (there would be signs of dead cells in the victims' bodies).

Explanation:

The mitochondrion is the powerhouse of all cells in the animal body, it is responsible for cellular respiration and production of adenosine triphosphate or ATP.

When the cyanide stops the activities of the mitochondrion, each cell in the body begins to die as a result of hypoxia, which is a condition where the body or a part of the body is deprived of oxygen.

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3 years ago

Basaltic magma is very fluid. What type of volcano and eruption would basaltic magma most likely produce?

Dmitry_Shevchenko [17]

The right option is; C. cinder cone, a pyroclastic flow with no explosion

Basaltic magma is a fluid rock material produced from basalt and it has high amounts of iron and magnesium, and low amounts of silica. Basaltic magma is formed within the earth when a part of the earth's mantle is melted. Basaltic magma produces three different types of lava or volcanic deposits which are scoria, ash or cinder, and lava flows.

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3 years ago

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Is it true that a deficiency of a trace mineral is just as damaging to your health as a deficiency of a major mineral?

Hatshy [7]

Yes as both play a vital role in your body

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3 years ago

Which of these sentences demonstrates the noun-verb-adverb pattern?

valina [46]

Answer:

Explanation: