Explain how the domain system has changed over the years

1 answer:

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<span>This classification system model was based on principles developed by Swedish scientist Carolus Linnaeus, whose hierarchical system groups organisms based on common physical characteristics. Taxonomy is a hierarchical system for classifying and identifying organisms. Carolus Linnaeus developed those principles in the 18th century. In 1990, Three-domain system was developed by Carl Woese, an American microbiologist and physicist. The three-domain system divides cellular life forms into archaea, bacteria, and eukaryote domains and each domain can be further divided into kingdoms, phyla, classes, and so forth so it changes every year...</span>

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If a DNA molecule is found to be composed of 35% thymine, what percentage of cytosine would be expected, and why?

-Dominant- [34]

We use Chargaff's rule to get the answer. [A] + [G] = [C]+ [T]. [A] + [G] + [C] + [T] = 100% Where is A is Adenine, G is Gaunine, T is Thymine and C is Cytosine. In DNA, Adenine always pairs with Thymine, and Guanine always pairs with Cytosine. Therefore if Thymine is 35%, then Adenine will also be 35% to make 70% in total. The remaining percentage will be 100% - 70% = 30%. The 30% will be shared equally among Cytosine and Guanine, at 15% each. Therefore Cytosine will be 15%

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Axons of A alpha neurons conduct action potentials faster than any other type of neuron. Which of the following would account fo

never [62]

Answer:

Thick diameter, Myelinated

Explanation:

A alpha neurons conduct action potentials faster because of their large axon diameter and myelin.

The large diameter is less resistant to the flow of ions and allows for faster conductivity.
The myelin sheath is a layer of fat acting as to insulate the axon which helps increase signal conductance.

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Describe one example of weathering at a large scale and one example of weathering at a microscopic scale

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Answer:

Water, wind, and ice can also move pieces of rock or land to new places. The wearing away of a surface of rock or soil is called weathering.

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Meselson and Stahl's experiments proved that DNA replicates by which mode?

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Answer:

Semi-conservative

Explanation:

Meselson–Stahl experiment proved that DNA replication is a semiconservative process, feeding E. colo bacteria with different types of Nitrogen isotopes (N14 and N15).

Changing the type of radioactive compound in different times of bacteria grow, they could observe that both of the isotopes were present on the bacteria culture.

Basically, if the bacteria present both of them, the DNA was replicated semiconcervely.

Guess what? they show both! (See the image for more information)

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