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notka56 [123]
3 years ago
14

Explain whether carbon 14 can be used to find the ages of rocks.

Biology
1 answer:
notka56 [123]3 years ago
8 0

Can carbon dating be used to identify the age of rocks or fossils?

Only organic fossils up to 70,000 years of age. Other isotope dating techniques must be used to find the age of older fossils and rocks.

How do scientist use fossils to to find out the age of rocks?

Usually it is rocks which determine the age of fossils, but if the fossils discovered are already of a known age, the age of the rock can be inferred

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Analyze the data about nitrogenous base content of DNA from various species. Percentages of Bases in Five Organisms Source of DN
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Answer:

When analyzing data on the nitrogenous base content of the DNA of various species, the claims are supported by the data:

  • <em>In any one species, the amount of adenine closely approximates that of thymine.  </em>
  • <em>In any one species, the amount of guanine closely approximates that of cytosine.  </em>
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<em>(options A, B and D)</em>

Explanation:

Organizing the data has to:

<u>Source of DNA      A            T            G            C </u>

Streptococcus    29.8       31.6        20.5       18.0

Yeast                   31.3        32.9       18.7         17.1

Herring                27.8       27.5       22.2       22.6

Human                30.9       29.4       19.9        19.8

E. Coli                  24.7       23.6        26.0      25.7

DNA is the molecule that contains the genetic information of each species, formed by sequences of nitrogenous bases Adenine, Thymine, Cytosine and Guanine.

Since Adenine and Thymine -as well as Cytosine and Guanina- are complementary, the percentage of them will be very similar in each DNA molecule.

The genetic information -which determines the physical and functional characteristics of each organism- is encoded in the DNA and is different for each species, so the percentages of nitrogenous bases vary from species to species.

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