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3 years ago

T / F Nitrogen is present in carbohydrates but not proteins.

1 answer:

6 0

False. Carbohydrates only contain the elements carbon, hydrogen, and oxygen. The building blocks of proteins, amino acids, contain—at the very least—carbon, hydrogen, oxygen, and nitrogen. Thus, nitrogen is not present in carbohydrates, but it is present in proteins, making the given statement false.

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The bones from an animal found at an archaeological dig have a C614 activity of 0.10 Bq per gram of carbon. The half-life of C61

erastova [34]

C14 is an isotope used in radiocarbon dating techniques to date organic matter remains. The age of these bones is approximately 6890 years.

<h3>What is Carbon 14?</h3>

Carbon 14, also known as radiocarbon, is a radioactive carbon isotope.

Isotopes are the atoms of the same element -carbon- that vary in neutrons and, hence, in their massic number. They are alternative forms of the same element.

The radioactive C14 nucleus contains 6 protons and 8 neutrons and has a half-life of 5730 years.

The term half-life is a reference. It means that an organism that has been dead for 5730 years has half the C14 amount or concentration than the same organism had when it was alive.

Knowing the half-life of an element is useful to determine the age of the dead matter.

C14 is used in radiocarbon dating techniques or methods to estimate the age of fossils. This is a reliable technique used for dating organic samples that are less than 50,000 years old.

Available data:

The half-life of C14 is 5730 years
Bones activity of 0.10 Bq per gram of carbon

To answer this question we can make use of the following equation

Ln (C14T₁/C14 T₀) = - λ T₁

Where,

C14 T₀ ⇒ Amount of carbon in a living body. We know, by bibliography, that living organism activity is 0.23 Bq per gram of carbon. So, C14 T₀ = 0.23 Bq/g

C14T₁ ⇒ Amount of carbon in the dead body. C14T₁ = 0.1 Bq/g

λ ⇒ radioactive decay constant = (Ln2)/T₀,₅

T₀,₅ ⇒ The half-life of carbon 14 = 5730 years

T₀ = Time when the organism was alive

T₁ = Age of bones

Let us first calculate the radioactive decay constant.

λ = (Ln2)/T₀,₅

λ = 0.693/5730

λ = 0.0001209

Now, let us calculate the first term in the equation

Ln (C14T₁/C14 T₀) = Ln (0.1/0.23) = Ln 0.4347 = - 0.833

Finally, let us replace the terms, clear the equation, and calculate the value of T₁.

Ln (C14T₁/C14 T₀) = - λ T₁

- 0.833 = - 0.0001209 x T₁

T₁ = - 0.833 / - 0.0001209

T₁ = 6889.99 ≅ 6890 years

The bones are approximately 6890 years.

You can learn more about dating organic matter with carbon14 at

brainly.com/question/4149380

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6 0

2 years ago

Like animals, plants must maintain and internal balace, or

igomit [66]

Like animals, plants must maintain an internal balance, or homeostasis.

Hope this helps chu

Have a great day

☆ Dont forget to mark brainliest ☆

3 0

3 years ago

These are carbohydrates -rich vegetables EXCEPT a. Tubers b. nuts c. seeds d.roots

Svetradugi [14.3K]

The answer is a. Tubers

3 0

3 years ago

Read 2 more answers

According to Sandel, when companies companies attempt to incentivize employees to quit smoking:__________

svlad2 [7]

Answer:

employees tend to return to smoking when the incentive ends

Explanation:

because employees love to smoke on breaks and they are addicted to smoking.

5 0

3 years ago

How are clouds and fog related to precipitation?

Dominik [7]

Answer and Explanation:

Both clouds and fog are closely related to precipitation.

This can be explained first by the formation of clouds and fog, which begin when the air contains water vapor. This water vapor is produced when there is an accumulation of moisture in the enviroment which leads to the formation of clouds. A similar process occurs with the formation of fog, which comes from saturation, that occurs after the evaporation and condensation processes that take place after precipitation (water cycle).

Moreover, some types of clouds (cumulonimbus) are associated with precipitation as they could be accompanied by climatic phenomenon such as rain and snow.

7 0

3 years ago