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3 years ago

How does the digestive system absorb nutrients into the body?

1 answer:

8 0

Answer:The muscles of the small intestine mix food with digestive juices from the pancreas, liver, and intestine, and push the mixture forward for further digestion. The walls of the small intestine absorb water and the digested nutrients into your bloodstream.

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Which carbon(s) on the sugar is(are) in dna is used to make the phosphate ester linkages? g?

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Both the 3’ carbon and 5’ carbon act in forming the phosphodiester linkages.

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2 years ago

Cases in which hair, bones, and teeth are the only evidence retrieved/available from a crime scene are particularly well suited

lidiya [134]

Cases in which hair, bones, and teeth are the only evidence retrieved/available from a crime scene are particularly well suited to mDNA(mitochondrial DNA) is comparison and analysis is true.

Explanation:

The mtDNA is used to analyse a variety of samples such as bones, teeth and hair. It is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form of cells.

The trace DNA is a forensic method used for analysing DNA left at the scene of a crime. All the evidence from the scene are sent to the forensic laboratory for analysis. It processes all pieces of evidence from the scene. Once the reults are ready then there will be lead in the detective case.

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3 years ago

What is the stamen of a flower

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The stamen of a flower is the pollen-producing reproductive organ in a flower. (found at the bud)

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3 years ago

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Plants are autotrophs because they can prepare their own food. Photosynthesis takes place in leaves. Leaves contain that allow f

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Answer:

Plants are autotrophs because they can prepare their own food. Photosynthesis takes place in leaves. Leaves contain stomata that allow for the exchange of gases during the process, and also help with the process of transpiration.

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2 years ago

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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2 years ago