Proteins – elemental composition
what the structure of amino acids is;
that amino acids can be merged, creating peptides.
what elements are present in the proteins;
what the proteins are;
to indicate food products which contain proteins;
to specify the role of proteins in the body.
Elemental composition of proteins
How is the human body built?
The main components of the human body are water (approx. 65%) and proteins (approx. 20%).
What are proteins and what elements are they made of?
Before you watch the movie „Testing the elemental composition of proteins”, formulate research question and hypothesis.
Film dostępny na portalu epodreczniki.pl
Film pokazuje eksperyment. Problem badawczy: Jakie pierwiastki wchodzą w skład białek? Hipoteza: W skład białek wchodzą takie pierwiastki, jak: węgiel, wodór, tlen i azot. Będziesz potrzebował: białko jaja kurzego, uniwersalny papierek wskaźnikowy, probówka, palnik. Instrukcja: W probówce umieść białko jaja kurzego. Probówkę ogrzewaj. Do wylotu próbówki zbliż zwilżony papierek uniwersalny.
Which atom elements are present in protein molecules?
The protein molecules include atoms of elements such as: carbon, hydrogen, oxygen and nitrogen.
hen egg white,
NaOH (sodium hydrtoxide)
pipette
all‑purpose indicator paper,
test tube,
burner.
Place the egg white in the two test tubes.
Heat the frst test tube.
Observe the changes.
Add in the second test tube NaOH and heat.
Bring a moistened universal indicator closer to the outlet of the test tube.
Observations show that the following elements are included in the composition of proteins:
carbon (proteins were carbonized),
hydrogen (an element included in water),
nitrogen (the color of the indicator paper indicates alkaline pH - ammonia, contains a nitrogen atom).
ProteinsProteins are substances, the molecules of which are composed mainly of carbon, hydrogen, oxygen and nitrogen atoms.
Consider whether can proteins contain other elements? Remember the smell which is released during the process of spoilage of eggs.
The unpleasant smell of spoiled eggs is caused by the formation of hydrogen sulphide, a compound with the formula . Based on this, we can make a conclusion that proteins also contain sulfur. Some proteins also contain phosphor, less frequently copper, iron, zinc, magnesium and iodine.
Solve the crossword.
- An element with a mass number of 32
- The chemical compound necessary for all living organisms
- One of the chemical compounds, which demonstrates the presence of nitrogen during the examination of its elemental composition
- It surrounds the egg yolk
- A heavy metal which is in 14th group and has 125 neutrons in the atomic nucleus
- Vinegar is a dilute aqueous solution of acetic...
- An element which has two electron shells and 5 valence electrons
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Match the pairs: English words with Polish definition.
powstaje w wyniku połączenia się aminokwasów; tworzą je grupy karboksylowa i aminowa łączących się cząsteczek aminokwasów, wielkocząsteczkowe związki zbudowane z reszt aminokwasowych połączonych wiązaniami peptydowymi; w skład białek wchodzą głównie takie pierwiastki, jak: węgiel, wodór, tlen i azot
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| peptide binding |
Conclusion
Molecules of all proteins are composed mainly of atoms of four elements: carbon hydrogen, oxygen and nitrogen. Some proteins may contain atoms of sulfur, phosphor and other elements.
Proteins are substances, the molecules of which are composed mainly of carbon, hydrogen, oxygen and nitrogen atoms.
Keywords
protein, protein structure, elemental composition of proteins, sulfur, nitrogen, carbon, hydrogen, oxygen
Glossary
białka – wielkocząsteczkowe związki zbudowane z reszt aminokwasowych połączonych wiązaniami peptydowymi; w skład białek wchodzą głównie takie pierwiastki, jak: węgiel, wodór, tlen i azot
wiązanie peptydowe – powstaje w wyniku połączenia się aminokwasów; tworzą je grupy karboksylowa i aminowa łączących się cząsteczek aminokwasów