1. What is the chemical composition of ) proteins, (2) lipids, (3) carbohydrates
ID: 183986 • Letter: 1
Question
1. What is the chemical composition of ) proteins, (2) lipids, (3) carbohydrates and (9) 2. Which of of the 4 types of biological molecules are often composed of only C, H,&0? 3. Which of the 4 types of biological molecules can be identified by looking at the CH:O nuclei acids? ratios alone? What other elements are commonly associated with each of these four types of macromolecules? a) Which of the 4 types of biological molecules always contain P? b) Which of the 4 types of biological molecules always contain N? c) Which of the 4 types of biological molecules frequently contain S? 4. Based on your answers to questions 1-4 and what you learned from the readings in your textbook what simple rule(s) can you use to identify the following macromolecules? a) nucleic acids b) DNA versus RNA c) proteins 5. d) carbohydrates e) lipids f) phospholipids versus triglyceridesExplanation / Answer
1. Proteins: proteins are the polymer of amino acids. Amino acids are compose of carbon, hydrogen, nitrogen, oxygen and in some cases sulfur and selenium.
Lipids: Lipids are composed of glycerol molecule bonded with long hydrocarbon chain. It contains carbon, hydrogen, nitrogen, oxygen and phosphate.
Carbohydrate: Carbohydrates are the polymer of saccharides composed of carbon hydrogen and oxygen.
Nucleic acids: Nucleic acids are composed of nitrogeous bases, sugar and phosphates and thus contain carbon, hydrogen, oxygen, nitrogen and phosphates.
2. Carbohydrates are composed of only carbon (C), hydrohgen (H) and oxygen (O).
3. Only carbohydrates can be identified by C, H and O ratio alone because rest all biomolecules contain some other elements in addition to C, H, and O.
4. a. Nucleic acids always contain phosphates because nucleic acids are composed of nitrogenous bases, sugar and phosphates.
b. Protein always contain N because proteins are composed of amino acids and all amino acids contain nitrogen atom.
c. Proteins frequently contain sulphur (S) because some amino acids contain sulphur atoms. For example methionine
5. a. Nucleic acids: Five carbon sugar, nitrogenous base and phosphate will be present
b. DNA vs RNA: RNA always contain uracil at place of thymine in DNA and thus DNA will have higher ratio of hydrogen and carbon because thymine has an extra CH3 group.
c. Proteins: Presense of peptide bond. Amino and carboxyl group will be present.
d. Carbohydrate: C, H and O ratio is 1:2:1
e. Lipids: 1:2 ratio of C:H and only very small amounts of O will be present
f. Phospholipids vs triglycerides: Phospholipids always contain phosphate.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.