Tiêu đề 2-Biological Molecules (Revision Test) - Engeecon Academy 2.0.pdf ✅

1. Question 1 points In sickle cell haemoglobin only one glutamic acids of normal haemoglobin is replaced by; 1. A. Valine acid 2. B. Alanine acid 3. C. Arginine acid 4. D. Methionine acid Incorrect Explanation: A Text Book Reference 2. Question 1 points Waxes are the esters of fatty acids with high molecular weight. 1. A. Monohydroxy alcohol 2. B. Dihydroxy alcohol 3. C. Trihydroxy alcohol 4. D. All of the above Incorrect Explanation: A Text Book Reference 3. Question 1 points The most abundant organic biomolecule in a cell is 1. A. Water 2. B. Protein 3. C. Nucleic acids 4. D. Carbohydrates Incorrect 
Explanation: B Most Abundant = Water Most Abundant organic = Protein Most Abundant in nature then Carbohydrate (Cellulose) 4. Question 1 points Water protects organisms against sudden thermal change because 1. A. Universal solvent 2. B. It ionize slowly 3. C. High heat capacity 4. D. Abundancy Incorrect Explanation: C KP-Textbook information 5. Question 1 points Combination of two different functional group monosaccharide by condensation make 1. A. Lactose 2. B. Maltose 3. C. Sucrose 4. D. Amylose Incorrect Explanation: C Lactose = glucose + galactose → have same functional group aldehyde Maltose = glucose + glucose Sucrose = glucose + fructose ⇒ Glucose has aldehyde ⇒ Fructose has ketone 6. Question 1 points Which of the following is usable by human body 1. A. Right handed sugar 
2. B. Left handed amino acids 3. C. Left handed sugars 4. D. Both A & B 5. E. Both A & C Incorrect Explanation: D Textbook information 7. Question 1 points When the secondary level of protein make a 3-D structure the protein is now called 1. A. Primary 2. B. Secondary 3. C. Tertiary 4. D. Quaternary Incorrect Explanation: C Primary = straight Secondary = Bend or coil Tertiary = Coil structure Quaternary = Super coil 8. Question 1 points Which of the following are correctly associated? 1. A. RNA: Thymine 2. B. DNA: Uracil 3. C. RNA: Replication 4. D. mRNA: Picks up amino acids 5. E. RNA: Ribose sugars Incorrect Explanation: E RNA is made up of a ribose sugar bound to a phosphate group, which is then bound to one of the four bases. It is also characterized by having uracil as one of 
its bases rather than thymine (as in (A)). DNA, meanwhile, utilizes thymine rather than uracil (B), as for (C), RNA does not replicate in eukaryotic cells; only DNA can replicate. In (D), tRNA carries the amino acids to the ribosome, while the mRNA carries the message of the protein that is to be produced to the ribosome. 9. Question 1 points The types of lipid which do not contain any fatty acid is 1. A. Acylglyceroid 2. B. Phospholipid 3. C. Steroid 4. D. Waxes Incorrect Explanation: C Steroid made up of four fused rings of 17 carbons. 10. Question 1 points Which type of conjugated molecule is found in cell membrane as well as the component of brain. 1. A. Lipoprotein 2. B. Glycolipid 3. C. Glycoprotein 4. D. Nucleoprotein Incorrect Explanation: B Textbook information 11. Question 1 points In total cell weight of a bacterial cell, carbohydrates constitute only: 1. A. 0.25 2. B. 2 3. C. 3 