Assignments of Engineer Abdlellatif

ass chim 8

1. DNA and RNA are the two kinds of ________________ found in cells.


a. carbohydrates
b. lipids
c. steroids
d. nucleic acids


2. Proteins are polymers made up of these monomers.


a. vitamins
b. amino acids
c. hexoses
d. alkenes


3. _____________ function as biological catalysts, make up your muscles and tendons, and help transport substances in your blood.


a. Carbohydrates
b. Esters
c. Proteins
d. Sugars


4. An __________ atom is at the center of the hemoglobin molecule.


a. iron
b. carbon
c. nitrogen
d. copper


5. More than 95% of the atoms in your body are these four elements.


a. oxygen, carbon, hydrogen, and nitrogen
b. oxygen, hydrogen, calcium, and carbon
c. iron, phosphorus, carbon, and hydrogen
d. hydrogen, iron, silicon, and oxygen


6. In this process, cells generate glucose anaerobically.


a. oxidation
b. glycolysis
c. fermentation
d. respiration


7. Enzymes provide active sites where _____________ can bind.


a. alkynes
b. lactases
c. minerals
d. substrates


8. These are biological compounds that contain a large proportion of C-H bonds and less oxygen than carbohydrates.


a. sugars
b. lipids
c. substrates
d. bones


9. What functional groups are found in the vitamin C molecule?


a. hydroxyl, ester, alkene
b. amine, ester, alcohol
c. hydroxyl, alkyne, carbonyl
d. amide, alkene, ether


10. Lipids serve to store energy and ________________ in the body.


a. digest carbohydrates
b. provide calcium
c. form membranes
d. form bones


11. In proteins, these structures are held together by hydrogen bonds, ionic bonds, and disulfide cross-links.


a. polypeptides
b. carbon atoms
c. monomers
d. amino acids


12. The sum of all the chemical reactions necessary for the life of an organism is its ____________.


a. locomotion
b. respiration
c. metabolism
d. digestion


13. ______________ are made in specific organs of the body and travel through the bloodstream to communicate with cells in other locations.


a. Fats
b. Hormones
c. Nucleic acids
d. Vitamins


14. ____________ was the first biomolecule synthesized outside of a living cell.


a. urea
b. formaldehyde
c. ethanol
d. benzene


15. Cells store energy by forming this compound.


a. sucrose
b. acetone
c. stearic acid
d. ATP


16. What is the product of an endothermic reaction in which an inorganic phosphate group is added to adenosine diphosphate?


a. glucose
b. ATP
c. ADP
d. lactic acid


17. Animals store energy in their livers and muscles as _____________.


a. glucose
b. sucrose
c. glycogen
d. starch


18. If a molecule contains a 5-carbon sugar, the nitrogen base uracil, and can be used in protein synthesis, then the molecule is __________.


a. DNA
b. RNA
c. thymine
d. cytosine


19. By what type of reaction are monosaccharides linked together to form disaccharides?


a. condensation
b. addition
c. combustion
d. dehydration


20. Glucose, fructose, and ribose are _____________.


a. polymers
b. proteins
c. monosaccharides
d. disaccharides

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