Question

8. Polypeptides have such great biological importance because a) they are long, complex strings, formed from monomers. b) Their "R groups enable them to form complex biomolecules with specific shapes. c) Their 'R' groups have 20 different shapes and charge patterns. d) The 'R' groups can have positive or negative charges or be neutral. e) All are true 9. RNA is a polymer consisting of monomers called a) amino acids b) monosaccharides c) fats, d) nucleotides e) nucleic acids 10. In a laboratory experiment, a researcher reports the use of an isotope to trace the synthesis of a Fatty Acid. From the symbol that is given, we know this is an isotope of Carbon, "C" The CH4 can be substituted for in chemical reactions because it has: a) radioactive properties, b) 14 protons, c) ionic properties, d) 8 neutrons, e) 6 electrons. 11. A polypeptide is a polymer made up of which of the following: a) amino acids, b) a repeating chain of N-C-C-N-C-C etc to form a chain. c) "R" groups bound to each central C. d) all are true, e) none are true. 12. Of the following, which is a complex molecule formed by dehydration synthesis? a) CH,b). NaCl, c) DNA, d) C0. e) All are, 13. Insulin, a biological macromolecule (a polypeptide, protein), is a polymer produced by the pituitary gland. Which of the following is true? a) This polymer is a sequence amino acids b) The monomers are linked by dehydration synthesis. c) When the monomers are connected to form the polymer, an H,O molecule and a bond is formed. d) The bonds linking the monomers are covalent, e) All are true

Answer 1

8. Polypeptides are useful because they are formed of 20 different amino acids. These 20 different amino acids can form thousands of proteins which can perform number of functions. The side chains of amino acids have different polarity and charge.

E. All are true.

9. RNA is formed of number of nucleotides linked to each other by phospho-di-ester bonds.

D. nucleotides.

10. C14 is radio active and also has 8 neutrons. It is used in a chemical reaction because it is radio active.

A. Radio active properties.

11. A polypeptide is a polymer made up of monomers called amino acids. The amino acids are linked by peptide bonds.

a. Amino acid.

12. Dehydration synthesis is a chemical reaction where water molecule is liberated during the formation of a chemical bond.

C. DNA is the right option.

13. Insulin is produced by pancreas and it is a polypeptide.

All polypeptides are formed of amino acids and are linked by peptide bonds. During the formation of peptide bond, water molecule is liberated. The peptide bond is a covalent bond.

E. All are true.