Question

43. Oxygen has 8 electrons and Argon has 18 electrons. What type of molecule would be formed it these two elements reacted. a) No reaction would occur. b) They would form an lonic hond with the Amon giving electrons to Oxygen. c) They would form a covalent bond by sharing 2 electrons. d) 2 argons would bond to oxygen. e) C and D are possible. 44. Magnesium (*2 Mg 24) forms bonds with how many Chlorine (CIS) atoms? a) 4, b) 3, c) 2, d) 1, e) 45. The theory of Chemical Evolution asserts that cellulose or glycopen (carbohydrate polymers that will eventually be associated with living cells) form spontaneously by dehydration synthesis from? a) Polypeptides, b) Glucose, c) Phosphate, d) Amino acids, e) Glycerol 46) Which of the following statements best summarizes the differences between DNA and RNA? A) DNA encodes hereditary information, whereas RNA does not Bi The bases in DNA contain sugars, whereas the bases in RIA 00 not contain sugar. C) DNA nucleotides contain a different sunr than RNA nucleotides. D) DNA contains the base uracil, whereas RNA contains the base thymine. E) The bases in DNA contain sulfur, whereas the bases in RNA do not contain sulfur. 47) When polymerization of a protein is complete, but a protein is still completely linear, what is the highest level of structure in the protein? A) primary B) secondary C) tertiary D) quaternary 48) What are prions? A) mobile segments of DNA B) tiny circular molecules of RNA that can infect plants C) viral DNA that attaches itself to the host genome and causes disease D) misfolded versions of normal protein that can cause disease E) viruses that invade bacteria 49) Proteins in biological systems A) store genetic information B) link with other proteins to form bilayers in cell membranes C) form high-energy intermediates such as ATP D) catalyze reactions 50) What is the major structural difference between starch and glycogen? A) the types of monosaccharide subunits in the molecules B) the type of glycosidic linkages in the molecule C) whether glucose is in the a or B form D) the amount of branching that occurs in the molecule

Answer 1

43. Ans- a) No reaction would occur.

Comments- Argon is the third of the noble gases or inert gases. It is very non-reactive. It is non-reactive because the shells are full. Argon has 3 electron shells. The third shell is filled with 8 electrons. That is why it does not combine easily with other elements.

44. Ans- c) 2

Comments- Magnesium bond with two chlorine atoms which need one electron

45. Ans- b) Glucose

46. Ans- c) DNA nucleotides contain a different sugar than RNA nucleotides.

Comments- DNA consists of sugar called deoxyribose while RNA consist of ribose sugar. The only difference is that one more hydroxyl or -OH group is present in RNA at the second (2') carbon ring. The deoxyribose sugar exhibit hydrogen or -H group attached to the second (2') carbon ring.

47. Ans- a) Primary

48, Ans- d) misfolded version of normal proteins that can cause disease.

Comments- They characterize several fatal and transmissible neurodegenerative diseases in humans and many other animals.

49. Ans- d) catalyse reaction

50. Ans- a) the types of monosaccharide subunits in the molecule.