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77 Cards in this Set

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  • Back
49. T F
The number of protons in the nucleus of an atom determines its atomic mass.
F
50. T F
The positively charged electrons are found in shells outside the nucleus of an atom.
False
52. T or F
Two shared pair of electrons represent a single covalent bond.
False
53. T or F
The digestion of food is an example of a decomposition reaction.
True
54. T or F
The number and arrangement of electrons orbiting in an aton's outer shell determine its chemical activity.
True
55. T or F
An atom is chemically inert if its outermost shell has 2 pairs of electrons.
False
56. T or F
An isotope of an element contains the same number of neutrons, but different numbers of protons.
False
58. T or F
Radiation results from the breaking apart of the nucleus of an atom.
True
59. T or F
Radioactivity can cause the atom of one element to change to that of another element.
True
60. T or F
Ionizing radiation can be cancer producing.
True
61. T or F
A covalent bond is one in which electrons are either gained or given away.
False
62. T or F
Chemical reactions result in changes in the nucleus of atoms.
False
64. T or F
Substances that resist changes in pH when acids or bases are added is called a buffer.
True
65. T or F
The chemical reaction of an acid with a base always produces a salt and water.
True
66. T or F
Water is the universal solvent.
True
67. T or F
Electrolytes include acids, bases and salts.
True
68. T or F
All inorganic substances are free of carbon.
False
111. Large group of inorganic compounds, including acids, bases, and salts.
electrolyte
69. T or F
Electrolytes are characterized by having either a positive or a negative charge.
True
70. T or F
Sodium is an ion with a negative charge.
False
71. T or F
Acids are electrolytes that produce OH ions.
False
72. T or F
pH stands for the negative logarithm of the hydrogen ion concentration.
True
73. T or F
The chemical reation of a acid with a base always produces a salt and water.
True
74. T or F
Maltose is a monosaccharide.
False
75. T or F
Proteins are the most abundant of the carbon containing compounds in the body.
True
76. T or F
Galactose is the major monosaccharide used by the body.
False
77. T or F
Glycogen and starach are both examples of polysaccharides.
True
78. T or F
There are a total of 20 essential amino acids.
False
79. T or F
"Chemical catalysts" is another name for enxymes.
True
80. T or F
Enzymes are made up of polysaccharides.
False
82. T or F
Steroids are often called "tissue hormones".
False
83. T or F
DNA molecules are the largest molecules in the body.
True
84. T or F
Adenine and thymine are refered to as purine bases which are important constituents of a DNA molecule.
False
85. T or F
Energy released from the food we eat is used directly by cells to do the body's work.
False
88. T or F
Sucrose is the most important simple sugar (monosaccharide).
False
89. T or F
The ability of proteins to perform their function depends on their shape.
True
104. Atoms of the same element but with different atomic weights because their nuclei contain different numbers of neutrons.
isotopes
105. Adenine-thymine and guanine-cytosine are examples of _____ ______ present in DNA.
base pair
107. The number of protons in an atom's nucleus.
atomic number
108. Protein molecules are chain like ______, giant molecules of highly arranged, multiple building blocks.
polymers
109. Components of DNA and RNA that are composed of a sugar, a nitrogenous base, and a phosphate group.
nucleotide
110. Chemical property that allows water to act as an effective solvent.
polarity
34. The simple sugars that are the building blocks for other carbohydrates are:
a. disaccharides
b. monosaccharides
c. polysaccharides
b. monosaccharides
35. The element that is present in all proteins but not in carbohydrates is:
a. carbon
b. hydrogen
c. oxygen
d. nitrogen
d. nitrogen
36. The formation of sucrose involves the removal of a molecule of water. This is called:
a. hydrolysis
b. oxidation
c. decomposition
d. dehydration synthesis
d. dehydration synthesis
38. The basic building blocks of fats are:
a. monosaccharides
b. diaccharides
c. amino acids
d. fatty acids and glycerol
d. fatty acids and glycerol
39. A structural lipid found in the cell membrane is a:
a. triglyceride
b. phospholipid
c. steroid
d. prostaglandin
b. phospholipid
40. DNA:
a. is a single strand of nucleotides
b. contains the sugar ribose
c. is the heredity molecule
d. transports amino acids during protein synthesis
d. transports amino acids during protein synthesis
42. The bonds that exist between phosphate groups of the ATP molecule are:
a. hydrogen bonds
b. high energy bonds
c. covalent bonds
d. ionic bonds
b. high energy bonds
43. The body's most concentrated source of energy is:
a. triglycerides
b. proteins
c. monosaccharides
d. amino acids
a. triglycerides
45. A structural lipid found in the cell membrane is a:
a. triglyceride
b. phospholipid
c. steroid
d. prostaglandin
b. phospholipid
6. The atomic number of carbon is 6. How many unpaired electrons are in its outer shell?
a. 2
b. 3
c. 4
d. 5
c. 4
47. Which of the following is not one of the three major ingredients of a DNA molecule?
a. sugar
b. nitrogenous bases
c. phosphate
d. lipid
d. lipid
12. An example of an element would be:
a. Ne
b. CO2
c. C6H12O6
d. H2O
all numbers are subscript-no feature for
a. Ne (Neon)
13. An isotope of an element contains a different number of _______ than other atoms of the same element.
a. electrons
b. protons
c. neutrons
d. protons and neutrons
c. neutrons
14. Which of the following elements is stable?
a. hydrogen
b. helium
c. oxygen
d. carbon
b. helium
16. Which of the following bonds are the weakest?
a. ionic bonds
b. hydrogen bonds
c. electrovalent bonds
d. covalent bonds
b. hydrogen bonds
17. The type of reaction in which substances are combined to form more complex substances is called a(n):
a. reversible reaction
b. exchange reaction
c. synthesis reaction
d. decomposition reaction
c. synthesis reaction
18. The process of the digestion of food is an example of this type of reaction:
a. synthesis
b. decompositon
c. exchange
d. reversible
b. decomposition
19. Substances that accept hydrogen ions are called:
a. acids
b. bases
c. buffers
d. salts
b. bases
20. Acids:
a. are proton donors
b. taste sour
c. release hydrogen ions in a aqueous solution
d. all of the above
d. all of the above
21. A solution that contains a greater concentration of hydroxide ions(OH-) than hydrogen (H+) ions is a(n):
a. acidic solution
b. alkaline (basic) solution
c. neutral solution
b. alkaline (basic) solution
23. The most abundant and important compound in the body is:
a. air
b. water
c. proteins
d. nucleic acids
b. water
24. Approximately what percentage of body weight is water?
a. 40%
b. 50%
c. 60%
d. 70%
d. 70%
26. Which of the following represent(s) properties of water?
a. cohesion
b. high heat of vaportization
c. strong polarity
d. all of the above
d. all of the above
29. Which of the following is not one of the major groups of organic substances in the human body?
a. proteins
b. salts
c. lipids
d. nucleic acids
b. salts
31. Peptide bonds join together molecules of:
a. glycerol
b. glucose
c. amino acids
d. water
c. amino acids
2. All of the following represent major elements in the body except:
a. sulfur
b. chlorine
c. iron
d. phosphorus
c. iron
3. The kind of element is determined by the number of:
a. protons
b. neutrons
c. mesotrons
d. electrons
a. protons
4. Atomic weight is determined by the number of:
a. protons and electrons
b. neutrons and electrons
c. neutrons, protons and electrons
d. protons and neutrons
d. protons and neutrons
5. Carbon has an atomic number of 6. The number of electrons found in the first shell is:
a. 2
b. 4
c. 6
d. 8
a. 2
1. A positively charged subatomic particle is a(n):
a. proton
b. neutron
c. mesotron
d. electron
a. proton
7. Matter is any substance that has mass and occupies:
A. time
b. distance
c. space
d. gravity
c. space
8. A negatively charged subatomic particle that moves around the nucleus is a(n):
a. orbital
b. proton
c. neutron
d. electron
d. electron
9. The atomic number directly indicates the number of:
a. protons
b. neutrons
c. electrons
d. neutrinos
a. protons
10. When atoms combine, they may gain or lose:
a. electrons
b. protons
c. neutrons
d. nuclei
a. electrons
11. An ionic bond is formed by:
a. two or more positive ions combining
b. two or more negative ions combining
c. a positive and a negative ion attracting each other
d. sharing of a pair of electrons
c. a positive and a negative ion attracting each other