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True or False
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1
Protein accounts for the greatest percentage of the body's total weight.
A)True
B)False
2
A chemical bond between two atoms consists of shared electrons.
A)True
B)False
3
The atomic mass of an atom is the sum of the number of its protons and neutrons.
A)True
B)False
4
The atomic number of an atom is equal to the number of electrons in the atom.
A)True
B)False
5
A full electron orbital always contains eight electrons.
A)True
B)False
6
Different isotopes of each other are considered to be the same chemical element.
A)True
B)False
7
A covalent bond is one in which two atoms share one pair of electrons.
A)True
B)False
8
Water is able to dissolve more substances than any other solvent because the molecules of water are nonpolar.
A)True
B)False
9
A chlorine atom has seven electrons in its valence shell and becomes a chloride ion when it receives an electron from some other atom and completes this shell.
A)True
B)False
10
Sodium chloride comes apart readily in water because it is so hydrophobic.
A)True
B)False
11
Water would not have any surface tension if water could not form hydrogen bonds.
A)True
B)False
12
Ionic bonds form when similarly charged ions form a bond because of charge similarities.
A)True
B)False
13
Ionic bonds are weaker than covalent bonds.
A)True
B)False
14
Electronegative atoms are those that exert an attractive force on nearby electrons.
A)True
B)False
15
The hydrogen ions released from acids combine with water molecules to form H3O+ (hydronium) ions.
A)True
B)False
16
A solution with a pH of 7.0 has a hydrogen ion concentration equal to 7 molar.
A)True
B)False
17
A solution with pH 7 has a thousand times the hydrogen ion concentration of one with pH 10.
A)True
B)False
18
Organic molecules contain carbon and hydrogen arranged in rings and chains.
A)True
B)False
19
Any two atoms can only share one pair of electrons when they form a covalent bond.
A)True
B)False
20
Organic molecules with six-carbon rings and alternating double bonds are called aromatic compounds.
A)True
B)False
21
Benzene is a six-sided ring of carbon atoms with one hydrogen atom attached to each and with alternate double covalent bonds between the carbon atoms.
A)True
B)False
22
Stereoisomers of each other react the same way chemically, because they have the same atoms in the same atoms in the same sequence.)
A)True
B)False
23
The digestive breakdown of starch to simple sugars is an example of dehydration synthesis.
A)True
B)False
24
Of all the lipids, only fatty acids are freely soluble in water, due to their free carboxyl groups.
A)True
B)False
25
Triglycerides are described as neutral fats because they cannot release free H+ ion.
A)True
B)False
26
Uncontrolled diabetes mellitus can lead to an excessive concentration of ketones in the blood.
A)True
B)False
27
Phospholipids could not form micelles if it were not for that fact that they have both hydrophobic and hydrophilic components in their structure.
A)True
B)False
28
Prostaglandins get their name from the fact that they are only produced by the prostate gland.
A)True
B)False
29
A molecule is classified as either hydrophilic or hydrophobic because it either mixes with water or it does not. It cannot be both.
A)True
B)False
30
The precise structure of a protein is determined by a different class of organic compounds, namely the nucleic acids.
A)True
B)False
31
The primary structure of a protein is determined by its peptide bonds.
A)True
B)False
32
Not all proteins have a quaternary structure.
A)True
B)False
33
A disulfide bond is stronger than an ionic bond.
A)True
B)False
34
Tendons and ligaments get their strength from a protein called collagen.
A)True
B)False
35
Based on the law of complementary base pairing the amount of adenine in a DNA molecule would be equal to the amount of thymine in the same DNA molecule.
A)True
B)False
36
A nucleotide consists of a phosphate group, a nitrogenous base, and a hexose sugar.
A)True
B)False





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