Atoms and Molecules
Which of the following subatomic particles will vary in different isotopes of an element?
a. Neutrons
b. Protons
c. Electrons
d. Valence shells
a. Neutrons
What term is used to refer to stored energy?
a. Kinetic
b. Chemical
c. Potential
d. Electrical
c. Potential
Which of the following is NOT a characteristic of water?
a. Lubricates body surfaces
b. Low heat capacity
c. High solubility
d. Hydrogen bonding
b. Low heat capacity
Which of these is the name for the chemical group NH2?
a. Carboxylic
b. Amino
c. Hydroxyl
d. Phosphate
b. Amino
Which part of an amino acid will combine with the amino group of another amino acid?
a.The amino group
b. The carboxylic acid group
c. The central carbon
d. The R group
b. The carboxylic acid group
Which element has the symbol Fe and is important in oxygen transport and energy capture?
a. Sodium
b. Iodine
c. Iron
d. Phosphorus
c. Iron
Which of the following is true of each side of a balanced equation?
a. There is an equal number of chemical bonds
b. Number of atoms of each element is equal
c. Number of molecules is equal
d. Total energy is equal
b. Number of atoms of each element is equal
Which of teh following substances will break apart in water?
a. Sodium chloride
b. Glucose
c. Oil
d. Protein
a. Sodium chloride
Which of these is a monosaccharide?
a. Sucrose
b. Glycogen
c. Glucose
d. Maltose
c. Glucose
Which of the following components is found in DNA, but not in RNA?
a. Cytosine
b. Guanine
c. Adenine
d. Thymine
d. Thymine
How many energy levels in a sodium atom are occupied by electrons?
a. One
b. Two
c. Three
d. Four
c. Three
Which of teh following is the mechanism of enzymes?
a. Lower activation energy
b. Add kinetic energy to reactants
c. Provide energy to make bonds
d. Slow down substrates
a. Lower activation energy
What term refers to a solution containing dispersed large molecules that will NOT settle out?
a. Suspension
b. Solution
c. Colloid
d. Mixture
c. Colloid
Which of these is NOT made from glucose?
a. Maltose
b. Starch
c. Glycogen
d. Fructose
d. Fructose
A saturation limit can occur in the action of which of the following?
a. Enzymes
b. High-energy compounds
c. Transfer RNA
d. Glycolipids
a. Enzymes
Which of the following elements will form a polar covalent bond with oxygen to form water?
a. Carbon
b. Nitrogen
c. Sodium
d. Hydrogen
d. Hydrogen
What is the molecular weight of H2CO3 if the atomic weight are H=1, C=12 and O=16
a. 29
b. 30
c. 62
d. 114
c. 62
What is the normal blood pH?
a. Neutral
b. Slightly acidic
c. Slightly alkaline
d. The same as water
c. Slightly alkaline
Which of these lipids finctions as a chemical messenger for local cellular activities?
a. Steroids
b. Eicosanoids
c. Phospholipids
d. Glycerides
b. Eicosanoids
High-energy bonds are found in which of the following?
a. Phosphate-amino acid bonds
b. Phosphate-phosphate bonds
c. Phosphate-adenosine bonds
d. Peptide bonds
b. Phosphate-phosphate bonds
Which of the following is the basis of surface tension?
a. Ionic bonds
b. Hydrogen bonds
c. Hydrostatic bonds
d. Adhesive bonds
b. Hydrogen bonds
If magnesium is atomic number 12, how many chloride ions will combine with one magnesium ion?
a. One
b. Two
c. Three
d. Four
b. Two
Which of these would NOT be part of a buffer system?
a. Sodium bicarbonate
b. Carbonic acid
c. A salt and a weak acid
d. Hydrochloric
d. Hydrochloric acid
Which of the following substances can form micelles?
a. Polysaccharides
b. Steroids
c. Phospholipids
d. Triglycerides
c. Phospholipids
Which of the following is true concerning the chemical makeup of DNA?
a. Hydrogen bonds connect purines to
pyrimidines
b. Phosphate and amino groups form the
double helix
c. Ribose and deoxyribose alternate
along the helix
d. Nucleotides join to
amino acids
Which of the following
molecules contains the most hydrogen
atoms per carbon atom?
a. Saturated fatty acid
b. Monounsaturated fatty acid
c. Polyunsaturated fatty acid
d. Triglyceride
a. Hydrogen bonds connect purines to pyrimidines
a. Saturated fatty acid