Chapter Questions
The atomic number gives thea. number of neutrons in the nucleus.b. number of protons in the nucleus.c. weight of the atom.d. number of protons in the valence shell.
Isotopes differ in theira. number of protons.b. atomic number.c. number of neutrons.d. number of electrons.
Which type of bond results from the complete transfer of electrons from one atom to another?a. covalentb. ionicc. hydrogend. neutral
A covalent bond in which electrons are not shared equally is calleda. polar.b. normal.c. nonpolar.d. neutral.
Compounds having an affinity for water are said to bea. cohesive.b. hydrophilic.c. hydrophobic.d. adhesive.
Water flows frecly but docs not separate into individual molecules because water isa. cohesive.b. hydrophilic.c. hydrophobic.d. adhesive.
__________ contribute hydrogen ions $\left(\mathrm{H}^{+}\right)$ to a solution.a. Basesb. Isotopesc. Acidsd. Compounds
Which of the following is an organic molecule?a. $\mathrm{CO}_{2}$b. $\mathrm{O}_{2}$c. $11_{2} \mathrm{O}$d. $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}$
The combination of two monomers to produce a polymer is an example of which of the following types of reactions?a. denaturationb. hydrolysisc. dehydration synthesisd. complementary base pairing
Which of the following is a monosaccharide?a. glucoseb. lactosec. cellulosed. sucrose
An example of a polysaccharide used for energy storage in humans isa. cellulosc.b. cholesterol.c. glycogen.d. starch.
Which of the following is the plant polysaccharide that is not digestible by humans?a. fructoseb. lactosec. starchd. cellulose
Saturated and unsaturated fatty acids differ in thea. number of carbon-to-carbon double bonds.b. consistency at room temperature.c. number of hydrogen atoms prescnt.d. All of these are correct.
A triglyceride containsa. glycerol and three fatty acids.b. glycerol and two fatty acids.e. protein and three fatty acids.d. a fatty acid and three sugars.
Which of the following lipids is used to manufacture the sex hormones testosterone and estrogen?a. phospholipidsb. trans fatsc. triglyceridesd. cholesterol
Variations in three-dimensional shapes among proteins are due to bonding between thea. amino groups.c. $R$ groups.b. ion groups.d. $\mathrm{H}$ atoms.
At what level of protein structure do multiple polypeptide chains interact?a. primaryb. secondaryc. tertiaryd. quaternary
Under extreme environmental conditions, such as temperature or $\mathrm{pH}$, proteins may lose their three-dimensional shape. This is calleda. dehydration synthesis.b. hydrolysis.c. digestion.d. denaturation.
An RNA nucleotide differs from a DNA molecule in that RNA has .a. a ribosc sugar.b. a uracil base.c. a phosphate molecule.d. Both a and b are correct.
This nucleic acid is typically involved in cnergy reactions ina cell.a. RNAb. DNAc. $A T P$d. All of these are correct.