Why are children often told that if they eat too much candy their teeth will fall out?
A. Sugar attacks tooth enamel.
B. Bacteria use the sugar to make ATP. This fermentation process produces acids as a by-product.
C. Sugars gradually replace the tooth enamel.
D. Bacteria secrete acids in order to digest the sugar molecules.
Answer: B
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What is the difference between covalent bonds and ionic bonds?
A) Covalent bonds require carbon while ionic bonds do not. B) Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. C) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. D) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms. E) Covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms.
The movement of water through a membrane is dependent on
a. the concentration of solute. b. channel proteins. c. the extent of packing of the phospholipids. d. active transport. e. endocytosis.
A __________ is best used to demonstrate the linkage of two genes
a. monohybrid cross b. dihybrid cross c. monohybrid test cross d. two-allele test cross e. two-point test cross
Light energy arrives at Earth in little packets called ________.
A. photons B. light waves C. rays D. wavelengths