Which of the following is NOT true about dental plaque?(a) It is an intermittently formed coating of microbes andorganic matter on tooth surfaces that serve as the firststep in tooth decay and gum disease.(b) It begins as positively charged salivary proteins adhereto negatively charged enamel surfaces, forming a pellicle(film) over the tooth surface.(c) Streptococcus mutans attaches to the pellicle where ithydrolyzes sucrose to fructose and glucose, or polymersof glucose that serve as bridges, holding together cells inplaque.(d) Plaque consists of up to 30 different genera of bacteriaand their products, such as polymers of glucose (dex-tran), saliva proteins, and minerals.(e) Plaque that is allowed to accumulate in crevices near thegumline can change into anaerobic pockets full of bacte-ria that can irritate the gums or destroy underlying bone.

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Respiratory Infections

Respiratory infections are infectious diseases of the respiratory tract that are mostly caused by bacteria and viruses. They cause infections of the throat, sinuses, airway path, and lungs. Respiratory infections are typically divided into two types: upper tract respiratory infection and lower tract respiratory infection.