Q- Which of the following is the most abused drug for all ages in the United States?
A- Alcohol
B- Cocaine
C- Marijuana
D- Methamphetamine
A- Alcohol- Alcohol remains the most commonly abused substance across all age groups in the United States. Marijuana is widely used but does not surpass alcohol in terms of overall abuse rates. Cocaine and methamphetamine are far less common.
Q- Which one of the following enzyme deficiencies is related to Tay-Sachs disease?
A- Arylsulfatase A deficiency
B- Glucocerebrosidase deficiency
C- Hexosaminidase A deficiency
D- Sphingomyelinase deficiency
C- Hexosaminidase A deficiency- Tay-Sachs disease is caused by a deficiency of hexosaminidase A, leading to accumulation of GM2 gangliosides in neurons. Arylsulfatase A deficiency causes metachromatic leukodystrophy, glucocerebrosidase deficiency causes Gaucher disease, and sphingomyelinase deficiency causes Niemann–Pick disease.
Q- Which statement is true regarding action of lung surfactant?
A- It affects large alveoli more than small alveoli
B- It elevates surface tension forces and decreases compliance
C- It lowers surface tension and decreases compliance
D- It lowers surface tension and increases compliance
D- It lowers surface tension and increases compliance- Lung surfactant reduces surface tension in the alveoli, which prevents alveolar collapse and makes the lungs easier to expand. This increases lung compliance, especially in smaller alveoli.
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1 A
2 C
3 D