Q1: A. Dopamine cannot cross the blood-brain barrier.
Q2: B. Dopamine is an ester.
Q3: C. L-dopa can cross the blood-brain barrier.
Q4: D. Dopamine deficiency causes a degenerative neural disorder.
Answer Q1: True
Explanation Q1: Dopamine itself cannot cross the blood-brain barrier due to its chemical structure.
Answer Q2: False
Explanation Q2: Dopamine is not an ester; it is a catecholamine, which is an amine derived from the amino acid tyrosine.
Answer Q3: True
Explanation Q3: L-dopa (levodopa) can cross the blood-brain barrier and is often used as a treatment for Parkinson’s disease.
Answer Q4: True
Explanation Q4: Dopamine deficiency is associated with degenerative neural disorders, such as Parkinson’s disease, where the loss of dopamine-producing neurons leads to motor control issues.