Which of the following drugs is fibrinolytic?

Correct Answer: B

Rationale: The correct answer is B: Streptokinase. Streptokinase is a fibrinolytic drug that helps break down blood clots by activating plasminogen. This process helps improve blood flow in conditions like myocardial infarction or stroke. Ticlopidine (A) is an antiplatelet drug, Aspirin (C) is also an antiplatelet agent, and Warfarin (D) is an anticoagulant. These drugs work differently from fibrinolytics and do not directly dissolve blood clots like Streptokinase does.

Correct Answer: B

Rationale: The correct answer is B because Nifedipine is a calcium channel blocker, not a dopamine receptor antagonist. Nifedipine works by blocking calcium channels in vascular smooth muscle, causing vasodilation. Hydralazine can cause reflex tachycardia due to its potent vasodilatory effects. Nitroprusside dilates both arterioles and veins, leading to decreased afterload and preload. Minoxidil is a potent arteriolar vasodilator used to treat hypertension but can cause hypertrichosis as a side effect.

Correct Answer: B

Rationale: The correct answer is B: Insulin-like growth factors (IGF somatomedins). Growth hormone stimulates the liver to produce IGF, which is the main mediator of GH effects on growth. IGF acts on various tissues to promote growth and development. Glucocorticoids (A) are not direct targets of GH. Triiodothyronine (C) and testosterone (D) have roles in growth but are not primary targets of GH action.

Correct Answer: B

Rationale: The correct answer is B because glucagon is indeed a peptide consisting of a single chain of 29 amino acids. This is a known fact in biochemistry. Glucagon is a hormone produced by the pancreas that plays a key role in regulating blood sugar levels. Now, let's analyze why the other choices are incorrect: A: Glucagon is not a glycoprotein with a molecular weight of 6000. This is not a characteristic of glucagon. C: Glucagon is not a fructooligosaccharide. It is a peptide hormone, not a type of carbohydrate. D: Glucagon is not a small protein with a molecular weight of 5808 having a disulfide linkage. While glucagon does have disulfide linkages, its molecular weight is not 5808.

Correct Answer: A

Rationale: The correct answer is A: Piroxicam. Piroxicam is an oxicam derivative because it belongs to the oxicam class of NSAIDs. It is characterized by its oxicam structure containing a 1,2-benzothiazine ring. The other options, Indomethacin, Meclofenamic acid, and Diclofenac, do not have the oxicam structure. Indomethacin is an indole derivative, Meclofenamic acid is a fenamic acid derivative, and Diclofenac is an acetic acid derivative. Therefore, Piroxicam is the correct choice based on its specific chemical structure that classifies it as an oxicam derivative.