Verapamil is a drug used for treating hypertension. It should be used with caution with other drugs that can depress heart rate or contractility. Which drug, if given with verapamil, might therefore cause the greatest risk of depressing heart rate, contractile force, or impulse conduction?

Correct Answer: C

Rationale: The correct answer is C: Propranolol. Verapamil is a calcium channel blocker that can depress heart rate and contractility. Propranolol is a beta-blocker that also decreases heart rate and contractile force. When combined, both drugs can have an additive effect leading to a significant decrease in heart rate and contractility, potentially causing bradycardia or heart failure. Albuterol (A) is a beta-2 agonist that actually increases heart rate and contractility. Scopolamine (B) is an anticholinergic drug that may decrease heart rate, but its effect is not as significant as propranolol. Isoproterenol (D) is a beta agonist that increases heart rate and contractility, so its combination with verapamil would not pose the same risk as propranolol.

Correct Answer: A

Rationale: The correct formula for aluminium sulfate is Al2(SO4)3. This is because aluminium has a 3+ charge while sulfate has a 2- charge, requiring two aluminium ions to balance three sulfate ions. Choice B (Al2(SO3)4) is incorrect because sulfate ions have a 2- charge, not sulfite ions (SO3). Choices C (Al4(SO4)2) and D (Al4(SO3)2) have incorrect subscripts for the elements, not following the correct charge balance.

Correct Answer: D

Rationale: The correct answer is D: 2.0, sinks. Density is calculated by mass/volume. If the density of the block is 2.0, it means it is denser than the liquid (density of water is around 1.0), so it will sink. If the density was 0.50, it would be less dense than the liquid and float, making choices A and C incorrect. Choice B is also incorrect as a block with a density of 0.50 would float.

Correct Answer: A

Rationale: The correct answer is A: glucose-containing hormones. Hormones are classified based on their chemical structure, and glucose-containing hormones do not fit into any of the main categories (steroid, protein-based, amino acid-based). Glucose is a sugar molecule and not typically found as the primary chemical structure of hormones. Steroid hormones are derived from cholesterol, protein-based hormones are made of amino acids, and amino acid-based hormones are derived from single amino acids or peptides. Therefore, glucose-containing hormones do not align with the traditional chemical classifications of hormones.

Correct Answer: A

Rationale: The correct answer is A: half-life. Water-soluble hormones have a shorter half-life compared to lipid-soluble hormones because they are quickly metabolized and excreted from the body. The other choices are incorrect because: B: Activation time is not directly related to the solubility of hormones. C: The size of the hormone molecule doesn't determine its solubility in water. D: The chain of amino acids may vary in different types of hormones, but it doesn't necessarily dictate their solubility.