Which row shows active transport?

Correct Answer: C

Rationale: The correct answer is C because active transport involves the movement of particles from low concentration to high concentration, which goes against the natural flow of diffusion and requires energy input. In active transport, cells use ATP to pump substances across the cell membrane against their concentration gradient. This process allows cells to accumulate essential molecules or ions that are needed in higher concentrations inside the cell. Choices A, B, and D all describe passive transport processes where particles move with the concentration gradient and do not require energy input.

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.

Correct Answer: D

Rationale: Step 1: The pancreas is an elongated organ located behind the stomach. Step 2: The tail of the pancreas is the left end of the organ and is closest to the hilum of the spleen. Step 3: The spleen and the tail of the pancreas are adjacent to each other in the upper left quadrant of the abdomen. Step 4: Therefore, the correct answer is D: Tail. Summary: - A: Head is incorrect as it is the right end of the pancreas, farther away from the spleen. - B: Neck is incorrect as it is the narrow portion between the head and body, not near the spleen. - C: Body is incorrect as it is the central and longest part of the pancreas, not near the spleen. - D: Tail is correct as it is the left end of the pancreas, nearest to the hilum of the spleen.