Question

Look at the two images of cells.

mc020-1.jpg
Which of the following statements best describes what can be seen in the images?
Image A represents a peptide hormone that interacts with a receptor, and image B represents a steroid hormone that interacts with the cell’s DNA.
Image A represents a steroid hormone that interacts with the cell’s DNA, and image B represents a peptide hormone that interacts with a receptor.
Image A represents an endocrine hormone that interacts with a receptor, and image B represents an exocrine hormone that interacts with the cell’s DNA.
Image A represents an exocrine hormone that interacts with the cell’s DNA, and image B represents an endocrine hormone that interacts with a receptor.

Answer 1

Answer: Image A = peptide hormone interacting with a receptor; Image B = steroid hormone interacting with the cell’s DNA.

Reason: Peptide hormones are water‑soluble and bind to cell‑surface receptors; steroid hormones are lipid‑soluble, cross the membrane, enter the cell/nucleus and bind intracellular receptors to regulate DNA/transcription.