In adults, new connective tissue cells originate from the

Correct Answer: B

Rationale: Mesenchyme, an embryonic connective tissue, persists in adults as a source of new connective tissue cells.

Correct Answer: B

Rationale: Anabolic reactions build molecules (synthesis), requiring energy, unlike catabolic decomposition.

Correct Answer: B

Rationale: Nucleotides (DNA/RNA) have a phosphate, sugar, and base, but not an amino group (found in amino acids).

Correct Answer: A

Rationale: mRNA is transcribed from DNA in the nucleus by RNA polymerase.

Correct Answer: D

Rationale: "Complex stratified' is not a standard epithelial type; others are recognized classifications.