In most ectopic pregnancies, where does the embryo implant?

Correct Answer: D

Rationale: In ectopic pregnancies, the embryo implants outside the uterus, most commonly in the Fallopian tube (D), not the uterus (A), pelvic bone (B), or vagina (C).

Correct Answer: D

Rationale: Lactase (D) breaks down lactose, a sugar. Catalase (A) degrades hydrogen peroxide, lipase (B) breaks fats, and protease (C) digests proteins.

Correct Answer: B

Rationale: Lymph collects excess fluid and returns it to blood vessels (B). Red blood cells (A) are made in bone marrow, the heart (C) doesn’t regulate lymph production, and white cells (D) don’t target red cells.

Correct Answer: C

Rationale: The gallbladder is part of the digestive system (C), storing bile. It’s not endocrine (A), urinary (B), or nervous (D).

Correct Answer: A

Rationale: The clavicle (A) is the only horizontal long bone (collarbone). Humerus (B) is vertical, scapula (C) is flat, and ischium (D) is pelvic.