Cartilage is not found in

Correct Answer: C

Rationale: Cartilage is a soft skeletal tissue or connective tissue with spaced cells. The solid matrix consists of proteins and sugar. Cartilage smooths bone surfaces at joints and is present in the nose, ear, trachea and larynx.

Correct Answer: B

Rationale: Ectoderm, mesoderm, and endoderm are the three germ layers in an embryo from which all differentiated cells arise.

Correct Answer: A

Rationale: Skeletal muscle has striations, cylindrical cells, and multiple nuclei, unlike cardiac (branched, single nucleus) or smooth muscle (no striations).

Correct Answer: A

Rationale: A compound consists of different elements (atoms) chemically bonded, unlike elements with one atom type.

Correct Answer: B

Rationale: Molecular weight is the sum of atomic weights of all atoms in a molecule.