Consider the following statements about vitamins: 1. Vitamin K is essential for bone health. 2. Vitamin D deficiency can cause rickets. 3. Vitamin A is also known as tocopherol. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
The clavicle is the collarbone. Patella is kneecap; radius is forearm; tibia is shinbone. So B is correct.

Explanation:
Phenylketonuria (PKU) is an autosomal recessive disorder due to deficiency of phenylalanine hydroxylase, leading to accumulation of phenylalanine, causing mental retardation if untreated. Albinism is tyrosinase deficiency, sickle cell HbS mutation, cystic fibrosis CFTR defect.

Explanation:
Immunoglobulin G (IgG) is the most abundant antibody in blood plasma, providing long-term immunity and crossing the placenta. Immunoglobulin E (IgE) is present in small amounts and binds to mast cells, triggering the release of histamine during allergic reactions. Immunoglobulin A (IgA) is predominantly found in mucosal secretions like saliva, tears, and breast milk, providing localized mucosal immunity. All statements are correct.