Which of the following is NOT a nitrogenous base found in DNA? MCQ with Answer and Explanation

Explanation:
Scurvy is caused by a deficiency of Vitamin C (ascorbic acid), leading to bleeding gums; rickets is caused by Vitamin D deficiency. Iron is essential for hemoglobin synthesis, and its deficiency leads to iron-deficiency anemia, causing fatigue and weakness. Iodine is required for thyroid hormone production, and its deficiency causes the enlargement of the thyroid gland, known as goiter. Thus, statements 2 and 3 are correct.

Explanation:
Antonie van Leeuwenhoek, using his hand-crafted single-lens microscopes, was the first to observe and describe living sperm cells, bacteria, protozoa, and red blood cells in the 1670s. Hooke saw dead cork cells, Pasteur and Koch later advanced microbiology with germ theory and pure culture techniques.

Explanation:
Urobilin is derived from bilirubin, a heme breakdown product, and gives urine its yellow color. R is true and explains A.