Several minerals such as iron, iodine, calcium and phosphorous are important nutrients. Iodine is found in
(A) thyroxine (B) adrenaline (C) insulin (D) testosterone
In the 16th century, sailors who travelled long distances had diseases related to malnutrition, because they
were not able to eat fresh vegetables and fruits for months at a time. Scurvy is a result of deficiency of
(A) carbohydrates (B) proteins (C) Vitamin C (D) Vitamin D
Blood clotting involves the conversion of
(A) prothrombin to thromboplastin (B) thromboplastin to prothrombin
(C) fibrinogen to fibrin (D) fibrin to fibrinogen
If parents have free ear lobes and the offspring has attached ear lobes, then the parents must be
(A) homozygous (B) heterozygous (C) co-dominant (D) nullizygous
After 2 hours the amount of a certain radioactive substance reduces to 1/16th of the original amount (the
decay process follows first-order kinetics). The half-life of the radioactive substance is
(A) 15 min (B) 30 min (C) 45 min (D) 60 min
At 298 K, assuming ideal behaviour, the average kinetic energy of a deuterium molecule is
option
(A) two times that of a hydrogen molecule
(B) four times that of a hydrogen molecule
(C) half of that of a hydrogen molecule
(D) same as that of a hydrogen molecule