Which process takes place as the filtrate from a glomerulus passes along a nephron?
A) production of amino acids
B) excretion of oxygen
C) production of urea
D) reabsorption of glucose
▶️ Answer/Explanation
Ans: D
As filtrate moves along the nephron:
- Reabsorption of glucose (D) occurs in the proximal convoluted tubule, where essential nutrients like glucose are actively transported back into the bloodstream.
- Amino acids (A) are not produced but reabsorbed; oxygen (B) is not excreted in nephrons.
- Urea (C) is produced in the liver, not the nephron.
Thus, the correct answer is D (Reabsorption of glucose), as it is a key function of the nephron.
Where are amino acids deaminated and converted into urea?
A) bladder
B) kidneys
C) liver
D) pancreas
▶️ Answer/Explanation
Ans: C
The liver (C) is the organ where deamination occurs—a process in which excess amino acids are broken down. The nitrogenous part is converted into urea, while the remaining carbon skeleton is used for energy or stored as fat.
The kidneys (B) filter urea from the blood, and the bladder (A) stores urine. The pancreas (D) produces digestive enzymes and hormones but does not participate in deamination. Thus, the correct answer is C (Liver).