A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of
fats
ketones
amino acids
glucose
ADH controls water permeability of
collecting tube
proximal convoluted tubules
distal convoluted tubules
all of the above
Which of the following amino acids are present in ornithine cycle
Valine and cystine
Arginine and citrulline
Glycine and methionine
None of these
In living beings ammonia is converted into urea through
ornithine cycle
citrulline cycle
fumarine cycle
arginine cycle
A.
ornithine cycle
Ornithine combines with one molecule of NH3 and CO2 to produce citrulline. Citrulline combines with another molecule of NH3 to form arginine. Arginine is broken down into urea and ornithine which repeats the cycle.
Which part of the nephron is impermeable to water
Proximal convoluted tubule
Distal convoluted tubule
Ascending limb of loop of Henle
Descending limb of loop of Henle
The ornithine cycle removes two waste products from the blood in liver. These products are
CO2 and urea
ammonia and urea
CO2 and ammonia
ammonia and uric acid