Which one of the following components of urine in a healthy human does not differ much in concentration from that of blood plasma?
NH4 +
K+
Na+
SO4 2-
The apoplast is located
outside the plasma membrane
in the entire cytosol
on both sides of plasma membrane
in the plastidial content
The aleurone synthesises and secretes digestive enzymes that hydrolyse nutrients stored in the endosperm, in the presence of
auxin
gibberellin
cytokinin
ethylene
ATP synthesis in cell requires
H+ gradient across the membrane
K+ gradient across the membrane
PO4 3- gradient across the membrane
Ca2+ gradient across the membrane
Which one of the following acts solely as an inhibitory neurotransmitter?
Norepinephrine
Gamma () amino butyric acid
Acetylcholine
Dopamine
Which one of the following is called intra-specific chemical messenger?
Pheromones
Prostaglandins
Corticotrophin
Catecholamines
Which one of the following secretes glucagon?
Beta () cells of islets of Langerhans
Alpha () cells of islets of Langerhans
Acidophilic cells of adenohypophysis
Basophilic cells of adenohypophysis
B.
Alpha () cells of islets of Langerhans
The islets of Langerhans are the regions of the pancreas that contain its endocrine cells. Hormones produced in the islets of Langerhans are secreted directly into the blood flow by five types of cells, mentioned as follows.
Alpha cells secrete glucagon.
Beta cells secrete insulin and amylin delta cells secrete somatosatin.
Gamma cells secrete pancreatic polypeptide and epsilon cells secrete ghrelin.
Osteoid refers to
the smallest bone of the body
young hyaline matrix of true bone in which calcium salts are deposited
membranous ossification of cranium
the largest bone of the body