What are Singer and Nicolson known for?
One-gene-one-enzyme hypothesis
Plasma membrane modifications
Fluid-mosaic model of plasma membrane
Structure of DNA
C.
Fluid-mosaic model of plasma membrane
The most recent model of plasma membrane is fluid-mosaic model which was proposed by Singer and Nicolson in 1972. According to this model, the membrane does not have a uniform disposition of lipids and proteins but is instead a mosaic of the two. Further, the membrane is not solid but is quasifluid.
Chemosensitive area of respiratory centre in medulla is affected by
less CO2 and H+ ions
less O2 and H+ ions
excess CO2 and H+ ions
excess O2 and H+ ions
What is the effect of GnRH produced by hypothalamus?
Stimulates the synthesis and secretion of androgens
Stimulates secretion of milk in mammary glands
Stimulates foetal ejection reflex
Stimulates synthesis of carbohydrates from non- carbohydrates in liver
Microvilli of intestinal epithelium are similar in function with
typhlosole in earthworm
hepatic caecae in cockroach
intestinal caecum in earthworm
Malpighian tubules in coackroach
Which of the following have porous body and are diploblastic?
Aurelia and Obelia
Adamsia and Euplectella
Leucosolenia and Spongilla
Sycon and Hydra
The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and bronchi are known as
squamous epithelium
ciliated epithelium
columnar epithelium
cubical epithelium
Which one is correct regarding electrocardiograph (ECG)?
P- wave represents the electrical excitation of the ventricle.
QRS complex represents repolarisation of the ventricles
T- wave represents repolarisation of the atria
By counting the number of QRS complexes one can determine the pulse rate
