Entamoeba histolytica differs from Amoeba in absence of
pseudopodia
contractile vacuole
nucleus
ectoplasm
B.
contractile vacuole
Contractile vacuole is a cell organelle related with osmoregulation, ie, removal of excess water and present in free living protozoa like Amoeba and absent in parasitic protozoa like Entamoeba histolytica.
Pseudopodia are locomotory organelles of class Sarcodina or Rhizopoda, eg, Entamoeba, Amoeba.
Nucleus and ectoplasm are present in all protozoans.
In parasympathetic nervous system, which of the following is released?
Epinephrine
Norepinephrine
Serotonin
Acetylcholine
Which of the following is important for muscle contraction and nerve impulse transmission?
Ca2+ ions
Ca2+ and Mg2+ ions
Mg2+ ions
Fe2+ ions
The velocity of conduction of nerve impulse in frog is
300 m/s
same as of electricity
faster than sound
30 m/s
Which one is component of Ornithine cycle?
Ornithine, citrulline and alanine
Ornithine, citrulline and arginine
Amino acids are not used
Ornithine, citrulline and fumaric acid
Which compound has a very important role in prebiotic evolution?
Sulphur dioxide
Nitric oxide
Methane
Sulphur trioxide
