Which of the following are not membrane bound?
Vacuoles
Ribosomes
Lysosomes
Lysosomes
The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of
ammonia
potassium urate
urea
urea
B.
potassium urate
Insects including cockroach excrete nitrogenous waste in the form of soluble potassium urate which is liberated into the haemolymph and taken up by the cells lining the Malpighian tubules. The tubules facilitate the absorption of urate by stirring up the blood. In the cells of the tubule the potassium urate reacts with water and carbon dioxide(from respiration) to form potassium hydrogen carbonate and uric acid. The former is absorbed back into the blood, but the later is excreted.
Which of the following biomolecules does have a phosphodiester bond?
Fatty acids in a diglyceride
Monosaccharides in a polysaccharide
Amino acids in a polypeptide
Amino acids in a polypeptide
Arrange the following events of meiosis in correct sequence:
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
(b), (a,) (d), (c)
(b), (a) (c), (d)
(a), (b) (c), (d)
(a), (b) (c), (d)
Root pressure develops due to
active absorption
low osmotic potential in soil
passive absorption
passive absorption
Which one of the following animals has two separate circulatory pathways?
Frog
Lizard
Whale
Whale
The structures that help some bacteria to attach to rocks and/or host tissues are
Rhizoids
Fimbriae
mesosomes
mesosomes
Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristic of phylum
Coelenterate
Porifera
Mollusca
Mollusca
The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
Manganese and Chlorine
Manganese and Potassium
Magnesium and Molybdenum
Magnesium and Molybdenum