Carbohydrates are commonly found as starch in plant storage organs. which of the following five properties of starch (A-E) make it useful as a storage material?
A) Easily translocated
B) Chemically non-reactive
C) Easily digested by animals
D) Osmotically inactive
E) Synthesized during photosynthesis
The useful properties are
(B) and (C)
(B) and (D)
(A), (C) adn (E)
(A), (C) adn (E)
C.
(A), (C) adn (E)
Starch is a high molecular weight polymer of D-glucose in the alpha 1→4 linkage. It is synthesised in chloroplasts as it is one of the stable end product of photosynthesis. It is most abundant and common storage polysaccharide in plants hence, a most staple food for man and herbivores. It is a mixture of two types of glucose homopolysaccharide viz, amylose and amylopectin. During day time the starch synthesis in chloroplast is coordinated with sucrose synthesis in the cytosol. Typically about 90% of total solute carried in phloem is the carbohydrate sucrose. a disaccharide. This is relatively inactive and highly soluble sugar playing little direct role in metabolism and so making an ideal transport sugar.
In leaves of C4 -plants malic acid synthesis during CO2 -fixation occurs in
epidermal cells
mesophyll cells
bundle sheath
bundle sheath
Cellulose is the major component of cell walls of
Pythium
Xanthomonas
Pseudomonas
Pseudomonas
The slow rate of decomposition of fallen logs in nature is due to their
low moisture content
poor nitrogen content
anaerobic environment around them
anaerobic environment around them
The haemoglobin of human foetus
has a lower affinity for oxygen than that of the adult
its affinity for oxygen is the same as that of an adult
has only 2 protein subunits instead of 4
has only 2 protein subunits instead of 4
Which one of the following scientist's name is correctly matched with the theory put forth by him?
Weissmann-Theory of continuity of germplasm
Pasteur - Inheritance of acquired characters
de Vries - Natural selection
de Vries - Natural selection
The most active phagocytic white blood cells.
neutrophils ane eosinophils
lymphocytes and macrophages
eosinophils and lymphocytes
eosinophils and lymphocytes
The two subunits of ribosome remain united at a critical ion level of
Copper
Manganese
Manganese
Manganese
During the propagation of a nerve impulse, the action potential results from the movement of
K+ ions form extracellular fluid of intracellular fluid
Na+ ions from intracellular fluid to extracellular fluid
K+ ions from intracellular fluid to extracellular fluid
K+ ions from intracellular fluid to extracellular fluid
