Multiple Choice QuestionsWhich of the following is responsible for the mechanical support, protein synthesis and enzyme transport?
Cell membrane
Mitochondria
Dictyosome
Endoplasmic reticulum
Thickening of arteries due to cholesterol deposition is
arteriosclerosis
rheumatic heart
blood pressure
cardiac arrest
An example of competitive inhibition ofan enzyme is the inhibition of
succinic dehydrogenase by malonic acid
cytochrome oxidase by cyanide
hexokinase by glucose-6-phosphate
carbonic anhydrase by carbon dioxide
Which of the following is the connecting link between glycolysis and Krebs cycle?
Acetyl Co- A
Oxalosuccinic acid
Pyruvic acid
Citric acid
A.
Acetyl Co- A
Glycolysis is the first step of respiration in which glucose is broken down to pyrurate.
During glycolysis 1 molecule of glucose is converted to 2 molecules of pyruvic acid in the cytoplasm. These two molecules of pyruvic acid are then converted to acetyl Co-A by decarboxylation. This acetyl Co-A is the connecting link between glycolysis and Kreb's cycle and functions as substrate entry for Kreb's cycle. Acetyl Co-A thus formed participates in Kreb's cycle and combines with oxaloacetic acid to form citrate.
Which statement is true?
Adenine has 4 nitrogen atoms.
Cytosine has 3 nitrogen atoms
Guanosine has 3 nitrogen atoms
Uracil has 5 nitrogen atoms
Which of the following helps in ascent of sap?
Root pressure
Transpiration
Capillarity
All of these
Which of the following is correct set of micronutrient for plants?
Mg, Si, Fe, Cu, Ca
Cu, Fe, Zn, B, Mn
Mg, Fe, Zn, B, Mn
Mo, Zn, Cl, Mg, Ca
Velamen present in orchids helps in
absorption of nutrients from host plant
respiration
absorption of moisture from air
synthesising food
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