Which one of the following is wrong statement?
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
Nitrosomonas and Nitrobacter are chemoautotrophs.
Anabaena and Nostoc are capable of fixing nitrogen in free-living state also.
Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
Both Assertion and Reason are false
The graph shows the rate of an enzyme reaction at different levels of acidity or alkalinity (pH). From the graph, what is the optimum pH for this enzyme?
pH 2
pH 7
pH 10
pH 8
Assertion: Arachidic acid is an unsaturated fatty acid.
Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
Assertion is true, but Reason is false
Both Assertion and Reason are false.
The most prevalent compound in a living cell is normally:
Protein
Nucleic acid
Water
Lipid
Carbohydrates, the most abundant biomolecules on earth, are produced by:
Fungi, algae and green plants cells
All bacteria, fungi and algae
Some bacteria, algae and green plant cells
Viruses, fungi and bacteria
Water has a high capacity for heat (thermal capacity). Which of the following may be the advantage in living cells due to this?
Any rise in temperature is small in comparison with the amount of heat absorbed by a cell
Any rise in temperature is large in comparison with the amount of heat absorbed by a cell
The 75% water in a cell does not retain a lot of heat
Any change in temperature will cause a cell to heat up or cool down quickly
The given graph shows the effect of substrate concentration on the rate of reaction of the enzyme green gram phosphatase. What does the graph indicate?
The rate of enzyme reaction is directly proportional to the substrate concentration
Presence of an enzyme inhibitor in the reaction mixture
Formation of an enzyme-substrate complex
At higher substrate concentration the pH increases
A protein molecule which is denatured, has :
Split into smaller molecules
Changed its shape
Combined with another molecule
Been diluted
Carbohydrate
