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Which one is Purine base of RNA? [C.B.S.E. PMT 1996]
Guanine is one of the purine bases found in RNA. The purine bases are adenine and guanine. The other bases mentioned (thymine, uracil, and cytosine) are either pyrimidine bases (thymine and cytosine) or specific to DNA (thymine).
Acidic amino acid among the following is
Glutamic acid is classified as an acidic amino acid because it has a carboxyl group (-COOH) in its side chain that can donate a proton (H+), making the solution acidic. In contrast, Valine, Lysine, and Arginine have different side chains that do not have this acidic property.
Which one is not gain by the hydrolysis of nucleoside? [DPMT 1996]
Nucleoside on hydrolysis yields nitrogen bases (purine, pyrimidine) and pentose sugar (ribose, deoxyribose)
The pair of nitrogen base in DNA is conjugated with [PB PMT 1997]
Base pairs occur when nitrogenous bases make hydrogen bonds with each other. Each base has a specific partner: guanine with cytosine, adenine with thymine (in DNA) or adenine with uracil (in RNA)
Enzyme speed up rate of reaction by [C.B.S.E. 2000]
Enzymes speed up the rate of reaction by lowering the activation energy required for the reaction to proceed. They do this by providing an alternative reaction pathway with a lower activation energy. This does not change the equilibrium of the reaction, but it allows the reaction to reach equilibrium faster.
The catalytic efficiency of two different enzymes can be compared by the
The Km value (Michaelis constant) is used to compare the catalytic efficiency of different enzymes. It represents the substrate concentration at which the reaction rate is half of its maximum value (Vmax). A lower Km value indicates higher affinity of the enzyme for the substrate, meaning the enzyme is more efficient at lower substrate concentrations.
Which of the following cell organelles is rich in catabolic enzyme [PMT 2007]
Mitochondria are known as the powerhouse of the cell because they are rich in catabolic enzymes. These enzymes are involved in the breakdown of molecules to produce energy in the form of ATP through cellular respiration.
Enzyme which help in electron transfer are: [B.H.U. 1998]
Cytochromes are proteins that play a key role in the electron transport chain, which is a series of complexes that transfer electrons from electron donors to electron acceptors via redox reactions. This process is essential for the production of ATP in cellular respiration.
Enzyme involved in hydrolysis of starch to maltose is called: [PMT 1999]
Amylase is an enzyme that catalyzes the hydrolysis of starch into sugars, primarily maltose. It is present in saliva and pancreatic juice and helps in the digestion of dietary starches.
Due to what food supply has increased during green revolution?
Due to use of agrochemicals fertiliser and pesticide the yield during green revolution was immense.
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