Which 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
Which statement is true?
Adenine has 4 nitrogen atoms.
Cytosine has 3 nitrogen atoms
Guanosine has 3 nitrogen atoms
Uracil has 5 nitrogen atoms
B.
Cytosine has 3 nitrogen atoms
Cytosine is one of the four main bases found in DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached. It has 3 Nitrogen atoms.
Adenine is a purine nucleobase used in forming nucleotides of the nucleic acids. It binds to thymine via 2 hydrogen bonds to assist in stabilizing the nucleic acid structure.
Guanosine is a purine nucleoside comprising guanine attached to a ribose ring via - Ng- glycosidic bond. It can be phosphorylated to become guanosine monophosphate (GMP), cyclic guanosine monophosphate (cGMP), guanosine diphosphate (GDP) and guanosine triphosphate (GTP).
Uracil is the nucleobase of RNA instead of thymine in DNA. It binds to adenine via two hydrogen bonds.
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