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Locomotion is a very important feature in animals. Considering the frequent need for locomotion in animals, an animal would obtain the greatest benefit from storing its energy as:
Answer 4. Fats have a higher calorific value but most importantly are lighter than corresponding sized proteins and carbohydrates.
In the average composition of a cell, the maximum % of total cellular mass [after water and protein] is constituted by:
Answer 3. Read page 147, Table 9.4, XI NCERT
Where would you expect to find serine and alanine amino acids in a globular protein in aqueous solution?
(b) Serine has hydroxymethyl R group that can form hydrogen bonds with water while alanine has methyl R group.
The vitamin Niacin functions as a coenzyme in:
(b) Niacin works in two enzyme systems (NAD and NADP). They affect all the tissues of the body. These enzyme systems help transport hydrogen within the cell. They also make it available for biosynthesis. These two enzymes also work closely with the energy molecule adenosine trisphosphate (ATP).
The six most common atoms in organic molecules are:
Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous and Sulphur
The unique properties of each amino acid are determined by its particular:
The unique properties of each amino acid are determined by its particular R (side chain) group. The R groups vary in structure, size, charge, and chemical properties, which gives each amino acid its distinct characteristics and influences its behavior in proteins.
Which of the following biomolecules does have a phosphodiester bond?
Phosphodiester bond is in responsible for linking nucleotides in nucleic acid (DNA and RNA).
The chitinous exoskeleton of arthopods is formed by the polymerisation of
The chitinous exoskeleton of arthropods is formed by the polymerisation of N-acetyl glucosamine, which is a derivative of glucose. It is also a characteristic component of the cell wall of fungi, the radulae of molluscs and the beaks and internal shells of cephalopods, including squid and octopuses.
Which one of the following statements is correct, with reference to enzymes?
(b) Holoenzyme It is a conjugate complete catalytically active enzyme together with its coenzyme.
Apoenzyme The protein part of catabolically active enzyme is called apoenzyme.
Coenzyme Some enzymes require additional organic or metallo-organic molecules for their activity. These molecules are called coenzyme. So, holoenzyme is apoenzyme together with coenzyme hence option (b) is correct.
Which of the following are not polymeric?
(d) Among the given options except lipids all are polymers. These are formed by the polymerisation of monomers. The basic unit of lipid are fatty acids and glycerol molecules that do not form repetitive chains. Instead they form triglycerides from three fatty acids and one glycerol molecule.
Protein monomers are amino acids and they bond together in repetitive chain just as, carbohydrate monomers are monosaccharides.
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