Practice free Biomolecules (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In a 50 gm living tissue, what would be the amount of water?
(c) Water is the most abundant chemical compound in living organism. In a cell, water occupies 70-90% of the cellular mass. So, in 50 gm of living tissue 35-45 gm of water would be present.
Which of the following elements is present in very less quantity in the body?
(d) Trace elements or microelements (e.g. iron, iodine, zinc, manganese, cobalt, copper, molybdenum, etc.) are required in very samll amounts to our body.
In a normal adult, ascending order of concentration of following molecules is
(a)
Which of the following is a homopolysaccharide?
(b) Homopolysaccharides or homoglycans are those complex carbohydrates which are formed by polymerization of only one type of monosaccharide monomers. For example, starch, glycogen, inulin, cellulose, chitin, etc.
Agar, pectin, hyaluronic acid, heparin, etc., are heteropolysaccharides.
From the following groups, select the one which has only secondary metabolites?
(d) Secondary metabolites are derivates of primary metabolites which have no direct function in growth and development of plants. These compounds are accessory rather than central to the functioning, eg., arbin, cellulose, gums, diterpenes, carotenoids, curcumin, rubber etc. Arginine, tyrosine, glycine, serine and phenylalanine are amino acids, which are primary metabolites.
DNA and RNA comprise of
(a) DNA and RNA are nucleic acids which are found in living systems. DNA is a long polymer of deoxyribonucleotides and RNA is a long polymer of ribonucleotides. A nucleotide has 3 components - a nitrogenous base, a pentose sugar and a phosphate group.
Which of the following options consist of non-essential amino acids only?
(b) Non-essential amino acids are those amino acids which can be synthesized by human body from raw materials. Glycine, serine, proline, glutamic acid all are non-essential amino acids.
Which one of the following is an incorrect combination?
(a) Adenine (A), guanine(G), cytosine (C), thymine (T) and uracil (U) are all nitrogenous bases, whereas cytidine is a nucleoside i.e, a combination of a nitrogenous base (cytosine) with a pentose sugar (ribose).
Nickel contributes to the formation of one of the following
(a) Enzyme Metal
Urease Nickel
Dehydrogenase Zinc
Nitrate reductase Molybdenum
The quaternary structure of a protein:
Primary structure of a protein is the linear sequence of amino acids.
The quaternary structure of a protein is the association of several protein chains or subunits into a closely packed arrangement. Each of the subunits has its own primary, secondary, and tertiary structure. The subunits are held together by hydrogen bonds and van der Waals forces between nonpolar side chains.
The number of subunits in the quaternary structure of a protein can be 2 (dimer), 4 (tetramer), trimers, pentamers, and hexadecamers and higher order structures.
The functional properties of multi-subunit proteins depends on the quaternary structure.
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