Chemical co-ordination is maintained by ___________.
Enzymes
Hormones
Vitamins
Antibodies
________ are chemicals secreted by exocrine glands and relased into the external environment.
Hormones
Parathormones
Cortisones
Pheromones
The neuro-hormones, acetylcholine and sympathin, are quickly inactivated by an enzyme _________.
Cholinesterase
Cholesterol
Sympathase
None of the above
How many polypeptide chains make a molecule of haemoglobin?
2
4
6
8
The oxide ring structure of glucose was proposed by
Estable and sotelo
Bush and smetana
Fischer
Tomlin
Which of the following is the shortest fatty acid found in human fat?
Acetic acid
Butyric acid
Lignoceric acid
Oleic acid
The hydrocarbon chain of a saturated fatty acid has zig-zag configuration with the bond angle between carbon-carbon being
104º
117º
100º
109º
What among the following is a precursor of vitamin D?
Cholic acid
Cholesterol
Ergosterol
Androsterone
The presence of which of the following elements distinguishes proteins from fats and carbohydrates ?
Carbon
Oxygen
Sulphur
Nitrogen
Which of the following amino acids is not hydrophobic?
Glycine
Alanine
Serine
Threonine
Which of the following is the only amino acid without an asymmetric carbon atom?
Alanine
Glycine
Valine
Leucine
Which of the following amino acids has sulphur in its side chain?
Leucine
Serine
Methionine
Aspartic acid
The polypeptide chain my undergo coiling and folding to produce the
Primary protein
Secondary protein
Tertiary protein
Quaternary protein
Which of the following simple proteins are insoluble in all neutral solvents and in dilute alkalies and acids?
Albuminoids
Histones
Glutelins
Globulins
The open chain form of glucose is folded because of the
Tetrahedral bond angles of the carbon atom
Symmetrical shape of the glucose molecule
Even number of carbon atoms in the molecule
None of the above