BIOCHEM TEST QUESTIONS

• GLYCEROL


  It is a tri-hydroxy alcohol found as a backbone in triglycerides.
• Starch


  ALL of the following are considered as sugar, except?

  ● Maltose

  ● Sucrose

  ● Lactose

  ● Starch
• glyceraldehyde


  The smallest/simplest carbohydrate contains 3 carbon atoms
• Heparin


  The acidic polysaccharide that has an anticoagulant property.
• When a monosaccharide reacts with Benedict’s reagent, an aldonic acid is formed.
• Carbohydrates are synthesized by plants through the process of photosynthesis.
• Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the sun, into chemical energy that can be later released to fuel the organism's activities
• Mineralocorticoid


  The hormones that regulate the concentration of sodium and potassium ions in the body.

  *aldosterone
• Arginylalanylasparagine


  The tripeptide made of arg-ala-asn is called
• pyranose


  The six-membered ring formed by an aldohexose is called a
• Sucrose


  Which DOES NOT belong to the group?

  • Glucose
  • Sucrose
  • Fructose
  • Galactose
• All of the following are function of proteins

  ● As hormones

  ● For transport of materials

  ● As enzymes
• hydrolysis

  It is the process wherein the ester linkage of a triglyceride splits into glycerol and 3 fatty acid molecules.
• NOT


  Is this Function or NOT a function of lipids?

  • Signals are transferred from one neuron to another through its dendrites.
• N-acetyl-D-glucosamine


  It is an amino sugar found in many polysaccharides like in cartilage and chitin
• Lipids are naturally occurring organic compounds which are insoluble in water but are soluble in nonpolar solvents.
• Chloroform, ether, benzene, alcohol


  solvents that will dissolves lipids readily?
• Hydrogenation


  It refers to the reduction of a carbon-carbon double bond resulting to a saturated fatty acid.
• isoelectric point


  It is the pH value at which the net charge of a protein is equal to zero.
• Active transport


  This type of transport across the cell membrane spends energy since it will involve passage across a concentration gradient
• glycine


  All of the following has an enantiomer EXCEPT

  • glycine
  • lysine
  • valine
  • glutamic acid
• Rancidity in oils is caused by a/an Oxidation reaction
• Vasopressin


  A nonapeptide that acts as an antidiuretic hormone.
• Quaternary structure


  The highest organizational structure of a multimeric (several polypeptide chains) protein.
• sucrose


  All of the following are reducing sugars EXCEPT

  • Maltose
  • cellobiose
  • sucrose
  • lactose
• Sphingolipid 


  The type of lipid found in myelin sheath
• lysine


  Which DOES NOT belong to the group?

  • Tryptophan
  • lysine
  • tyrosine
  • phenylalanine
• A


  All of the following are functions of cholesterol EXCEPT

  • It serves as a protective coating.
  • Precursor for bile salts
  • It provides rigidity to the cell membrane.
  • Precursor for steroid hormones.
• C


  Which of the following is NOT TRUE about zwitterions?

  • Zwitterions are formed from the internal acid-base reaction between the amino and carboxylic groups of amino acids.
  • They explain the solubility of amino acids in water.
  • They give rise to the molecular structure of amino acids.
  • It results to a high melting point of amino acids.
• Phospholipids


  The major structural component of the cell membrane.
• Glycogen


  It acts as the energy reserve storage form of carbohydrates in humans.
• snRNA


  The type of RNA that is involved in processing the initial mRNA produced in the DNA into a mature RNA ready for export out of the nucleus.
• false


  The long fiber-like structure of a neuron is the dendrite while the hair-like structure is the axon. TRUE or FALSE
• Acetylcholinesterase


  The enzyme that removes acetylcholine from the receptor site.
• Neurotransmitter


  A compound that acts over a short distance from the synapse
• Glyceraldehyde and dihydroxyacetone


  The two smallest biochemically important monosaccharides.
• enantiomers


  Molecules which are nonsuperimposable mirror images are called
• Sunflower oil


  Which oil likely contains unsaturated fatty acids?
• decreases


  The presence of an unsaturation in a fatty acid __________the melting point of its triglyceride.
• linoleic acid


  It is an essential fatty acid that serves as a precursor of eicosanoids