1831. Which of the following statements about the energy needs of cells is false ?
A. Without a constant contribution of energy cell confusion will increment
B. The laws of thermodynamics force cells to gain energy
C. The rapid combustion of glucose yields the most useful energy for cells *
D. Many cellular reactions have an associated activation energy
1832. In Lysozyme catalysis which of the following does not contribute ?
A. The abnormally high pka of glu35
B. The D sugar’s strained conformation
C. A covalent intermediate is formed at Asp52.
D. A covalent intermediate is formed at ser195 *
1833. Fibers made of cellulose resemble the structure of proteins in the following ways:
A. B-Sheets *
B. A-helices
C. B-Turns
D. None of these
1834. During vigorous exercise pyruvate produced by glycolysis is converted to :
A. Acetate
B. Lactate *
C. Monosodium phosphate
D. Pyruvic acid
1835. Glucagon and epinephrine
A. Inhibits gluconeogenesis and stimulates glycolysis
B. Stimulates gluconeogenesis and glycolysis
C. Stimulates gluconeogenesis and inhibits glycolysis
D. Stimulates gluconeogenesis and inhibits glycolysis *
1836. Human lysozyme hydrolyzes the Nag6 substrate to produce:
A. 6 glucosamines +6 acetic acids
B. NAG4+NAG2 *
C. NAG3+NAG3
D. NAG3
1837. Gluconeogenesis uses:
A. Three ATPs and two GTPs for each glucose
B. Two ATPs and one GTP for each glucose
C. Three ATPs and three GTP for each glucose
D. Four ATPs and two GTP for each glucose *
1838. Saliva contains all of the following except :
A. Harmones *
B. Amylase
C. Bacteria-killing enzymes
D. Antibodies
1839. The conversion of pyruvate to oxaloacetate:
A. Requires biotin *
B. Involves the fixation of carbon dioxide
C. Occurs in the mitochondria
D. All of the above
1840. Gluconeogenesis is the :
A. Formation of glycogen
B. Breakdown of glucose to pyruvate
C. Breakdown of glycogen to glucose
D. Synthesis of glucose from non-Carbohydrates precursors *