Biology MCQS

831. If more substrate to already occurring enzymatic reaction is added, more enzyme activity is seen because_____________?
A. There is probably more substrate present than there is enzym
B. There is probably more enzyme available than there is substrate
(C. There is probably more product present than there is either substrate or enzyme)
D. None of these

832. Enzymes ______ the activation energy of a chemical reaction?
A. Increases
(B. Decreases)
C. Does not affect
D. Increases or decreases depending upon individual enzyme

833. Which one forms the raw material for coenzymes_______________________?
(A. Vitamins)
B. Carbohydrates
C. Proteins
D. Metals

834. 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

835. 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

836. 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

837. During vigorous exercise, pyruvate produced by glycolysis is converted to:
A. Acetate
(B. Lactate)
C. Monosodium phosphate
D. Pyruvic acid

838. 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)

839. Human lysozyme hydrolyzes the Nag6 substrate to produce:
A. 6 glucosamines +6 acetic acids
(B. NAG4+NAG2)
C. NAG3+NAG3
D. NAG3

840. 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)