1)Which of the following is true of enzyme characteristics? (a)enzymes catalyze reactions when a substrate binds to the allostericsite (b) enzymes catalyze reactions by increasing the activationenergy (c) enzymes do not exhibit specificity and a single enzymecan catalyze various different reactions (d) enzymes lower theactivation energy of specific reactions, speeding up the reactionrate
2) Microbial growth is measured by what parameter? (a) increasedcell size (b) increased size of cellular components (c) increase intotal number of cells (d) a & b
3)During aerobic cell respiration, most of the energy isproduced during… (a) Krebs cycle (b) glycolysis (c) fermentation(d) electron transport chain
4)Which of the following is the best definition of generationtime? (a) the length of time it takes for lag phase to occur (b)the length of time it takes a population of cells to double (c) theminimum length of time it takes a cell to divide (d) the length oftime a culture stays in stationary phase
5)Bacteria make exoenyzmes in order to… (a) make structureswithin the bacterium (b) synthesize large molecules ofcarbohydrates, proteins, and nucleic acids (c) hydrolyze largemolecules to smaller ones so that they can be transported into thebacterium (d) none of the above; bacteria do not makeexoenyzmes
6)Which of the following is NOT true of using aspectrophotometer to measure bacterial growth? (a) measurement isbased on turbidity of the broth culture (b) this method accountsfor both dead and viable cells (c) this method uses thetransmission of light through the broth culture to estimateconcentration of cells (d) this method requires serial dilutionsprior to measurement
answer followings
