microbiology exam (669)

Which of the following is true about heavy metals and their environmental impact? a. Coffee and tea waste could be viable options to rid water of heavy metals. b. Based on the study shown in class, coffee is definitively the best option to rid heavy metals from water. c. Coffee, tea and caffeine all remove heavy metals from contaminated water through absorption. d. Copper is the most prevalent metal found in drinking water that can cause harm to the environment and humans. e. Copper and zinc concentrations in drinking water are significantly higher in areas with human activity.

Hand written solutions are strictly prohibited.

If a transparent substance (light goes through it) appears red, the substance is _______ res light.  a. transmitting  b. absorbing  c. refelecting

a. List six types of cells sensitive to radiation. b. List eight side effects of radiation.

Which of the following will give a negative deviation to Beers Law?  I. polychromatic radiation II. presence of stray light III. presence of particulates on the sample A. I and II only        B. II and III only        C. I and III only       D. I only

Surface agents that prevent particle agglomeration are: A. Pathogens b. foaming C. ATP d. Emulsifiers

22.a. Which of the following statements describes the change of specific gravity during battery charging?A. The specific gravity increases faster than the state of charge.B. The specific gravity lags behind the state of charge.C. The change in specific gravity with time is directly proportional to the amount of charge.D. A hydrometer reading shows the true state of charge when taken shortly after charging has begun.22.b. The purpose of the vent on the top of a lead-acid cell is toA. permit the gas to escape during charging.B. add water to the cells.C. trap the hydrogen gas generated during charging.D. remove the sediment developed during charging.

QUESTION 31 Strong group cohesiveness can be a leadership A. Substitute B. Neutralizer C. Bolth A and B above D. None of above QUESTION 32 One of the reasons that make PFP (Pay-for-performance) plans fail is that employees do not believe that their performance will be rewarded. According to the Expectancy Theory of Motivation, this is due to........ A. Low Valence B. Weak Instrumentality link C. Weak Expectancy link D. None of Above QUESTION 33 Performance management/Compensation are organizational practices based on.... A. Maslow's Need Theory B. Goal Setting Theory C. Social Learning Theory D. Equity theory E. Expectancy theory

Eating of pechay and asparagus make your alimentary tract prone to gas formation. This is due to what element abundant in these plants upon metabolism?  a. fiber b. oxygen c. sulfur d. carbon dioxide Choose one answer only. Clue: Letter A is not the answer.

Table 1. Mass calculations for copper electrode. Mass of copper (initial) (g) Mass of copper (final) (g) Mass of copper oxidized (g) 1. Table 2. Record of current (measured in amps) and time (measured in minutes) as they changed throughout the experiment. 0 3 6 9 Complete the following table: Table 3. Summary of observation data. 2.4622 Time Current Time Current Time 24 0.154 12 15 0.153 27 18 0.152 30 21 0.152 33 0.157 0.156 0.155 0.155 Data Analysis: 2.3269 0.135 Total reaction time (s) Average current (A) Volume of H, produced (mL) Barometric pressure (kPa) Partial pressure of water vapour (kPa) Partial pressure of H₂ al produced (kPa) Temperature (°C) Current Time Current 0.151 36 0.151 39 0.150 42 0.149 45 50.00 101.40 3.19 25.00 0.148 0.148 0.147 0.146 Show how you calculated the partial pressure of the hydrogen gas that was produced. 2. Determine the number of mols of H₂ gas produced using the ideal gas law. R = 8.314 kPa L mol-¹K-¹ (1) (2) Based on the anode information (3) (1)…

Briefly explain what you should do before you dispose of waste or excess materials.