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

Based on the NFPA diagram below for magnesium turnings, and what you know about NFPA ratings, which of the following statements is/are true: $ Select one: 1 A. Safety goggles are not required when working with magnesium turnings because the health hazard rating is 0. B. Gloves are not required when working with magnesium turnings because the health hazard rating is 0. C. Magnesium turnings can be disposed of in the sink. D. None of the above are true O E. A, B and C OF. A and B

The dissolved coffee in hot water can be separated by which technique? a. using a magnet b. evaporating the water c. filtering the solution d. decanting the solution

Note: no need for explanation, just answer it all with letters. Thank you

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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.

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