BIO 250 Microbiology (BIO250)

What microbial process was responsible for changing Earth's atmosphere from one without oxygen to one with oxygen? Oxygenic photosynthesis 2. In the nitrogen cycle, which of the following phases involves the release of Nitrogen into the Earth's atmosphere? Denitrification 3. Farmers commonly inoculate legume crops with Rhizobium bacteria for which of the following purposes? The two form a symbiotic relationship increasing the plant's access to nitrogen. 4. In the secondary phase of w...

Microbial drug resistance can be caused by mutations or by introduction of new genes into a population. Which of the following can only be caused by the introduction of new genes into a population? a. A metabolic pathway in the bacterium is shut down b. Binding sites for the drug are reduced in number or affinity to the drug c. New enzymes that inactivate the drug are synthesized d. Uptake of the drug into the bacterium is diminished Answer is c. This can only occur if new genes into a po...

The number of infectious viral particles can be calculated by Select one: a. counting the number of colonies that form on an agar plate. b. counting the number of plaques that form on an agar plate. c. counting the number of viral particles using a microscope. d. taking a turbidity measurement of a dilution of the viral solution. The correct answer is: counting the number of plaques that form on an agar plate. Which quantitation method is capable of providing the quickest measurement of...

BIO 250 Microbiology Quiz 4 | Questions With Correct Answers 2023/2024 (Latest Update Graded A+). Denature proteins when in a 50-95% alcohol-water solution b. Disinfect items soaked in alcohol c. Are skin degerming agents d. At 50% or higher concentrations dissolve cell membrane lipids e. All of the choices are correct Feedback The correct answer is: All of the choices are correct Question8 Incorrect Mark 0.00 out of 5.00 Flag question Question text The reticuloendothelial system Se...

The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is Select one: a. It provides an excellent nitrogen source for bacteria. b. Bacteria are unable to break it down so it stays solidi ed. c. It melts at 100 C and solidi es at temperatures below 50 C. d. It provides an excellent carbon and energy source for bacteria. The ribosomal RNA studies that led to the division of prokaryotic organisms into the Bacteria and the Archaea were...

ATP is a Select one: a. by-product of ADP that breaks down phosphates for photosynthesis. b. catalyst for all chemical reactions that occur in the cell. c. long chain of nucleotides responsible for protein synthesis. d. nucleotide that releases and stores energy in the cell. A viral capsid is composed of Select one: a. carbohydrates. b. lipids. c. enzymes. d. proteins. Which of these are NOT considered living organisms? Select one: a. monera b. plants c. protists d. viruses Fin...