University Of Pennsylvania

Extremophiles grow under what conditions? - Answer They grow under extreme conditions of pH, temperature, pressure, etc. Microbes are classified according to what? - Answer Their preferred growth environment What are the three cardinal temperatures? - Answer Minimum, Optimum, and Maximum Enzyme activity, membrane fluidity, DNA stability, etc are all influenced by what? - Answer Temperature Psychrophiles temperature range is? - Answer Low, <15 degrees C = optimum ...

Noncellular "entities" that some regard as straddling the border between life and nonlife: a) Viruses b) Bacteria c) Yeasts d) Algae - Answer a) Viruses Yeasts and molds belong to a group of microorganisms known as the: a) Protozoa b) Helminths c) Fungi d) Prokaryotes - Answer c) Fungi Microorganisms that produce diseases are said to be: a) Avirulent b) Ubiquitous c) Aerotolerant d) Pathogenic - Answer d) Pathogenic Molds from visible masses called _______, which a...

Centrifugation - Answer Quantifying bacteria by mass. Separates components by density using high speed spinning. Volume or dry weight of the pellet is proportional to the number of cells per unit volume in the original suspension Turbidity - Answer Quantifying bacteria with a spectrophotometer. Absorbance is roughly equal to cell density. More turbidity means more cell density. Direct microscopic counts - Answer Quantifying bacteria by amount. Counting the number of cells within g...

What are the common traits of Streptococcus and Enterococcus? - Answer Gram positive cocci, they do not produce endospores, they are aerotolerant, and strepcoccus are arranged in long chains, negative response to catalase What does the catalase assay detect? - Answer It detects the presence of the enzyme catalase, which is an important oxygen detoxifying enzyme. What does catalase do and what classifications of species need it? - Answer It eliminates reactive hydrogen peroxide, a ...

methods for counting bacteria - Answer centrifugation turbidity direct microscopic count most probable number quantitative plate count centrifugation - Answer suspended cells are spun down into a pellet. dry weight of the pellet is proportional to number of cells per unit volume of original suspension turbidity - Answer uses a spectrophotometer to measure the cloudiness of a suspension of cells. cells deflect, refract, and absorb light, so a greater absorbance reading = gre...

Exp 1- Resolution - Answer The ability to see objects that are close together as separate objects - light waves only resolve things 0.2 micrometers and larger Exp 1- Magnification - Answer The enlargement of specimen when it is seen through the microscope Exp 1- Magnification formula - Answer Magnification = (eyepiece) x (objective lense) Exp 1- Microscope: Use of Oil - Answer ONLY USED WITH 100X LENS Decreases light refeaction Exp 1- Microscope: Working Distance - Answe...

Test Bank – Essentials of Strategic Management: The Quest for Competitive Advantage | Chapter 7

PCCN 2025 Exam Questions With 100% Correct Answers

PCCN 2025 Exam Questions With 100% Correct Answers

Agile Safe 6.0 2024 ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS