In the Griffith experiment, why didn't the bacteria from rough colonies harm the mice? Because they had been heat killed Because they do not make a capsule layer Because they do not take up DNA from the environment Because they were not actually Streptococcus
Q: A bacterium that can form endospores likely has the ability to; withstand high temperatures resist…
A: Bacteria is a prokaryotic cell with few micrometer in length and can exist in various shapes and…
Q: Bacteria exposed to penicillin do not die immediately, but they cannot reproduce. Explain why
A: Penicillins are a part of β-Lactam group of antibiotics , which are widely used to treat different…
Q: Why is Micrococcus luteus a common contaminate on bacteriological media?
A: The strain is typically connected with human skin, especially from the head, arms and legs;…
Q: An apple pie has 3 million bacterial cells. The crust might have been inoculated with 500 bacterium.…
A: Bacteria are prokaryotic organisms. They reproduce asexually without the formation of gametes.…
Q: diluted a bacterial culture a million-fold. you then plated out 0.1 mL of dilution and after…
A: The growth in a body-temperature incubator of micro-organisms on a medium of culture, like agar, for…
Q: You have spread 0.1ml of a 1x10-8 diluted bacterial culture sample on a Petridish and counted 35…
A: Given Volume plated = 0.1ml Total dilution = 108 Number of colony = 35
Q: You perform a quadrant streak and isolate a single colony which contains two distinct species of…
A: Quadrant streaking is a technique for microbial inoculation in which a single colony is isolated on…
Q: Bacillus cereus divides every 30 minutes. You inoculate a culture with exactly 100 bacterial…
A: When bacteria grow by the binary fission, the bacterial population increases by the geometric…
Q: The goal of Disc diffusion test is Select one: to determine the suitable concentration of an…
A: Antibiotics, such as penicillins and cephalosporins, are a form of antimicrobial drugs that fight…
Q: If a bacterial culture is started with 50 cells, what will be the cell number after four…
A: Cultured bacteria are any bacteria that grow in the lab by the microbiologist using the required or…
Q: Suppose you performed a Gram stain from a pure culture of bacteria and observed a field of red and…
A: Gram staining is generally used in differentiating between two broad categories of bacteria called…
Q: In an experiment Staphylococcus, streptococcus and enterococcus are bacteria that are stained dark…
A: Introduction: The bacteria are classified on the basis of staining as gram-positive and…
Q: Why does transferring only some of the culture make it easier to see the effects of competition?
A: Transferring only some of the culture make it easier to see the effects of competition
Q: E. coli a gram negative bacteria have a flagella orientation covering over the entire bacterial…
A: Flagella is a hair-like feature that aids cell movement.
Q: True or False Exposure of bacterial cells to antibiotics: 50s is disrupted 60s is disrupted 80s is…
A: Organisms that have only one cell, are microscopic, and can exist anywhere(inside or outside the…
Q: PART B Re-watch the video and explain why the following steps are necessary: • Why use tweezers to…
A: Introduction Antibiotics are antimicrobial substances that are effective against microorganisms.…
Q: You are using bacterium E.coli to synthesize a protein from recombinant DNA. The protein remains in…
A: Escherichia coli is one among the organisms of selection for producing recombinant proteins. It's…
Q: you looked under a microscope and found colony of perfectly round bacteria, all in a straight line.…
A: Streptococci and staphylococcus are both in special shape and are bacterias but the perfect round or…
Q: Which of the following is false about a colony? O A colony is a population of cells formed from a…
A: The correct answer is E . A Colony is mixture of different bacterial cells Bacterial colony is a…
Q: The picture shows bacteria (Escherichia coli) under a microscope Do you bacterial growth or no (…
A: Culture media are an integral part of microbiology lab where bacteria can be grown on different…
Q: Consider the given bacterial growth curve (X axis is time, Y axis is log number of viable cells). At…
A: The number of live cells in a bacterial population over time is represented by the bacterial growth…
Q: In August 2021, there was a multi-state outbreak of melioidosis, an infectious disease caused by the…
A: In microbiology, there have different types of culture mediums that are commonly used to grow…
Q: Select the tube that you think best represents a successful transformation. Tube 1 Tube 2 Tube 3…
A: A Plasmid is a small and circular DNA molecule that is found in bacteria and other cells. Plasmids…
Q: Which of the following best explains why there is no growth on plate II? (a) The initial bacterial…
A: A "microbe" is a living entity that is so tiny that it cannot be seen with the naked eye.…
Q: If you are to invalidate the abiogenesis theory using Louis Pasteur’s experiment, how will you…
A: The oldest surviving terrestrial rocks, about 4.3 billion years old, contain no definite trace of…
Q: What hypothesis you can form as to why the vibro bacteria might survive better in colder…
A: Vibrio species constitute one of the most diverse genera of Gram-negative bacteria ubiquitously…
Q: Antibiotic resistant bacteria are commonly found in hospitals. Why do you think that is?
A: Antibiotic resistance occurs when bacteria develop the capacity to overcome the antibiotics created…
Q: Why is the top part of a broth or slant culture heated in a flame immediately after removing the…
A: The correct option is d. The top part of a broth or slant culture heated in a flame immediately…
Q: Bdellovibrio would be great to use to treat all human pathogens, but it cannot be used as biological…
A: Based on an experiment conducted in 1992 by Jackson and Whiting, Bdellovibrios is a potential agent…
Q: Which of the following statements best explains why there are fewer colonies on plate IV than on…
A: This question is based on transformation of bacteria. Bacterial transformation is a process of…
Q: When counting bacteria, the difference between the standard plate (STP) count and a direct…
A: Direct microscopic count It is quantitative method. It is used to estimate the actual number of…
Q: The term "Superbug" refers to? A. Certain bacteria strain that can grow in all kinds of unfavorable…
A: Introduction :- Superbugs are bacteria, viruses, parasites, and fungi strains that are resistant to…
Q: Which of the following is true about the bacteria pictured above? (Select all that apply.) O The…
A: Bacteria are ubiquitous, one celled , prokaryotic organism which does not contain true nucleus . It…
Q: Why are endospores particularly promlematic in the food industry? State two protocols the food…
A: To determine: Why endospores is problematic in food industry. Protocols to reduce endospore forming…
Q: Who formulated the hypothesis that certain chemicals could kill microbes without harming humans was…
A: Chemotherapy includes antibacterial medications that target infectious germs or treatments that…
Q: How does the streak plate technique help in isolating individual colonies of bacteria? Why streak…
A: NOTE: DUE TO MULTIPLE QUESTION POSTED, AS PER OUR GUIDELINES WE ARE ONLY SUPPOSED TO ANSWER THE…
Q: Look at these two plates. Which organism is most susceptible to antibiotics?
A: Q. Look at these two plates. Which organism is most susceptible to antibiotics?
Q: A scientist isolates a new species of prokaryote. He notes that the specimen is a bacillus with a…
A: The gram-positive and negative bacteria are classification system given based on gram staining…
Q: ntibiotics are medicines used to fight bacterial infections. These drugs kill prokaryotic cells…
A: Given: Antibiotics are medicines used to fight bacterial infections. These drugs kill prokaryotic…
Q: Experiment #1: Scientists thought beriberi might be caused by bacteria. They injected chickens with…
A: In case of any scientific experiment the selection of experimental and control groups are very much…
Q: How Penicillin Was Discovered In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria…
A: Penicillium is an important genus of phylum Ascomycota from which an important antibiotic is…
Q: Imagine that you are asked to design a surface (BUT ONLY SURFACE) pasteurization process of eggs.…
A: The process by which the pathogenic microorganisms are destroyed from certain food items is called…
Q: We use salting and freezing to preserve our food against bacteria. Explain why is food preserved…
A: Food preservation refers to the practices of food processing that reduce the deterioration of food…
Q: If the generation time of Escherichia coli is 30 minutes, starting with 4 E. coli cells, how many…
A: E. coli divides by binary fission. It is a type of asexual reproduction by which they reproduce and…
Q: Suppose you performed a Gram stain from a pure culture of bacteria and observed a field of red and…
A: Gram stain is a common method useful to differentiate two large groups of bacteria based on their…
Q: Which of the following is the most important structure related to microbial attachment?…
A: Bacteria are single-celled prokaryotes ubiquitous in nature. As such, they can be found in different…
Q: TRUE or FALSE E. coli would have a pink mucoid colonies
A: A differential medium is a culture medium that is capable of differentiating two types of bacteria…
Q: There are many antibiotics that target the bacterial cell wall, but there are few antibiotics that…
A: The antibiotics are medicines that help stop infections caused by bacteria.They do this by killing…
Q: Which of the following is true of the bacteria pictured above? (Select all that apply.) The bacteria…
A: According to guidelines we have to answer the first question only. so please kindly post the…
Q: What is a cfu? • The average number of plasmids contained by a bacterium. • A single bacterium…
A: Introduction A CFU is defined as a single, viable propagule that produces a single colony, It is the…
Step by step
Solved in 2 steps
- A SAB agar plate is exposed to air for 30 minutes and then incubated. The 10 colonies which grew on SAB plate are most likely both yeast and mold colonies yeast colonies only bacterial colonies only fungal, bacterial, and protozoal coloniesSuppose you spilled two cultures of Salmonella typhimur-ium (each containing 100,000 cells) on your lab bench. You im-mediately applied the same disinfectant to both cultures at thesame time. One culture had been freshly grown for 36 hours andthe other culture is 2 weeks old. If the kill ing rate of the disin-fectant is 90% per minute, do you think that microbes in bothcultures will be completely killed after 6 minutes? Why or whynot?You have a culture that has 5 X10³ cfu/ml of bacteria in it. You perform a serial dilution by adding 1 ml of the stock in 9ml of TSB in Tube A and mix. You then take 1 ml from Tube A and add it to 9 ml of TSB in Tube B and mix. Last you take 1 ml from tube B and add it to a TSA plate. After overnight incubation, you count the colonies you see. How many colonies will you see? a) 5000 b) 500 c) 50 d) 5 e) .5
- I completed the chart, and I'm supposed to figure out the unknown bacteria, there are 12 unknown culture, out of which of them resemble my chart the most? (My chart is the one in pink with the information filled out)Select the tube that you think best represents a successful transformation. Tube 1 Tube 2 Tube 3 Tube 4 O Plasmid Bacterium O Tube 1 O Tube 2 Tube 3 O Tube 4What is [are] good reason[s] for plating a mixture of bacteria so as to form colonies? Select all that apply. Group of answer choices Count the number of dead and live bacteria in the mixture Count the number of bacteria in the mixture that can grow on the plate Get lots of copies of all the cells in the mixture
- A bacterium that can form endospores likely has the ability to; withstand high temperatures resist at least one antibiotic share DNA with other bacteria form conjugation tubesWhy are agar plates incubated upside down? 12pt v Paragraph U A vYou want to identify whether a patient in the hospital has an infection caused by Staphylococci or Streptococci. How could you go about figuring this out? O You do a catalase test as most Stapholycoccus are catalase positive and most Streptococcus is catalase negative. O You do a Gram stain and check if the cell structure is a grape cluster of cocci or a string of cocci/ pairs of cocci. O all of the above
- Microbiologists announced the discovery of over 30 new species of bacteria that thrivebetween the teeth and gums of humans. The bacteria could not be grown in the researchers’ laboratories,nor were any of them ever observed via any kind of microscopy. If they couldn’t culture them or see them,how could the researchers know they had discovered new species? If they couldn’t examine the cells for thepresence of a nucleus, how did they determine that the organisms were prokaryotes and not eukaryotes?What is the purpose of fixing a smear? Mark all that apply: To kill the bacteria so they aren't harmed by the staining method O To kill the bacteria to make the slide safer to handle O To attach the bacteria to the slide To break down the cell wall in order to make the cells accept stain To cause the cells to shrink and become distorted Microsoft Bing 11:30 AM do 87 F Sunny 9/14/2021The first step for directly linking a microbe to a specific disease according to Koch's postulates is to O isolate microbes from the blood of healthy animals. obtain a sample of blood or other body fluid from a diseased animal. O culture the blood or other body fluid from a discased animal using nutrient medium. O inject a sample of blood or other body fluid from a diseased animal into a healthy animal. O compare the blood of a sick animal to blood obtained from a healthy animal.