When the number of colony-forming units per milliliter is calculated, you will focus your counts on the Petri plates with __________.   A. 5 to 25 colonies B. 25 to 250 colonies C. 250 to 500 colonies D. TNTC colonies E. any number of colonies

Q: 1. A plate with a final dilution factor of 107 produced 210 colonies. a) What was the original…

A: Dilution is the process of diluting or mixing two or more substances or compounds; it is also known…

Q: A student was observing a filament of blue green bacteria under low power (60X). The diameter of the…

A: A. Average length of one cell = 2.4 mm/ 40=0.06 mm Under 60X = 40 cells, each is 0.06 mm in length

Q: If a food product has 10^9 bacteria, is heated at 50°C, and crosses the X-axis at 90 min (90 min is…

A: Answer is none of the above. Take 10 min to sterilize the food product.      For calculating it, we…

Q: The micrograph below shows a(n...

A: Pancrease is a heterocrine or mixed gland. It consists of the exocrine and endocrine part. Exocrine…

Q: During two-dimensional gel electrophoresis, proteins are separatedbased ona. their net charge at a…

A: Gel electrophoresis is a separation technique used in biotechnology and other research domains to…

Q: Bacteria tend to stain more readily with cationic (positively charged) dyes because bacterial…

A: Bacteria are the most important microorganisms to the food processor. Some bacteria are beneficial…

Q: You perform a Gram staining technique on two bacterial species and observe that one is stained…

A: Gram staining is a technique used to differentiate between two groups of bacteria namely…

Q: For a successful direct staining, one should A. use a minimal amount of water to speed up the…

A: Direct staining is the process to make slides using a single stain or dye.

Q: Dyes are used to stain specimens that will be observed using the microscope to   a.  increase the…

A: Ans (d) : Dyes are used to stain specimens that will be observed using the microscope to make it…

Q: Why did the gelatin tubes have to be moved to 4C before analysis? a. If gelatinase was produced the…

A: Gelatin is a protein derivative obtained from animal collagen. A gelatin test is performed in…

Q: 1. Cell shape and arrangement in A? 2. Gram stain reaction in A? 3. Cell shape and arrangement in…

A: staining is the technique to view the bacterial cells in a smear of inoculum. Gram staining is the…

Q: In hybridization method, which of the following is pressed onto agar?a) Silicon paperb)…

A: Hybridization method is a standard technique in the molecular biology. Hybridization is the…

Q: UV light is able to damage bacterial cells by:a. preventing mitosis b. damaging DNA c. dissolving…

A: UV stands for Ultraviolet rays. These rays kill bacterial cells.

Q: Celery stalks that are immersed in fresh water for several hours become stiff. Similar stalks left…

A: Membrane transport is the movement of substances across biological membranes. These substances,…

Q: When the number of colony-forming units per milliliter is calculated, you will focus your counts on…

A: Petri dish or cell culture dish is used to grow microbial cultures such as bacteria and fungi. The…

Q: You have a yeast cell stock in a flask. The total volume is 10mL. After counting and calculation,…

A: The square count method is done with a hematocytometer.

Q: In the petri dish in Figure 1, the bacteria Esherichia coli (E. coli) was grown and treated with…

A: The disk diffusion technique is used to estimate the susceptibility of the organism to a particular…

Q: a) What is Gram staining?     b) Describe step by step the procedure     c) Explain the basis of…

A: GRAM STAINING METHOD:- This is a differential staining that was developed by Dr. Hans Christian Gram…

Q: a. After conducting the Gram staining procedures and you observed that all cells are stained with…

A: The microorganisms that can be found in several areas of the habitat and come under the category of…

Q: Bacteria tend to stain more readily with cationic (positively charged) dyes because bacteria a.…

A: Bacteria are stained by positive and negative dyes.

Q: When viewed under a microscope, bacteria appear as red rods after they have been stained. Explain a…

A: Introduction Bacteria Are Minute, Single-celled Organisms That Can Be Found In Large Numbers In All…

Q: 1. The physical factor influencing water entry into and exit from cell interior resulting in…

A: Introduction A pathogenic bacterium, or microbial cell, is a living entity that is too small to see…

Q: 1.You are given an unlabeled agar plate that is reddish in color. You do not know if it is MSA or…

A: The study of all living creatures that are very small, cant be seen by the naked eye is known as…

Q: If your sample material is large and difficult to work with as a whole (e.g. leaf, muscle tissue),…

A: Typically, a sample is the approximate value of an object that is intended to be identical and…

Q: Fluorescent proteins are a useful tool in the biomedical scientist's toolbox because, a.they can be…

A: Fluorescent proteins belong to a structurally homologous class of proteins that have the unique…

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: Write a conclusion: Discuss the possible cause (s) for food dyes to spread to form distinct areas…

A: Diffusion is a process of movement of substance from higher concentration to lower concentration.…

Q: 5. Why is it necessary for the specimen to be thin when observed under the microscope? A. so that…

A: Since there are multiple question in this particular question, I will answer the first one for you.…

Q: Answer the following: 1. Genomes with DNA-DNA hybridization value of 68% belong to the same…

A: DNA-DNA hybridization technique: it is used to determine the sequence similarities between one known…

Q: those in a loaf made using normal yeast?   A. more bubbles    B. differently-shaped bubbles   C.…

A: The breakdown of carbohydrate under anaerobic condition is referred to as fermentation. During…

Q: When you see mold on a slice of bread,you are seeing a single cell of mold. A.True B.False

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Q: You plate 100 uL of a bacterial culture on an LBA plate and incubate for one day at 37 degrees…

A: We have been provided the volume of bacterial culture plated on an LBA plate to be 100 μl. This is…

Q: All of the following are valid measurements of growth except: A. Counting viable cells B.…

A: Use the general formula: [Number of colonies counted] × 10 × [how many times the sample must be…

Q: Need help Which of these could be used to measure the number of live bacterial cells in a liquid…

A: Bacterial cultures are used to grow the bacteria in a specific environment. A bacterial culture…

Q: (a) (i) In which concentration of salt solution did the chip gain mass? (ii) Explain why the chip…

A: A solution contains a solute and a solvent. The solute is the substance that is dissolved and…

Q: You have 1 ml of kombucha. You remove 0.1 ml of this and mix it with 9.9 ml of fresh tea. You mix…

A: The following formula is used for finding the calculation of concentration of bacteria: CFU/ml =…

Q: Comparing the different methods for counting bacterial cells, which of the following is FALSE? A.…

A: Prokaryotes are those organisms which lack a membrane bound nucleus. They consist of eubacteria and…

Q: 3. Some pieces of bread were placed in different conditions as shown inhe table below. Bread…

A: Moulds are the type of fungi growing on the bread. Spores present on the surface of moulds…

Q: A culture starts with 8600 bacteria. After 1 hour the count is 10, 000. A. Find a function the…

A: Bacteria are prokaryotic organisms that are devoid of cellular organelles like endoplasmic reticulum…

Q: When Miescher added the alkaline solution, the cells lysed. What does this mean?   A. They…

A: Friedrich Miescher was a Swiss doctor who was conducting an experiment to study the chemical…

Q: . If you had conducted Benedict's test on the samples at time 0 minutes, what results would you…

A: Benedict's test is a chemical procedure that may be performed to determine if an analyte contains…

Q: A doctor is performing a study under a very powerful microscope and records the following…

A: The fungus is the heterotrophic organism such as mushrooms and moulds and they depend on others for…

Q: Examine figure a, b (shown here). If you performed the quadrantstreak plate method using a broth…

A: Isolation involves the separation of individual microbes and achieving isolated colonies that can be…

Q: Image A: Image B: 25 um O A. image A- scanning electron microscope, Image B- phase contrast…

A: Scanning electron microscope (SEM): It produce the image of the surface area by scanning with the…

Q: (a) if it is found that the number doubles in 6 hours, how many may be expected at the end of 18…

A: Bacteria are microscopic organisms not visible to the naked eye. These are omnipresent (they are…

Q: If one of the B galactosidase genes gets an insertion into the MCS the B galastosidase gene will not…

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Q: Is organism 1 a plant animal or neither explain  what procedure would you used to perform test A…

A: Plants and animals have several distinctive features. among them, the presence of DNA is a key…

Q: Why Are Cells Small

A: According to bartleby guidelines when multiple questions are posted we are allowed to answer the…

Modes of Nutrition

It is a biological process of providing or obtaining food that is necessary for growth and health. It includes many physiological processes - absorption, ingestion, assimilation, catabolism, excretion, etc. In biology, the science that deals with nutrition's physiological and chemical processes are called "nutritional science."