Category: Biology

https://learn.chm.msu.edu/vibl/vibl/Catalase/catalase_HTML5Canvas.html
Above is the link to the lab. Worksheet_Catalase Test
Name:
Table 1. Results of catalase tests using two Gram positive cocci
Bacterial species
Bubbling
Catalase Test (Positive/Negative)
1
Streptococcus pyogenes
2
Staphylococcus aureus
Critical Thinking Questions:
1. What is the purpose of the catalase test?
2. What kind of bacteria produce catalase?
3. Why does a bacterium produce catalase?
4. What are the bubbles observed in a positive reaction?
5. If a bacterial strain is catalase positive, is it always an obligate (strict) aerobe? Explain.
6. If a bacterial strain is catalase negative, is it always an obligate (strict) anaerobe? Explain.
7. If a bacterial strain is an obligate (strict) aerobe but catalase negative, what enzyme does the bacterium may use to detoxify H2O2?

In Unit 1, we have studied:
Male and Female Reproductive Systems
Human Development
Stem Cells
Cloning
Genetics
Epigenetics
Choose one of the above topics and find an article in a reputable news source (e.g., Newsweek, Time, U.S. News & World Report) that reports on a new advance in this area; such advances could be new hormone therapy, new gene therapy tests, new sources of stem cells, etc. Once you have found your article, write an essay that summarizes the article, connects it to the material you have learned in Unit 1, and include your personal opinion about the new advance.
Your paper should be well written, free from grammatical and spelling mistakes, and should be your own original work (no plagiarism). Your paper should be between 2 and 3 pages (double spaced, 12 font). Please title your essay with your last name and essay 2 (like this, BloomEssay2). Submit your finished essay to the Turnitin link provided below.
I have chosen the topic Stem cells

Amidst extensive research already spotlighting an increase in new cancer cases among younger individuals, groundbreaking studies are now examining cancer patterns among diverse racial groups.
For instance, a new study seeks to investigate which factors might contribute to the disproportionate diagnosis of late-stage cancers and increasing mortality rates among American African women despite a decline in mortality rates in the past ten years. One such study, the first of its kind, aim to address this disparity by enrolling over 100,000 African American women a group traditionally underrepresented, in medical research. Another study investigated the possible connection of personal care products and chemical exposures across a diverse racial groups, including African American, Latina, Vietnamese, Mixed race, and White women in California.
Share your thoughts on how the significance of these findings and the investigation into chemical exposure play a role in reducing inequalities in cancer diagnoses in women particularly AA women whose mortality rates are increasing and other racial groups as described in the articles below. What other factors might be contributing to these disparities? Is it chemical, biological or both. socioeconomic, etc. See related articles or you can do your own research.
1. Personal care products use by race/ ethnicity
https://www.nature.com/articles/s41370-021-00404-7
2. Hazardous ingredients in Person Care
https://www.cdph.ca.gov/Programs/CCDPHP/DEODC/OHB/CSCP/CDPH%20Document%20Library/DataReport2023.pdfLinks to an external site.
3.Environmental Racism NIEHS National Institute of Environmental Health and Sciences

4. Hazardous Ingredients in Personal Care
https://pubmed.ncbi.nlm.nih.gov/38757092/
5 How Racialize Beauty Norms motivate the use of toxic Beauty products among women of color
https://www.publichealth.columbia.edu/news/how-racialized-beauty-norms-motivate-use-toxic-beauty-products-among-women-color
6.Chemicals of concern in products used by women of color
https://www.nature.com/articles/s41370-022-00485-y

Explore your local ecosystem and find examples of all of the interactions listed below. Document your observations with photographs. You will be sharing your pictures with a sentence description of the interaction. Even in urban habitats, you should be able to see these interactions (think creatively- house plants? pigeons?)! Life does not stop at city boundaries and organisms use these spaces as habitats. Many scientists study the unique ecological communities within urban areas with diverse research topics ranging from how urbanization affects organism distribution over space and time, how it shapes their basic biology and their species interactions, and how best to incorporate ecological needs into future city design. To view some examples for inspiration, check out this collection of the journal PLOS research articles focused on urban ecologyLinks to an external site.. Interactions you need to find:
Symbiosis (either mutualism or parasitism- specify which you are documenting)
Exploitation (either predation or herbivory- specify which you are documenting)
Competition (either interspecific or intraspecific- specify which you are documenting)
An indirect interaction
At the end of your exploration, draw a web connecting the organisms you found. On the lines connecting each organism, use a + or – symbol to demonstrate if the interaction is positive or negative for each organism. This web can either be digital or hand-drawn. If you choose to create a digital diagram, you can use any program such as Google Slides to create your web. You could also consider using Diagrams.netLinks to an external site. as a tool to organize your web.
Each diagram should be accompanied by a written list of sentences describing each interaction.
If you do not incorporate your photographs into your web, include them at the end of your initial post.
My ecosystem has to be based in West Virginia.

You serve on a committee for a charitable foundation that
will vote and decide how to fund grant requests for research on specific
diseases. This research could lead to better understanding of disease
mechanisms or new therapies/interventions. The applications for the grants have
been narrowed down to three choices.
Out of these choices, you
may only choose one to vote for:
1. Fibrodysplasia ossificans
progressiva
2. Myasthenia gravis
3. Huntington’s disease 
you will state your choice, explain the normal anatomy of
the system the disease impacts the most, explain how the disease disrupts this
system, and why you chose to vote this way using appropriate and sufficient
evidence.
·     
Length: 250-500
words
·     
12pt
font
·     
All
sources (three required not including your textbook, which must also be
cited if you use it) must be properly cited (see APA source citation below)
·      State and explain your choice. When stating
the evidence, consider the challenges that others may have to your evidence and
how you could counter those respectful challenges.
APA Source Citation
You must use at
least three reputable scientific references to support your post (not
including your textbook- if you use your textbook, you must also cite it).
Reputable sources= peer reviewed scientific journal articles, accredited
websites, or books. Google, Wikipedia, etc. are not acceptable sources.

In my microbiology lab I grew Staphylococcus epidermidis on my Mannitol Salt Agar (MSA) plate by inoculating the agar with a sample containing the bacteria and incubating it at an appropriate temperature for growth. MSA is both a selective and differential medium. To confirm the identification, I performed a Gram stain, which showed Gram-positive cocci, and a catalase test, which was positive. I identified the bacteria as S. epidermidis because the colonies grew but did not turn the medium yellow. This lack of yellow coloration indicates that the bacteria did not ferment mannitol, a key characteristic distinguishing S. epidermidis from other Staphylococcus species like S. aureus, which does ferment mannitol and turns the agar yellow. I need to write a 6 page research paper including material such as General information about the bacteria and I attached more files with more details. Can it be good for us?

Hi, There are 2 assignments from the same chapters but based on different topics. Unit 1.8,  and 1.9 has the questions of the assignment. I have also attached other pdfs that contain contents from the topic that you may need to complete the assignment. Please write the homework in APA Style where needed. And please provide citations and references where it is asked for.

The image below shows a picture of a cell in a light microscope. The total magnification of the cell is 450X. The ocular lenses were at 5X.
Based on the information provided, what was the magnification of the objective lens? (1 point)
What would be the total magnification of the cell if the objective lens was moved to 150X but the ocular lens was still the same (5X)? (1 point)
Look at the cell diagram shown below.
What cell type is this? Is it prokaryotic OR is it eukaryotic? How do you know? (2 points)
This cell was previously classified as a plant cell – but is now in its own category. What features does it have that led scientists to believe that this was a plant cell? (2 points)
This cell is no longer classified as a plant cell. What features are missing from this cell that are found in plant cells. (2 points)
Look at the images of the solutions shown below.
Of the three images (left, middle, right), which image shows a hypotonic extracellular fluid? (Hint: extracellular means outside the cell. extra ＝ outside). (1 point)
Of the three images (left, middle, right), which image will result in NO NET CHANGE of the cell’s size? (1 point)
Of the three images (left, middle, right), which image will result in a crenated cell? (Hint: crenated cells look shriveled). (1 point)
Of the three images (left, middle, right), which image shows a hypotonic intracellular fluid? (Hint: intracellular means inside the cell. intra ＝ within) (1 point)
Is this set of images displaying osmosis OR is this image displaying selective permeability? (You can answer this question if you have watched my videos explaining the differences). (3 points)

Write an 8-10page paper on Epidermolysis Bullosa. This should include the nature of the genetic mutation(s) behind the disease, Mendelian inheritance pattern, symptoms, diagnosis, prognosis, and the mechanism and symptomology of the resulting syndrome. Additionally, cover the availability and use of animal models for research, current treatments, prospects for DNA-based diagnosis and/or treatment by gene therapy, and the bioethics associated with the disease.

What you’re doing:
You will be using your purchased kit for growing algae for this particular assignment and preparing a laboratory notebook style write up. That will include an aerator, algae, culture vessel, and secchi disk. This is a low cost method for you to actually raise a viable live feed. Students will culture this species and document this in an online lab book and create a short reflection on the relevance of this experience.
Why you’re doing it:
This particular assignment relates to the course project in planning for the larval cycle of a finfish or if doing molluscs culture planning for larval nutrition.
What you need to know:
Before beginning this assignment, reflect on the positives and negatives of growing a live feed. Review Chapter 9.1.2 Microalgaes from the textbook (Aquaculture: Farming of Aquatic Animals and Plants). In this chapter they discuss culture methods and commercial production of algaes. 
(1) Algae Culture Kit and Growing SuppliesLinks to an external site.
(2) Secchi StickLinks to an external site.
This kit will include the method and supplies for anyone to grow Nannochloropsis an ecologically and industrially important strain of algae. It contains everything you need to grow a laboratory-grade culture at home or at your desk! It includes the following:
Instructions: information about the strain of algae, illustrated growing protocol, culture care lessons, life-cycle background of batch-culture cycles.
Culture flask: tissue culture flask (50 ml volume) with a breathable cap (included in the smallest kit only)
Culture inoculum: 1ml in a dense culture in a 1.5ml micro-centrifuge tube.
Nutrient Fertilizer: our nutrients are a modification of the media formula called f/2 (Guillard and Ryther 1962, Guillard 1975). It uses NaNO3 (sodium nitrate) and NaPO4 (sodium phosphate) as the nitrogen and phosphorus sources.
Culturing Salts: Add salts to a 500ml bottle of drinking water (water not included in the kit).
Using the directions from the kit you will set up the nutrient salt water
Instructions:
Students will culture  and provide evidence they have set up and cultured the organisms via an online lab notebook that they create. 
Section 1 picture of set up
Section 2 description of methods in step-by-step bullet points and variables related to algae growth(light provided, water type, salt, etc).
Students will measure the density of their algae cultures with a secchi disk by day and present data in table format. This is the best way to measure (turbidity) and a way to extrapolate cell density overall.
Students will reflect in a lab notebook conclusion on the use of this species of algae and its relevance to aquaculture.
This assignment will help you on the course project with thinking about your species profile and considering the larval nutrition stage of your culture or any special requirements needed for live food culture. Will your organism require a live feed at any stage of their life cycle? If not what feed is required for each stage. 
Rubric
Week 4 Assignment I: Growing a Live Feed
Week 4 Assignment I: Growing a Live Feed
Criteria Ratings Pts
This criterion is linked to a Learning OutcomeSet Up
Students will provide a picture of their set up.
10 pts
This criterion is linked to a Learning OutcomeMaterials and Methods
Students will describe their set up and all the variables they are trying to control for
10 pts
This criterion is linked to a Learning OutcomeResults of Their Live Algae Grown
Students will construct a data table by day that shows the density of their algae cultures with accompanying pictures as they grow.
20 pts
This criterion is linked to a Learning OutcomeConclusion
Students will formulate a conclusion and reflect on this experience addressing the role of live algae cultures in aquaculture.
30 pts
This criterion is linked to a Learning OutcomeSources
Outside sources relevant to the discussion are utilized and cited using APA style.
10 pts
This criterion is linked to a Learning OutcomeConventions of Writing
Uses correct grammar, appropriate terminology, and spelling.
10 pts
Total Points: 90