Answer:
Explanation:
Lymphatics join up to form up larger lymph vessel than gradually transport the lymph back to the large veins that run just beneath the collarbone called the subclavian veins.
Answer:
The scientist's conclusion is most likely unreliable because he just interviewed people watching movies in the theatre. He should have interviewed an equal number of people from the theatre and from home to get reliable results. According to the scientific method for designing an experiment, the experiment or survey conducted by scientists is not correct. Hence, the scientist's conclusion is wrong because his method of experimentation was wrong.
Answer:
the end or close; final part. the last main division of a discourse, usually containing a summing up of the points and a statement of opinion or decisions reached. ... final decision: The judge has reached his conclusion. a reasoned deduction or inference.
<h2>Differential test</h2>
Explanation:
A differential test helps to distinguish that which species lack or have the particular biochemical process,the three differential test media are:
1) Blood agar: Blood Agar is an enriched medium which is used to culture those bacteria or microbes that do not grow easily
- It is also required to detect and differentiate haemolytic bacteria, especially Streptococcus species
- It is also a differential media in allowing the detection of hemolysis (destroying the RBC) by cytolytic toxins secreted by some bacteria, such as certain strains of Bacillus, Streptococcus, Enterococcus and Staphylococcus
2) Eosin methylene blue agar (EMB): It is a selective and differential medium used to isolate fecal coliforms
- Eosin methylene blue are pH indicator dyes which combine to form a dark purple precipitate at low pH; they also serve to inhibit the growth of most Gram positive organisms
- Sucrose and lactose serve as fermentable carbohydrate sources which encourage the growth of fecal coliforms and provide a means of differentiating them
3) Mannitol Salt Agar (MSA): It is a selective and differential medium
- The high concentration of salt (7.5%) selects for members of the genus Staphylococcus, since they can tolerate high saline levels
- Organisms from other genera may grow, but they typically grow very weakly
Three examples of tests which are done on colonies are:
1) Catalase test: Catalase is an enzyme that breaks hydrogen peroxide (H2O2) into H2O and O2
- Hydrogen peroxide is often used as a topical disinfectant in wounds, and the bubbling that is seen is due to the evolution of O2 gas
- A small amount of growth from the culture is placed onto a clean microscope slide
- Few drops of H2O2 onto the smear is added
- A positive result is the rapid evolution of O2 as evidenced by bubbling
- A negative result is no bubbles or only a few scattered bubbles
2) Indole test: The main requirement for a suitable indole test medium is that it contain
s a sufficient amount of tryptophan
- Tryptone broth is commonly used
- The tube of tryptone broth with a small amount of a pure culture is inoculated
- Incubation is done at 35°C (+/- 2°C) for 24 to 48 hours
- To test for indole production, 5 drops of Kovács reagent is directly added to the tube
- A positive indole test is indicated by the formation of a pink to red color in the reagent layer on top of the medium within seconds of adding the reagent
- If a culture is indole negative, the reagent layer will remain yellow or be slightly cloudy
3) Urease test: Urease is a constitutively expressed enzyme that hydrolyzes urea to carbon dioxide and ammonia
- The urease test identifies those organisms that are capable of hydrolyzing urea to produce ammonia and carbon dioxide
- Urease test media contain 2% urea and phenol red as a pH indicator
- An increase in pH due to the production of ammonia results in a color change from yellow (pH 6.8) to bright pink (pH 8.2)
- Urea broth is a highly buffered medium requiring large quantities of ammonia to raise the pH above 8.0 resulting in a color change
Answer:
The type of pollution demonstrated is sediment pollution.
Explanation:
- Sediment pollution is the deposition of waste products in rivers, lakes and streams by the means of soil erosion.
- So in the abandoned construction site, sediment pollution is the major issue that causes the environment's wind and water to pollute heavily.
- The waste is swept and carried to different places that pollutes the environment badly due to the exposed construction site.
