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Tresset [83]
3 years ago
10

A scientist is examining an organism that feeds on decaying matter to gain energy for survival. What kingdom would be the best o

ption when classifying this organism? Animalia Archaea Fungi Plantae
Biology
2 answers:
Tresset [83]3 years ago
8 0
The correct answer is fungi because fungi are organisms that survive on decomposing organisms

egoroff_w [7]3 years ago
3 0

The correct answer is C. Fungi

Explanation:

Fungus (singular for fungi) refers to a kingdom that includes organisms such as molds, mushrooms, and yeast characterized by being heterotrophs, and decomposers. This means different from plants they cannot produce energy but need to absorb external substances. Additionally, they are decomposers because they break down decaying matter such as dead animals and it is in this way they obtain nutrients, and energy. Moreover, fungi are the main decomposers organisms, although some bacteria are decomposers. Therefore, the scientist should classify this organism as Fungi considering the organism he examined feed on decaying matter and therefore is a decomposer, while others such as plants, animals, and most archaea are not decomposers.

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Primary producers are the basis for all aquatic and terrestrial food webs. how does the amount of primary production affect comm
krok68 [10]
It will die

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6 0
3 years ago
Biochemical and differential tests can be incorporated into growth media or performed on isolated colonies after they have been
Cloud [144]
<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
4 0
3 years ago
There’s supposed to be 9 on each side and 6 in the middle. Which one did I mess up that was supposed to be in Mitosis?
Genrish500 [490]
The incorrect one in the Meiosis category would be,

"Same number of chromosomes as the original cell." 

This is because the original cell would've had 46 chromosomes but the new cell only 23.
8 0
3 years ago
The intercellular material that holds plant cells together 1 cell cement 2. A septum which forms to separate the two new plant c
notsponge [240]

Answer:

1. The intercellular material that holds plant cells together (Cell Cement)

2. A septum which forms to separate the two new plant cells (Cell plate)

3. Material which makes up the structure of the cell wall (Cellulose)

4. play a role in the formation of the spindle during cell division  (Centrioles)

5. Serves to trap the sun's energy for photosynthesis  (Chlorophyll)

6. A packet of chlorophyll arranged in stacks within a plant cell (Chloroplast)

7. The pinching in of the animal cell during cell division (Cleavage furrow)

8. The new cells resulting from the division of the mother cell (Daughter cells)

9. channels for transporting molecules within the cell (Endoplasmic reticulum)

10. The reproductive cells in sexual reproduction (Gametes)

11. Involved in producing and packaging secretions (Golgi Bodies)

12. The process involving the division of the nucleus in a reproductive cell (Meiosis)

13. The process involving the division of the nucleus of a body cell (Mitosis)

14. The cell that is about to undergo binary fission (Mother cell)

15. Makes up the structure of the ribosomes (rRNA)

16. Substances produced by the Golgi bodies (Secretions)

17. The fibers which direct the even distribution of chromosomes (Spindle)

Explanation:

Plant cells: (1,3,5,6)

Plant cells differ from animal cells in several ways.

<em><u>Cell wall:</u></em> One of the most defining one is plant cells have cell walls. These cell walls are rigid and they cover the plasma membrane of the plant cell. Cell walls have 3 layers and the outermost one is called the middle lamella, which is the cell cement. It acts like a cement because it is what holds one plant cell and the adjacent cells together. The middle lamella is made up of pectin.

The cell wall also has layers made up of <em><u>cellulose, </u></em>which happens to be a macromolecule as is the most abundant of its kind on Earth. They form bundles called microfibrils.

<em><u>Chlorophyll: </u></em>Chlorophyll are molecules found in plant cells that play a role in food production in plants. Chlorophyll absorbs sunlight which is used in the process of food making called photosynthesis, along with other elements like water and carbon dioxide. Also chlorophyll gives the green pigmentation of plants.

<u><em>Chloroplast:</em></u> Chlorophyll are encased in an organelle called chloroplast. Chloroplasts are where photosynthesis takes place. They are found in the leaves of plants. Because they use chlorophyll, the are also green.

Other parts of a cell: (4, 9,11.15, 16, 17)

Both plant and animal cells also have similar organelles.

<em><u>Endoplasmic Reticulum (ER):</u></em> There are two types: smooth endoplasmic reticulum(SER); and rough endoplasmic reticulum(RER). The SER acts like a storage unit for lipids and steroids. They also help in the production as well. RER is a pckaging and synthesis area. It is rough because they have ribosomes on them.

<em><u>Ribosomes:</u></em> Ribosomes are small organelles in the cell that are partly made up of rRNA or ribosomal RNA. They play an important role in protein synthesis. They help translate the DNA code that the mRNA transcribed to determine what type of protein will be formed.

<em><u>Golgi Apparatus:</u></em> Also known as the golgi complex, is an organelle in the cell that serves as a sorting and packaging area. It collects simple molecules and packages them into more complex molecules which would be stored if the cell would need it, or it will be sent out of the cell. These complex molecules are packed into vesicles. A transition vesicle is made from the protein in the ER is transported to the golgi apparatus, which then processes its contents. It then releases a secretory vesicle, that is then brought to the cell membrane.

<em><u>Centrioles: </u></em> Centrioles are small, cylinder-shaped organelles that aid in cell division. They are made up of the protein, tubulin. These centrioles produce <em><u>spindles </u></em>or spindle fibers that pull on the chromosomes during cell division and split them up.

(CONTINUED IN THE ATTACHMENT)

3 0
3 years ago
You plate a unit sample of progeny phages on E. coli strain B and observe 30,000 plaques. How many plaques total were produced b
meriva

Answer:

30, 000 plaques.

Explanation:

Plaques may be defined as the clear zones or spots that indicates the lysis of the bacteriophages. These plaques are useful to count the number of progeny phages.

The formula used to calculate the phage is as follows;

Plaques progeny = [Number of plaques observe/(Dilution factor x Volume of diluted virus)]

Since, in the given question the dilution factor and volume is not given and it can be taken as unity.

Plaques progeny = 30, 000 / ( 1 x 1)

Plaques progeny =  30, 000.

Thus, the answer is 30, 000.

7 0
3 years ago
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