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Nookie1986 [14]
3 years ago
9

If a bunch of keys represents a cell, what does each key in the bunch represent?

Biology
2 answers:
Lina20 [59]3 years ago
5 0

The correct answer is option B a molecule.

Cells are the basic structural and functional units of living organisms. If a bunch of keys represents a cell, each key in the bunch represents a molecules. The levels of organization in an organism is as follows.

atom ⇒ molecule ⇒ cell ⇒ tissue ⇒ organ ⇒ organ system ⇒ organism.

Molecules represent the keys in a key bunch. A molecule is made up of one or more atoms held by chemiclal bonds. A cell is made up of various biomolecules. The cell wall consists carbohydrates, cell membrane consists of fats and proteins, the cytoplasm of the cell consists of water molecules, proteins, fats, carbohydrates and the nucleus has the biomolecules called the nucleic acids. Thus, many such biomolecules make up a cell.

viktelen [127]3 years ago
3 0
I THINK it could be an atom, but im not too sure
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The rabbit population would expand because the fox is a predator
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14. What is the carbon cycle?
77julia77 [94]

Answer:

Carbon Cycle: the series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.

Explanation:

8 0
3 years ago
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Which is the main reason cells are replaced in the body?. The cells are too large.. The cells are inactive.. The cells are damag
anygoal [31]

The right answer is The cells are damaged.

Take the example of skin cells.  

The skin consists of two tissues:

* the outermost, the epidermis, resting on a vascularized connective tissue,

* the dermis.

In the epidermis, which includes several layers of cells, the outer layer is formed of dead cells that are desquamating and are constantly being replaced from proliferating basal cell cells. So, in normal conditions, the epidermis is in constant renewal.

On the other hand, when accidentally, the upper parts of the epidermis are damaged, for example, a slight abrasion or of a burn, the destroyed portion is regenerated (replaced) thanks to an accelerated proliferation of basal epidermal cells .

7 0
3 years ago
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Briefly describe how amniocentesis and chorionic villi sampling are used in genetic screening.
bearhunter [10]

Answer:

Amniocentesis is an invasive method that involves the aspiration of 10-20 ml of fetal water through the abdominal wall under ultrasound-guided control. In most cases, the procedure is performed around the 16th week of gestation. The fetal water sample contains fetal cells, mostly cells of fetal skin and the epithelium of the urinary tract.

Chorionic Villus Sampling (CVS) biopsy is performed between weeks 11 and 12 of gestation. During biopsy, with ultrasound guidance, the tissue of the chorionic fossa is aspirated mainly across the abdomen (transabdominal pathway). The biopsy specimen is of fetal origin and belongs to the outer layer of blastocyst cells or the trophoblast (outer layer of the placenta). Very often, the biopsy specimen contains tissue of the decidua (mucous membrane of the uterus) that is of maternal origin, and it is necessary to remove the maternal tissue before any treatment of the sample.

Explanation:

The amniocentesis procedure carries a risk of miscarriage of 0.5-1%.  After aspiration of the fruit of the water, the sample is centrifuged to separate the cells from the amniotic fluid. Separate cells are seeded on a nutrient medium (cell culture) that stimulates cell growth. After about 14 days, the cell culture is further used for various genetic or biochemical analyzes such as karyotyping.

The advantage of chorionic biopsy is the amount of biological material, which is sufficient for the whole a number of different laboratory procedures. Also, a great advantage is the timing of the procedure as it allows diagnosis in the first trimester of pregnancy, but the chorionic biopsy procedure itself carries a risk of miscarriage of 1-2%.

3 0
3 years ago
A polymer is...
Sophie [7]

Answer:

a polymer is a large unit comprised of monomer

6 0
4 years ago
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