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Grace [21]
2 years ago
8

Please describe the process of natural selection in your own words by using an example.

Biology
1 answer:
irina1246 [14]2 years ago
3 0

Answer:

natural selection is animals slowly adapting to its environment

an example is giraffes, giraffes with longer necks will be able to consume more food than giraffes with shorter necks as they they can reach for the leaves on trees. over time the giraffes with shorter necks become extinct and giraffes with longer necks still remain.

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During which phase of mitosis do the chromosomes become distinctly visible in the microscope?
mylen [45]

Prophase of mitosis do the chromosomes become distinctly visible in the microscope.

During metaphase, the nucleus dissolves and the cell's chromosomes condense and move together, aligning in the center of the dividing cell. At this stage, the chromosomes are distinguishable when viewed through a microscope. The first stage of mitosis and of meiosis I and II.

During prophase the chromosomes become visible as distinct structures, the nuclear envelope breaks down, and a spindle forms (Meiotic prophase I is more complex, and includes synapsis of homologous chromosomes and crossing over). During Prophase chromosomes become Clearly visible, nuclear envelope disappears, kinetochores and spindle fibers form.

To learn more about prophase , here

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6 0
2 years ago
Study the cladogram. Which two organisms would be the least related?
Svet_ta [14]
C. lizard and chimpanzee

8 0
2 years ago
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Which of the following distinguishes the 38 organisms in the kingdom Fungi from other Eukaryotic organisms A- Fungi reproduce us
Amanda [17]
<span>Fungi obtain nutrients by absorption</span>
4 0
3 years ago
Any change or random error in a DNA sequence
Sever21 [200]
Any change or random error in a DNA sequence is called a mutation.
7 0
3 years ago
Storage polysaccharides, like starch and glycogen, often contain over a million glucose units. The energetic cost of synthesizin
Ivahew [28]

Answer:

Glucose present as monomers within the cell will exert more osmotic pressure than a single glycogen molecule, resulting in endosmosis and the lysing of cells.

Also, the presence of free glucose molecules will result in increase in weight of the liver due to lack of efficient packing as in glycogen as well as the association ofnthe glucose molecules with water molecules.

Explanation:

Glycogen is a polysaccharide composed of glucose monomer units linked to Each other by α-1,4-glycosidic binds. α-1,6-branches arises at about every 10th glucose residue in the straight chain. Thus animals more glucose molecules to be stored within a much smaller space, thereby incresing the bulkiness of glycogen. Glycogen molecules are insoluble in the aqueous medium of the cell because it doesn't have enough free polar groups to participate in hydrogen bonding with water and are stored as granules and therefore do not affect the water potential or osmotic balance of the cell.

On the other hand, glucose molecules are highly soluble in water because it has many free polar -OH grours that form hydrogen bonds with water. If the glucosyl residues in large numbers of glycogen molecules were replaced with an equivalent number of molecules of free glucose, the free glucose will exert a high osmotic pressure inside the cell, causing the entry of water in the cell by endosmosis resulting in swelling and lysis ofnthe cell. Also, the space occupied by these free glucose units within the cell will be much larger than that of glycogen whichmenables efficient packing ofthe glucose molecules.

5 0
2 years ago
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