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Nastasia [14]
2 years ago
15

Explain two ways materials can enter the cell through passive transport. Include in your answer: the types of substance that is

transported, the concentration gradient, and any structures in the cell membrane required to be used.
Explain two ways materials can enter the cell through passive transport. Include in your answer: the types of substance that is transported, the concentration gradient, and any structures in the cell membrane required to be used.
Biology
1 answer:
blsea [12.9K]2 years ago
3 0

Answer:

<em><u>Osmosis and facilitated diffusion</u></em> are two forms of passive transport that are integral to cellular transport mechanisms.

Explanation:

Cells surrounded by a bilipid layer or plasma membrane are amphiphilic, with their polar, hydrophilic lipid heads facing outward, while their hydrophobic non-polar lipid tails facing each other inward.

Although lipid-soluble molecules travel quickly through the bilayer, traveling across its surface into the cell is often difficult for charged and large molecules. Thus, transport proteins, pores and gated channels, transmembrane channels, embedded within the membrane, help to preserve selective permeability.

Across plasma membranes as a form of passive transport in cells, substances move via:

  1. osmosis - water molecules readily pass through the membrane;  the molecules move from high concentration regions to low concentration regions at will through the membrane- they move down their concentration gradient
  2. facilitated diffusion - channel proteins allow charged ions to move across the membrane. Sodium ions are able to pass freely through specialized sodium channel pores into some cells. These channels always remain open- the ions move down their concentration gradient.

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Complete question:

This cladogram shows the evolutionary relationships among some mammals based on  homologous structures.

(You will find the cladogram in the attached files)

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A Hippopotamuses are more closely related to cows than to javelinas.

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A Hippopotamuses are more closely related to cows than to javelinas.

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A cladogram is a branched diagram of characteristics shared by the organisms of a group, that represents the most probable evolutive history of the linage. Cladograms reflect the phylogenetic relationships among groups through phylogenetic trees.

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A Hippopotamuses are more closely related to cows than to javelinas. TRUE. Hippopotamuses share a common more recent ancestor with cows than with javelinas. This means that the hyppopotamus is more related to cows than to javelinas. The arrows in the cladogram (attached file) show the positions of the common ancestor shared by Hippopotamuses and Cows, and the common ancestor shared by Hippopotamuses and Javelinas.  

B Toothed whales are more closely related to mouse deer than to hippopotamuses. FALSE. Tooth whales are more related to the hyppopotamus. Their common ancestor is more recent than the common ancestor between toothed whales and mouse deer. The arrows in the cladogram (attached file) show the positions of the common ancestors.

C Javelinas and pigs are more closely related than baleen whales and toothed whales. FALSE. They are equally related.  

D Cows and mouse deer are more closely related than javelinas and pigs.

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