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KatRina [158]
4 years ago
8

What does it mean for a membrane to be selectively permeable?

Biology
2 answers:
Iteru [2.4K]4 years ago
4 0

The membrane is said to be semi permeable when <u>only certain molecules are allowed to pass through them</u>.

Further Explanation:

Semi-permeable membrane is the membrane which allows only a certain molecules to pass through them. This process is a type of diffusion generally does not require any external energy influence.

The diffusion takes place only of those molecules which are permeable through the membrane. This process is generally passive but can be sometimes active. One of the examples of biological semi permeable membrane is lipid bilayer which is the covering of several cells present in the body. It consists of hydrophobic head and hydrophilic tail which is embedded in the layer.

The bilayer is the mode of communication of the cell. External influence changes the structure of protein present in the layer and helps the cell to become selectively permeable. This is how the cell communicates with the surroundings.

Learn more:

1. Learn more about science and society brainly.com/question/1721226

2. Learn more about difference between law and theory brainly.com/question/192651

3. Learn more about primary succession brainly.com/question/1386621

Answer Details:

Grade: High School

Subject: Biology

Chapter: Cells and osmosis

Keywords:

Membrane, semi permeable, diffusion, lipid bilayer, bilayer, communication of the cell, external energy, active transport, passive transport.

maw [93]4 years ago
3 0

Answer;

Semi-permeability means that only certain molecules are allowed to pass through.

Explanation;

-Semi-permeability is one of the features of a cell membrane, which means that the membrane allows selective movement of materials in and out of the cell; that is only certain molecules can enter or leave the cell.

-For example smaller molecules such water and ions such as potassium and sodium ions are able to leave and enter the cell, while other molecules that are large such as protein molecules can not enter or leave the cell.

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A

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3 years ago
Write an Alternative Title for the Lesson 'This is Jody's Fawn'.
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"This is jody's brown deer"

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8 0
3 years ago
Describe the characteristics and classification of seedless vascular and nonvascular plants
Lady bird [3.3K]

Answer:

Vascular plants, also known as tracheophytes, are plants found on land that have lignified tissues for conducting water and minerals throughout the body of the plant.

1. These lignified tissues are also called vascular tissue and consist of water-conducting xylem tissue and food-conducting phloem tissue.

2. Vascular tissue forms a central column, also called stele, through the plant axis for the transport of different substances.

3. Vascular plants are said to have a true stem, leaves, and roots due to the presence of vascular tissues.

4. The root is a true root that enables the plant to anchor onto the soil and gets nutrients from it.

5. The leaves are broad and have stomata that work for gas exchange and support transpiration.

6. The stem of vascular plants is multilayered with vascular tissue that helps in the protection and conduction of food and water.

7. The arrangement of these issues might be different in a different group of plants as it depends on the pattern of division of cells.

8. The xylem is composed of non-living matter, tracheids, and vesicles, hardened by lignin that provides a stiff structure to the tissue. 9. The phloem, on the other hand, contains living sieve elements that are not lignified.

10. Vascular plants are capable of surviving on land due to their ability to transport food, water, and mineral to different parts of the plant by creating pressure through the tissues.

11. Besides, they also have several modifications that facilitate their survival on land.

12. Another essential characteristic of vascular plants is that the principal generation phase in these plants is the sporophytic phase where they produce diploid spores.

13. Vascular plants are tall and large in size compared to the non-vascular plants because of their ability to transport necessary substances to all parts of the body via vascular tissue.

14. It is believed that vascular plants are a more evolved version of non-vascular plants and thus came later in the evolutionary history.

15. Vascular plants are divided into two groups; non-seed plants or lower vascular plants or cryptograms and seed plants or higher vascular plants or phanerogams.

16. The lower vascular plants include plants like ferns that although are adapted to survive on land still have some characteristics of their aquatic ancestry. These plants belong to the group Pteridophyta.

17. The higher vascular plants are numerous and extremely diverse and are further divided into different subgroups.

18.Some examples of vascular plants include maize, mustard, rose, cycad, ferns, clubmosses, grasses, etc.

6 0
3 years ago
Which best explains the importance of a selectively permeable cell
IrinaVladis [17]
C It controls what is allowed to enter or leave the cell.
4 0
3 years ago
Where does lipids come from​
Oxana [17]

Answer:

Explanation:

Lipids also come from foods, most commonly in the form of cholesterol or triglycerides. Certain kinds of essential lipids are often present in vegetable oils and legumes, as well as the cell membranes of just about every living thing.

4 0
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