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xxMikexx [17]
3 years ago
12

Discuss cell surface transport in the structure of constituents

Biology
1 answer:
nika2105 [10]3 years ago
3 0

Cell surface or membrane is made of phospholipid bilayer with embedded proteins and sugars. Cell membrane acts as a barrier between cell and its external environment but it is also responsible for the communication with other cells and transport of molecules inside and outside the cell. It is selectively permeable to ions and molecules (some of them pass through the membrane easily, while others require transport proteins or channels). There are 4 ways of molecule transport:

1. Diffusion – no energy required

2. Facilitated transport – transport proteins included

3. Active and co-transport – energy required

4. Vesicle transport (exocytosis and endocytosis)

Microvilli are extensions of cell membrane that increase its surface for diffusion.

Different types of cell junctions have a different influence on the membrane transport. For example, tight junctions are a barrier and the molecules are unable to pass through.


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How many bones are in the human body?
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Explanation:

4 0
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Read 2 more answers
What adaptation do seed plants have in addition to the seed that is not found in seedless plants?
tatiyna

Answer:

The correct answer will be option-pollen.

Explanation:

The pollen are the male gametophyte which is produced in the seed plants.

The pollen produce male gametes after entering the female gametophyte. The male gametes fuse with the egg cell and form the embryo inside ovary which matures and forms seeds.  The vascular seed plants lack these pollen but instead produces male gametes in gametangia which are replaced by the pollen in the seed plants.

Thus, option-pollen is the correct answer.

8 0
3 years ago
Which of the following structures is part of the vascular tunic
Mama L [17]
The answer is "iris".
7 0
3 years ago
Use what you know about natural selection to fill in the blanks in the hypothesis.It should answer the lab question what is the
Vinil7 [7]

Answer:

The correct answer would be -

If the type of food available changes, then the frequency of beak also changes because the beak of the bird suited to food will survive successfully.

Explanation:

According to the theory of natural selection, an organism that is able to adapt according to the change in the environment, it helps in their survival and increases their number in the system.

It is given that the type of food available is changing, so it will lead to the change in the frequency of bird beaks in that particular area. So, if they adapt to survive under the changes in the available food type, otherwise not be able to survive and die.

So,

If the type of food available changes, then the frequency of beak also changes because the beak of the bird suited to food will survive successfully.

5 0
3 years ago
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