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Daniel [21]
3 years ago
14

What is cell membrane

Biology
2 answers:
sdas [7]3 years ago
8 0

Answer: Cell membrane is layer which is present in all living cells. It is present under the cell wall but in some cases such as plant cells.

Explanation: It is composed of lipid bilayer and proteins embedded in it. Phospholipids, glycolipids and sterols is the composition. Its function is to protect the cell from extracellular environment. It is semipermeable membrane that js allow only selected molecules to pass.

liubo4ka [24]3 years ago
4 0

Answer: A cell membrane is a phospholipid bilayer that defines the external boundaries of cells and regulate the molecular traffic across the boundary.

Explanation: Cell membranes are flexible, self-sealing and selectively permeable bilayer of phospholipids with proteins embedded in the bilayer through hydrophobic interactions. Cell membranes are formed by the interactions of the hydrophobic tails of the phospholipids, the hydrophobic tails of the phospholipids face each other while their polar head groups face outward, thus forming a bilayer with a fluid hydrophobic core. The selective permeability of membranes makes them to retain certain compounds and ions within cells while excluding others. Cell membranes include an array of proteins specialized for promoting or catalyzing various cellular processes such as synthesis of lipids and certain proteins and the energy transductions in mitochondria and chloroplasts.

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A regular progression of species replacement is called __________.
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Answer:

this should help you figure this out!

Explanation:

a somewhat regular progression of species replacement is called succession consists of a community and all the physical aspects of its habitat such as the soil water and weather. Ecosystem.

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3 years ago
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When two lineages split from a common ancestor, each accumulates different mutations over long periods of time. The number of mu
Len [333]

Answer:

# of mutations in the exons

Explanation:

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2 years ago
In plants, chloroplasts are necessary for A. respiration. B. photosynthesis. C. secretion. D. both respiration AND secretion. E.
Ksivusya [100]

Answer:

B- Photosynthesis

Explanation:

Chloroplasts are <em>chlorophyll-containing, eukaryotic cell structures</em> that function in photosynthesis by absorbing energy from sunlight, combining this energy with water and CO2 to convert them to sugars . This cell structure is known as a plastid. The sugars produced, are important for the survival of the plant.

Chloroplasts reproduce on their own, independent of the whole cell because they contain their own DNA. Plant chloroplasts are located  in guard cells in plant leaves. Closely linked to these guard cells are tiny pores called stomata, which allow gas exchange required for photosynthesis.

Photosynthesis occurs in two stages:

  1. The light reaction stage
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The Light reaction stage takes place in the presence of light. Clorophyll converts light into chemical energy in the form of ATP and NADPH. Both molecules produced, are used in the dark stage to produce sugar.

In the dark reaction stage, the stroma, containing enzymes, facilitates reactions leading to the production of sugars from ATP and NADPH. This process is also called the carbon fixation stage. The sugar produced can be stored in the form of starch for other processes such as respiration.

8 0
3 years ago
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If a th reads this, or if destinyawakens goes on this question can u help me, if its anyone else besides him. dont answer this.
Anon25 [30]
<span>The Cerebrum: The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. The cerebral cortex is divided into four sections, called "lobes": the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.</span>
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1. An organism's body is constructed using the information contained in memory b. proteins. Ribosomes. d. Deoxyribonucleic acid.
soldi70 [24.7K]

Answer:

Deoxyribonucleic

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The carry traits from offspring parent.

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