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marissa [1.9K]
4 years ago
13

What is the current model of molecular architecture of membranes?

Biology
1 answer:
Olin [163]4 years ago
8 0

The current model of plasma membrane structure is fluid-mosaic model. According to fluid-mosaic model, there is a lipid bilayer that gives fluidity to the membrane and in which the protein molecules are embedded.  The membrane is mosaic because there is a pattern of different types of molecules that are put together. Molecules are constantly moving in two dimensions.

Components of the cell membrane include:

• Phospholipids – Form a bilayer  

• Cholesterol –improves stability and reduce fluidity

• Proteins –integral (transmembrane) or peripheral  

• Sugars-usually attached to proteins.

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A sunflower is an angiosperm, and a gingko is a gymnosperm. Which best describes the life cycles of sunflowers and gingkoes? I.
dalvyx [7]

The correct statements are I, III and IV.

An angiosperm refers to a plant, which exhibits flowers and generates seeds enveloped within a carpel. The angiosperms include a large group of herbaceous plants, grasses, shrubs, and the majority of trees. While gymnosperms refer to the plants that exhibit seeds but not safeguarded by any kind of fruit or ovary. It includes the cycads, gingko, and conifers.

Both the angiosperm (sunflower) and gymnosperm (gingko) are seed-bearing plants. However, the seeds of a sunflower are safeguarded by a flower or fruit, while for the gingko, there is no mechanism like that, i.e, there is not any kind of protection. Additionally, sunflower exhibit phenomenon of double fertilization, which is not witnessed in the case of gingko.


7 0
4 years ago
Which organs perform both mechanical digestion and chemical digestion of food?
kotykmax [81]

Answer: Mouth.

Explanation:  

The mouth is known to be performing both the tasks of chemical digestion and mechanical digestion.

The food is ingested through mouth and the teeth perform the process of mechanical digestion by breaking down the food particles into smaller particles.

Then the saliva gets mixed into the food and the enzymes(amylase) present in the saliva helps in the digestion of carbohydrates.

So, mouth is the organ that performs the process of both mechanical and chemical digestion.

6 0
4 years ago
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What process recharges our groundwater.
Alja [10]
Groundwater is recharged naturally by rain and snow melt , hope this helps :)
5 0
2 years ago
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VladimirAG [237]
Eukaryotic cells have a membrane-bound nucleus, whereas prokaryotic cells do not. In eukaryotes, the nucleus is just one of numerous membrane-bound organelles. Prokaryotes, on the other hand, lack organelles that are attached to the membrane.
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3 years ago
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Which of these best describes what occurs during cytokinesis?
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Cytokinesis occurs after mitosis is complete. It is when two daughter cells are formed, each with their own nuclei, after a single cell has <em>completely </em>divided.
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3 years ago
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