What happens on the outer surface of a cell?

1 answer:

5 0

The outer surface of a cell is surrounded by the plasma membrane, which marks the boundary between the cellular content and the external medium. The plasma membrane is a continuous film made up of molecules of lipids, proteins, and carbohydrates. Lipids form a double layer and proteins are arranged in an irregular and asymmetric way between them. These components have mobility, which gives the membrane a high degree of fluidity. It acts as a semipermeable and selective barrier regulating the chemical composition of the cell.

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Please help me answer this its for a module 7 biology review

GREYUIT [131]

1. the theory that Earth's outer shell is divided into several plates that glide over the mantle
2. I am not sure
3. Earth's mantle contained convection cells that dissipated radioactive heat and moved the crust at the surface
4. supercontinent that existed during the late Paleozoic and early Mesozoic eras.
5. the theory that the outer rigid layer of the earth (the lithosphere) is divided into a couple of dozen "plates" that move around across the earth's surface relative to each other, like slabs of ice on a lake.
6. Africa and South America.
7. I am not sure
8. a small area or region with a relatively hot temperature in comparison to its surroundings.
9. As the plate moves over a fixed spot deeper in the Earth where magma (molten lava) forms, a new volcano can punch through this plate and create an island. The Hawaiian Islands are believed to be formed from one such 'hot spot'.

8 0

3 years ago

Which of the following is a covalent compound?

V125BC [204]

Answer:

Water is a covalent compound.

Explanation:

covalent compounds are individual molecules characterized by the sharing of electrons between two or more atoms. Two atoms with similar electronegativity will not exchange an electron from their outermost shell; the atoms instead share electrons so that their valence electron shell is filled.

Example:

Examples of compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), Water (H2O) and iodine monobromide (IBr).

Properties:

1. At room temperature and normal atmospheric pressure, covalent compounds may exist as a solid, a liquid, or a gas.

2. Covalent compounds do not exhibit any electrical conductivity, either in pure form or when dissolved in water.

3. Covalent compounds have lower melting and boiling points.

5 0

3 years ago

Read 2 more answers

One option for reducing air pollution is to

KonstantinChe [14]

One option for reducing air pollution is to cut back on major producer factories.

3 0

3 years ago

Explain why it is important to consider the role of humans when we learn about environmental science.

DIA [1.3K]

Answer: When you study environmental science, you commit to learning of accomplish important tasks for our Earth and our human population.

Explanation: Hope this helps! :)

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4 years ago

Alyssa observed a flock of small birds in her yard. The birds visited a pair of feeders that her parents put out for them and sp

olasank [31]

Do they like the food

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3 years ago