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3 years ago

What are two ways in which a particle that is too large to fit through the cell membrane can enter the cell?

Biology

1 answer:

mezya [45]3 years ago

3 0

Facilitated diffusion and active transport

Facilitated diffusion is the movement of large particles (that cannot otherwise move across the cell membrane) from an area of higher concentration to an area of lower concentration with the help of trans-membrane proteins.

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration using ATP energy. this may occur with large particles that cannot move across the cell membrane or small ones that can but don't due to the concentration gradient.

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List and describe the most important erosional and depositional features of a river and how these features form.

Mkey [24]

Answer:

Meanders

As the river makes its way to the middle course, it gains more water and therefore more energy, so material can be carried in suspension and is used to erode the river banks. Lateral erosion starts to widen the river. When a river flows over flatter land it develops large bends called meanders.

As a river goes around a bend, most of the water is pushed towards the outside. This causes increased speed due to less friction and therefore increased erosion (through hydraulic action and abrasion).

The lateral erosion on the outside bend causes undercutting of the river bank to form a river cliff.

There is less water on the inside bend of a meander so friction causes the water to slow down, lose energy and deposit the material the river is carrying, creating a gentle slope.

The build-up of deposited sediment is known as a slip-off slope (or sometimes river beach).

The fast current on the outside bank causes lateral erosion, creating a river cliff. The slow current on the inside bank causes deposition, creaitng a slip-off slope.

Oxbow lakes

Due to erosion on the outside of a bend and deposition on the inside, the shape of a meander will change over a period of time. Erosion narrows the neck of the land within the meander and as the process continues, the meanders move closer together. When there is a very high discharge (usually during a flood), the river cuts across the neck, taking a new, straighter and shorter route. Deposition will occur to cut off the original meander, leaving a horseshoe-shaped oxbow lake.

Erosion makes the neck narrow. During floods, the river takes the shortest course through the neck. The river has a new straighter course and the abandoned meander is called an oxbow lake.

Explanation:

3 0

3 years ago

If you ate a burger, you would probably only get about of the original energy from the sun

olga_2 [115]

False? You would not get the same amount of energy

3 0

3 years ago

Which plant structure is the dominant sporophyte of angiosperms?

Elenna [48]

Flowers are the plant structure that is the dominant sporophyte of angiosperms.

5 0

3 years ago

Read 2 more answers

The element ________ is used in nuclear fission to produce energy.

dimaraw [331]

Uranium is the answer

3 0

3 years ago

Read 2 more answers

Question 1 6 pts

balu736 [363]

uestion 1 6 pts

In a lab report, the hypothesis should be in the "method" section.

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False

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Question 2 6 pts

In a lab report, the background information / research should only be one sentence.

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False

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Question 3 6 pts

In a lab report, the "materials" section is a bulleted list of the materials used.

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False

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Question 4 6 pts

In a lab report, the "statement of purpose" is in the "introduction" section.

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False

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Question 5 6 pts

In a lab report, a discussion of the results should be in the "results" section.

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False

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Question 6 6 pts

In a lab report, any errors made should be mentioned in the "discussion" section.

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False

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Question 7 6 pts

In a lab report, a numbered, step-by-step set of instructions for performing the experiment should be in the "discussion" section.

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False

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Question 8 6 pts

In diffusion, solute moves from an area of high concentration to an area of low concentration.

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False

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Question 9 6 pts

In osmosis, the solvent moves.

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False

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Question 10 6 pts

One of the products produced in photosynthesis is glucose.

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Question 11 6 pts

The order of mitosis is: interphase, prophase, anaphase, telophase, metaphase.

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Question 12 7 pts

Human cells have 17 chromosomes.

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Question 13 7 pts

Meiosis is involved in the production of gametes.

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Question 14 7 pts

Plant cells have a cell wall.

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Question 15 7 pts

ATP is produced in the mitochondria.

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Question 16 6 pts

In the process of cellular respiration, ATP is produced

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False

8 0

3 years ago