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3 years ago

How do facilitated diffusion and active transport differ? Is osmosis an example of facilitated diffusion or active transport?

1 answer:

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Note that Facilitated diffusion , Active transport and Osmosis are three different ways of transporting substances across the cell surface membrane.

Facilitated diffusion is the movement of a substance from high to low concentration , similar to simple diffusion , but due to the complexity of the cell surface membrane , polar molecules and ions cannot just pass like that , so they pass through specific carrier and channel proteins in the cell surface membrane and so we call it facilitated diffusion.

For Active transport , it's the movement from low to high concentraion using energy from ATP

For Osmosis , it's totally different . You only name osmosis when its all about water . Its the net movement of water from high water potential to low water potential through partially permeable membrane .
If you're doing AS , you'll be familiar with Endosmosis and Exosmosis.

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Neuroscientists, psychologists, and educators generally believe that teenagers need firm and consistent home and school environm

marin [14]

Answer:

Prefontral brain cortex and the brain tonsil

Explanation:

During the adolescence years, the brain continuous to grow like the rest of the body. This part of the brain is the responsible for the attention, the control of the impulses, the ability to plan for future and the consequences of the acts. This is the reason why in some occasions the teenagers have change of mood so quickly.

The brain tonsil controls the emotions, the impulses and the aggression, this also another reason why the teenagers in some occasions can overreact in situations that are no so critical.

For this behavior the specialist recommended environments in which the children can be direct in a positive education to control their impulses.

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2 years ago

Some viruses, such as the human immunodeficiency virus (HIV), are RNA viruses. Since these viruses do not contain DNA, how do th

vladimir1956 [14]

RNA viruses take control of a cellular enzyme to design a replication compartment on the cell's membrane filled with PI4P lipids. Those copies then can go on to infect other cells.

The answer would be D.

4 0

2 years ago

1 Point

____ [38]

During Prophase chromosomes condense, and mitotic spindle form, chromosomes are copied, and the nuclear membrane disappears, spindle fibres pull the sister chromatids apart.

Explanation:

Prophase is divided into 2 sub-phases as early Prophase and late prophase.

Early Prophase:

In early prophase distinct thick chromosome like structures, Centrioles move to the opposite poles and, nuclear membrane disappears

By late prophase:

Astral rays and spindle fibres are formed. Spindle fibres attach to the chromosome. Contractions occur in the attachment and sister chromatids are pull apart towards the equator.

Metaphase will follow the prophase.

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3 years ago

If a speaker begins by saying, "It is nature’s best bug control, and night-blooming flowers depend on it for pollination. As Nor

julia-pushkina [17]

Answer:

Option D, create suspense

Explanation:

In the beginning of the statement, the speaker has not mentioned the name of the natures best natural beg. He first described its extinguishing characteristics and then revealed its name “Chiroptera” and the problem “endangered species even being the best bug controller”

A quotation is the direct representation of someone else’s statement, which is not the case here. Hence option A is not correct. It is also not a story with a plot.

Option C is also incorrect as personal reference based statement describes some personal happening, event or incident.

Hence, option D is correct

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3 years ago

2. Humans, just like all other living organisms, have evolved over time. Explain how scientists

natta225 [31]

Answer:

A. fossils of archaic humans show we have evolved through the differences in bone structure. Humans used to look a lot like chimps, and through fossils we can see differences in our skull shape and size, differences in the amount of body hair we had, and through vestigial bones like wisdom teeth, which we do not need anymore today. Wisdom teeth were likely used to chew raw meat, which we do not do anymore.

C. Chimpanzees are our closest living relatives on the planet, with 99% of our DNA being the same.

Explanation:

Sorry the first one is lengthy, I don't know how long it should be but I hope that helped

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3 years ago