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3 years ago

Explain why some substances are able to pass through the cell membrane

2 answers:

6 0

The most important property of the cell membrane is its selective permeability: some substances can pass through it freely, but others cannot. Small and nonpolar (hydrophobic) molecules can freely pass through the membrane, but charged ions and large molecules such as proteins and sugars are barred passage.

slega [8]3 years ago

4 0

Selective permanently, is the reason why the cell membrane only let's certain things pass through. small noon polar molecules (oxygen & carbon dioxide) pass through by simply diffusing. But other molecules use other types of passive transport or active transport.

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you are testing a new blood glucose monitor. every sample that you take gets a reading of 80. which of the following terms best

Sergio039 [100]

Answer:

the monitor is reliable but there is not enough info. to comment on validity

Explanation:

The monitor is consistent - which is reliability, but you can't be sure the results it is returning are correct based on the question, so validity can't be determined.

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2 years ago

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3 years ago

Which of the following represents organisms in a food chain?

Lisa [10]

Answer: c seeds, mice, snakes

Explanation:

a hawks, owls, eagles NO

These animals all eat some form of meat, and they are on the top of all of their food chains. If you put these animals in a room with no food, there'd be no food chain, and they would got out at each other until there was one left, and there'd be no advatanges because 1. they can all fly and 2. they are all top consumers. The same thing goes for D except hyenas can't fly.

b deer, rabbits, cows NO

This is not a food chain because all of the animals are herbivore, so they only eats plants and will not eat each other.

c seeds, mice, snakes YES

The seeds are a producer which is to be eaten by a consumer (the mouse), and which are then eaten by the predator, the snake.

d hyenas, vultures, crows NO

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great Valentines Day! :-)

- Cutiepatutie ☺❀❤

7 0

3 years ago

The Big Bird lineage became reproductively isolated from G. fortis. Describe one prezygotic mechanism that likely contributed to

tigry1 [53]

Answer:

Beak shape/size or song or behavior or mechanical/chemical differences or time of mating or location on the island or primary food source differs between the Big Bird lineage and G. fortis.

Also acceptable: Description of another mechanism that prevents males and females from different populations from encountering each other/recognizing each other as potential mates.

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2 years ago

During the last Ice Age, deer mice in Michigan became separated by a large glacial lake and are now two different species.

stellarik [79]

Answer:

A. Populations were separated through geographical isolation.

Explanation:

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2 years ago