List 3 examples of a selectively permeable material or item. Explain where it is found or used and why a selectively permeable item is needed

Answers

Answer 1

Answer: Answer;
Examples of selectively permeable materials or items are;
1. Vacuum filter- it traps dust but allows air through
2. Coffee filter- allows water to pass through, but does not allow the coffee grounds.
3. Colander -used to strain liquid food from foods. it drains water but is not permeable to larger food particles.

Explanation;
Selective permeability means that a material or a substance allows the passage of some molecules or ions and other materials to pass through it, and inhibits the passage of others.
For example a cell membrane is semi-permeable and thus regulates the transport of materials such that some particles pass through while others can not cross. A semi-permeable membrane allows selective movement of materials, it acts like a filter that allows particles to pass or not according to their size, solubility, electrical charge, or other chemical and physical properties.

Answer 2

Answer: I have this question for homework as well.
Colander - drains water but isn't permeable enough to lager food (used to strain liquid from food)
Vacuum filter - traps dust but allows air through (used to clean)
Coffee filter - allows air through (used to make coffee)

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if research is restricted.then the new discoveries made are limited. which action is most likely to increase the number of discoveries scientist can make?

Answers

Answer:

removal of certain laws

Explanation:

depending on the country certain actions are illegal. Like gene editing can solve many genetic problems but laws make it illegal to test on human subjects

Protein that detects a signal molecule and performs an action in response is called a

Answers

Answer: Receptor

Explanation: a protein that detects a signal molecule and performs an action in response.

Final answer:

A receptor protein is a type of protein that detects a signal molecule (ligand) and performs an action in response. It can induce a chemical reaction within the cell or initiate a signaling pathway which can change the cell's behaviour.

Explanation:

A protein that detects a signal molecule and performs an action in response is called a receptor protein. Receptor proteins in or on a target cell bind to specific molecules outside the cell called ligands. When a ligand binds to its specific receptor, it induces a chemical reaction within the cell. This binding could open a channel for certain ions to flow into the cell or initiate a signaling cascade or pathway with the help of second messengers, enzymes, and other proteins. The signaling cascade eventually leads to a change in the cell's environment or behavior. For example, neurotransmitters such as dopamine can act as ligands, binding to dopamine receptor proteins on nerve cells and causing specific responses in these cells.

Learn more about Receptor Proteins here:

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How do you use a Punnett square to develop a proportion to predict the variability of offspring in a certain cross?

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A Punnett square can used to predict the variability of offspring in a certain cross by combining the combining the genotypes of the parents:
The genotype of the parents are written on the top row and on the first column. As an example, for hair texture trait, curly hair is dominant and straight hair is recessive.
One parent has the genotype CC (pure curly haired) while the other parent has the genotype Cc (hybrid curly haired). The Punnett square is shown below. The combination of the genotypes predict the possible offspring.
________________
|____|__C__|__C __|
|_C _|__CC_|_CC__|
|_c__|__Cc_|__Cc__|

Only answer if you have an answer to one of the questions. Thank you.

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Answer:

An internal stimulus is a stimulus that comes from inside an organism. You may have experienced an internal stimulus of hunger after a long day at school, and this prompts you to eat some food in order to regain needed energy

3. It means that every aspect in this world has its own process of development and undergoes a change where they accumulate growth

does anyone have any ideas (easy) on cell simile projects. busy week but due tomorrow.HELP

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A city, a factory. Just some ideas. If you're talking about the same project I did in Biology.

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If a shadow was cast over the entire earth. We would die. How fast?
Well if the shadow was cast by something being directly in front of thesun at its surface (that's a pretty darn big "something") then it wouldprobably take about 1 hour for everyone to die. 8 minutes for us to seethe sun get blocked out and for the light to stop hitting the earth.Another 52 minutes for the entire atmosphere to cool... well freeze...then everyone would die. The temperatures would plummet fast enough tofreeze a layer of ice over all the oceans in a few hours. People couldsurvive this if they had warning, although there would be no habitableworld to come back to.

You need to understand that, without any sunlight, the earth wouldplummet to at least about -171º C. that's -279º F. What keeps us warm isthe fact that one side of the planet ALWAYS has sunlight. + we haveoceans and atmosphere to distribute heat. But if both sides of theearths atmosphere had to be subjected to those temperatures, it wouldsimply freeze the more and more of the atmosphere until it got to thelevel that you breath O2 at. The oceans would cool much too fast tosustain any heat distribution and the ice caps would grow faster andfaster and faster until the earth is frozen over.

My estimate is about 1 hour for ground level temperatures to hit a critical life threatening level

the earth will not be able to get it sun and that if the earth dont hsave it sun
it will always e night

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