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3 years ago

12

A star has a mass fifty times greater than Earth's sun, very high teperature, and is very bright. What will most likely happen t

o the sat as it ages? It will become a _____.
A. supernova

B. white dwarf

C. blue star

D. red dwarf

2 answers:

Zielflug [23.3K]3 years ago

8 0

A. supernova I think is the answr

DIA [1.3K]3 years ago

6 0

I think it would be a

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Sort the phrases into the appropriate bins depending on whether they are true only for channels, true only for carrier proteins,

ehidna [41]

<h2>The correct answer is explained below:</h2>

Explanation:

The Plasma membrane of a cell is made up of a phospholipid bilayer which has a hydrophobic core and hence is impermeable to water soluble or polar organic and inorganic molecules.
However, a cell can maintain proper homeostsis and undergo metabolism only when it is able to exchange different hydrophilic and polar organic and inorganic chemical components present inside the cell with those present outside the cell.
This necessitates the development of a "path" that could connect the cell interior to the cell exterior.
The path is developed by integral membrane protein that spans across the lipid bilayer opening on either side of the membrane, thereby connecting the cell interior with the cell exterior.
These integral membrane proteins are amphipathic in nature, that is, they are composed of both polar and non-polar amino acid residues. The amino acid residues are arranged such that the non polar amino acid residues face and undergo hydrophobic interactions with the water avoiding lipid molecules in the plasma membrane. The polar amino acid residues face towards the lumen of the opening in between the cell interior and exterior such that they can form hydrogen bonding with the water soluble polar organic or inorganic molecules and help them traverse the plasma membrane.
These integral membrane proteins are of two types: Channel proteins and Carrier proteins.
The Channel proteins:

Form a direct and continuous opening across the plasma membrane. They can either remain always open or can be gated, that is, they open only on associating with specific signalling molecules.
They transport solutes from a region of high electrical charge or concentration to a region of low electrical charge or concentration, that is, down the electrochemical or concentration gradient.
They usually allow the easy and quick transport of water molecules and small ions across the membrane.

The Carrier proteins:

They undergo a change in their conformation to translocate solute molecules across the plasma membrane and they do not form a continuous opening.
When they open on one side of the membrane they are closed on the other side. They cannot remain, simultaneously, open on both sides of the membrane.
They are required mainly for the translocation of small polar organic molecules across the plasma membrane down the electrochemical or concentration gradient.

For channels only:

g.
a.

For carrier proteins only:

f.
b.

For channels as well as carrier proteins both:

c.
e.
d.

4 0

3 years ago

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VMariaS [17]

Answer is A.

Cell have to spilt themselfs apart to make more cells for the system. Tree are like cells because they sometimes have seeds in them that help generations of trees grow!

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3 years ago

A man and woman are each heterozygous for the autosomal recessive gene for pink hair. They already have two non-pink hair childr

liubo4ka [24]

Answer:

25%

Explanation:

use a punnet square, it shows that the dominant trait will give the offspring 75% chance of having the non pink hair phenotype

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3 years ago

om a foreign country enters New York's Central Park. As a result, one of the tree species becomes ravaged by the beetle. The bee

Anvisha [2.4K]

An invasive species because it isn't naturally from central park.

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3 years ago

What are DRIs and why are they preferred? Why are they not on food labels?

Pie

DRIs is the general term for a set of reference values or guidelines that are used to plan and asses nutrient intakes of healthy people. These values which vary by age and gender include:

- Recommended Dietary allowance (RDA): average daily level of intake sufficient to meet nutrient requirements of about 97 - 98% of healthy people.

-Adequate intake (AI): established when evidence is not sufficient to develop an RDA and is set at a level assumed to ensure nutritional adequacy.

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DRIs are not necessarily found on labels because there is no law requiring that they must be placed there.

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