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4 years ago

Why does the charge on a protein vary with change in PH

1 answer:

6 0

As the pH of a solution increases, deprotonation of the acidic and basic groups on proteins occur,
so that carboxyl groups are converted to carboxylate anions (R-COOH to R-COO-) and ammonium groups are converted to amino groups (R-NH3+ to R-NH2).
In proteins the iso-electric point (pI) is defined as the pH at which a protein has no net charge.
When the pH > pI, a protein has a net negative charge and when the pH < pI, a protein has a net positive charge.
The pI varies for different proteins.

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Provide the correct answers for the problem shown below.

Aleks04 [339]

Answer:

1---a

2--d

3---b

4---c

Explanation:

hope this helps

8 0

3 years ago

Read 2 more answers

What do you think of when you hear the word science? How would you define it?

Scorpion4ik [409]

I usually think of biology first, and then physics. I trust those types of science a whole lot more than social sciences. I don't think of it like most non-sciency people do (like with diet pills and perfume). I think of it like using the actual scientific method, doing the same thing over and again expecting different results, taking the objective (or subjective, when that applies) results and forming a logical conclusion and not one that fits your hypothesis/agenda. Kind of like those kids that every high school has (on TV shows, they're the ones that are doing something with robotics all the time) that are nerdy, science geeks always running experiments and seeing what happens.

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3 years ago

The breakup of Pangaea occurred during the _____.

stepan [7]

<h3>Answer;</h3>

A. The Triassic period of the Mesozoic Era

<h3>Explanation;</h3>

Pangaea was a super continent that existed about 300 million years ago, instead of the current seven continents.
During the Triassic period, the first period of the Mesozoic Era the Earth's landmasses had coalesced to form the super continent Pangaea. By the end of this period the super continent began to divide into two; Laurasia in the north and Gondwana in the south, under the influence of plate tectonics.

During the Jurassic Period which was the second segment of the Mesozoic Era that followed the Triassic period, the super-continent Pangaea further split apart.

7 0

3 years ago

Read 2 more answers

Which of the following is TRUE of a cell membranes?

adoni [48]

Answer:

B, C, Dand E are all correct

Explanation:

Why B is correct- The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environment. It is selectively permeable, which means that it only lets certain molecules enter and exit.

Plants, animals, and bacteria have a cell membrane. Why d is correcect

Why C is correct- The cell membrane is not a solid structure. It is made of millions of smaller molecules that create a flexible and porous container. Proteins and phospholipids make up most of the membrane structure.

Why E is correct- The plasma membrane is primarily composed of phospholipids arranged in a bilayer, with the hydrophobic tails on the interior of the membrane, and the hydrophilic heads pointing outwards

Why A Is Not correct- It is very fragile and its role is to hold the cell together and to help control what substances can get in and out. It is partially permeable, allowing only some substances to pass through it. The membrane has a complex structure consisting of a phospholipid bi-layer and different types of proteins.

4 0

3 years ago

Carbon-14 is useful for dating fossils that are ______.

MrRissso [65]

Carbon-14 is useful to estimate the date of fossils that are less than 50,000 years old.

Option C

Explanation:

Carbon-14 is the best option to use by estimating the date of fossils that are below 50,000 years old. This is because the carbon-14' half-life is around 5730 years i.e. the existing Carbon-14 in the living bodies decays in 5730 years once they die.

That's the reason Carbon dating utilized to estimate the age of objects that are below 50,000 years old. Objects such as dead plants, wood or human artifacts that are younger than 50,000 years.

After the death of living beings, Carbon 12 and Carbon 14 existing in these organisms starts decaying by converting into Nitrogen. By estimating the leftover amount of carbon 14 in their bodies, scientists can evaluate their age.

6 0

4 years ago