The hormone adrenaline can affect only cells with

Describe the R group found within an amino acid

madreJ [45]

Hello!

An amino acid has five basic parts. An amino group, a carboxyl group, a central carbon atom, a hydrogen, and a R group.

The r group is the side chain specific to each amino acid. The r group varies between each kind of amino acid, while everything else stays the same. Therefore, the r group decides the identity of the amino acid.

Hope this helps! Let me know if you need a more specific explanation.

5 0

3 years ago

Which of the following are true statements?

Digiron [165]

Answer:

The first is true

The second is true IF the statement means that the human body contains energy

The third is true

The fourth is false

8 0

3 years ago

A student has two solutions of a substance. Solution-1: 25M, 400mL, and Solution-2: 30M, 300 ml. What is the molarity of the fin

castortr0y [4]

Answer:

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

Explanation:

Yo know:

Solution-1: 25M, 400mL
Solution-2: 30M, 300 mL

Molarity being the number of moles of solute per liter of solution, expressed by:

$Molarity (M)= \frac{number of moles}{volume}$

You can determine the number of moles that are mixed from each solution as:

Number of moles= Molarity*Volume

So, being 1 L=1000 mL, for each solution you get:

Solution-1: being 0.400 L=400 mL ⇒ 25 M* 0.400 L= 10 moles
Solution-2: being 0.300 L=300 mL ⇒ 30 M* 0.300 L= 9 moles

When mixing both solutions, it is obtained that the volume is the sum of both solutions:

Total volume= volume solution-1 + volume solution-2

and the number of total moles will be the sum of the moles of solution-1 and solution-2:

Total moles= moles of solution-1 + moles of solution-2

So the molarity of the final solution is:

$Molarity (M)= \frac{moles of solution 1 + moles of solution 2}{Volume solution 1 + Volume solution 2}$

In this case, you have:

moles of solution-1: 10 moles
moles of solution-2: 9 moles
volume solution-1: 0.400 L
volume solution-2: 0.300 L

Replacing:

$Molarity (M)=\frac{10 moles + 9 moles}{0.400 L + 0.300 L}$

Solving:

$Molarity (M)=\frac{19 moles}{0.700 L}$

Molarity= 27.14 $\frac{moles}{L}$

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

4 0

3 years ago

Water is unique because

wolverine [178]

Answer:

b. It exists in three different states at normal conditions in the Earth's atmosphere

Explanation:=

Snow, rain and water vapour can exist at normal conditions in the Earth's atmosphere.

a. is wrong. Only hydrogen and helium can escape Earth's atmosphere in significant amounts.

c. is wrong. The molecules of every substance are in motion even when it is solid.

d. is wrong. Other substances can form from a wide range of chemical processes.

e. is wrong. All substances expand when they become a gas.

7 0

3 years ago

chemist in South America claims to have discovered a new element with an atomic number of 34. An extremely rare element, it was

Tasya [4]

Answer:

the element he has discovered is called Selenium.

Explanation:

Selenium has an atomic number of 34

7 0

3 years ago