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11Alexandr11 [23.1K]
3 years ago
11

12.

English
1 answer:
katen-ka-za [31]3 years ago
3 0

Answer:

The correct answer is: past perfect progressive.

Explanation:

He <u>had</u> also <u>been hoping to link</u> his files to those of other scientists and engineers.

The underlined tense is past perfect progressive. We use this verbal tense to describe an action that started in the past and continued to another moment in the past. This means that the duration of action continues but it stops before some other action in the past. We form this tense with <em>had been</em> + present participle of the main verb.

The sentence above shows us both the cause and effect of an action in the past. At some point in the past, the speaker was hoping to his files to the files of other scientists and engineers, which already have existed.

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Use the word hydroelectric in a meaningful sentence​
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Answer:

hydroelectric turbines were installed in place of the water wheel.

Explanation:

I hope this helps, if not I'm sorry, have a good day

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Write an email of six sentences to your friend about your favorite school subject
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Dear (friend),

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Are you aware of a situation today that requires hope? .If yes, what do you plan to do about it to bring a change?
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With the fall of the Roman Empire, the Catholic Church took a negative stance on popular theatrical performances. Which of these
Yuri [45]
<span>Performances supposedly drew bad crowds and sent immoral messages.</span>
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Read 2 more answers
What can you say about the side chain of valine?
labwork [276]

Answer: Valine is an essentail Amno Acid

Explanation:

INTRODUCTION:

Valine is an essentail Amino acids. Essential Amino acid are organic compounds composed of nitrogen, carbon, hydrogen and oxygen, along with a variable side chain group.

Our body needs 20 different amino acids to grow and function properly. Though all 20 of these are important for your health, only nine amino acids are classified as essentail.The best sources of essential amino acids are animal proteins like meat, eggs and poultry.

When you eat protein, it’s broken down into amino acids, which are then used to help your body with various processes such as building muscle and regulating immune function.

Valine is one of three branched-chain amino acids, meaning it has a chain branching off to one side of its molecular structure. Valine helps stimulate muscle growth and regeneration and is involved in energy production. Though amino acids are most recognized for their role in muscle development and repair, the body depends on them for so much more. The reason why essential amino acid (Valin) deficiencies can negatively impact your entire body including your nervous, reproductive, immune and digestive systems.

Acid - Base Properties of Amino Acids( Valine)

Acidic Side Chains:

this side chain contains an acid functional group, the whole amino acid produces an acidic solution. Normally, an amino acid produces a nearly neutral solution since the acid group and the basic amine group on the root amino acid neutralize each other in the zwitterion. If the amino acid structure contains two acid groups and one amine group, there is a net acid producing effect.

Basic Side Chains:

If the side chain contains an amine functional group, the amino acid produces a basic solution because the extra amine group is not neutralized by the acid group.

Amino acids with an amide on the side chain do not produce basic solutions

Neutral Side Chains:

Since an amino acid has both an amine and acid group which have been neutralized in the zwitterion, the amino acid is neutral unless there is an extra acid or base on the side chain. If neither is present then then the whole amino acid is neutral.

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