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Aleks [24]
3 years ago
14

Which of the following elements makes up the smallest percentage of the atmosphere?

Biology
2 answers:
Tanzania [10]3 years ago
5 0

Answer:

c: Carbon Dioxide

Explanation:

Earth's atmosphere is mainly made up of:

78% nitrogen

21% oxygen

0.03% carbon dioxide

And smaller percentages of other elements. Therefore, out of the options, the answer is carbon dioxide

Brrunno [24]3 years ago
3 0

Answer: A

Explanation:

Oxygen makes up another 20 to 21 percent of our atmosphere. It's essential for life on Earth, and interestingly enough, it is poisonous when highly concentrated. Our concentration of 20 to 21 percent seems just right.

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The correct answer is vitamins and proteins.

Using the supplements for dog is important in order to make the muscle growth and to strengthen the tissues.

Vitamins, such as Vitamin C, which is required for a dog to support collagen production or Vitamin E which has antioxidant function.


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A species of insect is newly introduced into the United States from the Philippines. This insect becomes established, laying its
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What molecule acts as the energy currency for the cell
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Which statements are true regarding the citrate cycle?A. Mutating histidine residue 274 of the citrate synthase enzyme to an ala
Zepler [3.9K]

Answer:

The correct answers are option A. "Mutating histidine residue 274 of the citrate synthase enzyme to an alanine amino acid would likely eliminate or reduce the enzymatic activity of citrate synthase", B. "The histidine residue would hydrogen bond to acetyl-CoA throughout the reaction mechanism, stabilizing the enolate intermediate", and D. "Oxaloacetate would be repulsed from aspartic acid in the first step of the reaction mechanism".

Explanation:

Citrate cycle is comprised of a series of reactions used in aerobic organisms to release energy from different chemical species. In this cycle, the citrate synthase enzyme catalyzes the first reaction which is the formation of citrate by the condensation of acetyl-CoA and oxaloacetate. The enzymatic activity depends on the histidine residue 274, which acts as proton donor to the carbonyl oxygen of acetyl CoA stabilizing the enolate intermediate of citrate. Therefore, a mutating histidine residue 274 of the citrate synthase enzyme to an alanine amino acid would likely eliminate or reduce the enzymatic activity of citrate synthase, also oxaloacetate would be repulsed from aspartic acid in the first step of the reaction mechanism as a result of this modification.

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