Which of the following solutions is the weakest acid? O a solution with a pH of

Question

Which of the following solutions is the weakest acid? O a solution with a pH of 24 O a solution with a pH of 8.6 O a solution with a pH of 6.4 O a solution with a pH of 5.2 Question 18 1 pt Which of the following is NOT true about proteins? Proteins account for about 10 percent of the organic matter in the body The building blocks of proteins are amino acids Fibrous proteins are also called structural proteins and appear most often in body structures. lobular proteins that play crucial roles in virtually all biological processes are also called functional proteins. Amino acid chains containing fewer than S0 amino acids are called polypeptides

Explanation / Answer

Question 17

Which of the following solutions is the weakest acid?

Answer: a solution with pH of 6.4

Explanation: The pH scale measures the acidity and basicity of the substance. It ranges from 0 to 14. Substances with pH ranging from 0-6 are considered as acids and the substances with pH ranging from 8-14 as bases. A substance with pH of 7 is considered as neutral. The substances that have pH closer to 7 are considered as strong and the substances with pH away from 7 are considered as weak. A substance with pH of 1 or 2 is a strong acid and with pH 5 or 6 a weak acid. Similarly, a substance with pH 13 or 14 would be a strong base, while a substance with pH 8 or 9 a weak base. Example: Strong acid Vinegar (pH 2.4), weak acid-citric acid (pH 4.8).

Question 18

Which of the following is NOT true about proteins?

Answer: Proteins account for about 10 percent of the organic matter in the body.

Proteins account for 50 percent of the organic material in the body, which is equal to the 17 percent of the body weight. All most all the physiological processes are driven by proteins.

All proteins are made of amino acids. Amino acids join together to form peptides, which in turn join to form polypeptides.

Fibrous proteins are strand like and appear most often in body structures. They bind the body structures together and provide strength to the body tissues. Example, collagen (in bones, cartilage and tendons), keratin (in hair and nails).

Globular proteins are mobile, spherical molecules and play a crucial role in virtually all the biological processes. They are also known as functional proteins. These include antibodies, enzymes and other proteins.

A polypeptide is also known as an amino acid polymer. These polymers are chains of monomers, subunits, linked together by a chemical bond. The polypeptide is a chain of 10 or more amino acids. A single polypeptide chain can be also called as a simple protein.

Explanation:

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