Question 1

Which of the following statements is true?

Accepted Answer

Hemoglobin is indeed the protein in red blood cells that transports oxygen. A) is false because not all hormones are proteins (some are steroids or other types of molecules). B) is false because carbohydrates are actually the primary source of energy for the human body. D) is false because mucin is not involved in blood clotting, but rather is a component of mucus.

Question 2

Which of the following statements is true?

Accepted Answer

Proteins in the blood act as buffers to help maintain proper pH balance in the body. This is important for normal body function. A is false because carbohydrates and lipids are the primary energy source. C is false because excess dietary protein is usually used for energy or stored as fat; antibodies are made in response to specific infections. D is false because fibrin is a blood clotting protein and insulin is a hormone that regulates blood sugar levels.

Question 3

_____ is an essential amino acid.

Accepted Answer

Threonine is the essential amino acid among the given options as the body cannot produce it and it must be obtained through the diet.

Question 4

Which of the following amino acids is a dietary essential?

Accepted Answer

Essential amino acids are those that cannot be synthesized by the body and must be obtained from the diet. Phenylalanine is one of the nine essential amino acids. Alanine, aspartic acid, and serine are nonessential amino acids, meaning they can be synthesized by the body.

Question 5

The chemical attraction between two amino acids forms a(an)

Accepted Answer

Peptide bond is the chemical attraction between two amino acids, which forms the backbone of proteins. Fatty acid chains, emulsified polypeptides, and partially-hydrogenated proteins are not formed by the chemical attraction between two amino acids.

Question 6

Instructions for making proteins are coded in your

Accepted Answer

Instructions for making proteins are coded in DNA. ATP, keratin, and collagen are all proteins or protein-related molecules, but they do not contain the instructions for making proteins.

Question 7

A team of food scientists wants to develop a formula diet for newborns that is a nutritionally complete food that replaces human milk.To support normal infant development,the formula must have _____ as an ingredient.

Accepted Answer

Tryptophan is an essential amino acid and a precursor to serotonin, which plays a role in early brain development and sleep regulation in newborns. Including tryptophan in the formula can help support normal infant development. Glutamic acid, alanine, and aspartic acid are all non-essential amino acids, meaning the body can produce them on its own and they are not vital components of the formula.

Question 8

_____ is an essential amino acid.

Accepted Answer

Methionine is an essential amino acid, which means it cannot be produced by the body and must be obtained through the diet. It is important for protein synthesis, metabolism, and the production of other important molecules in the body.

Question 9

Proteins

Accepted Answer

The answer of Proteins
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Question 10

Which of the following statements is true?

Accepted Answer

Proteins in the blood, such as albumin, help maintain fluid balance by attracting and retaining water in the blood vessels.

(Note: A, C, and D are all false statements. Protein is not the primary energy source for cells, excess dietary protein is not used to form antibodies (instead, it is broken down and excreted or stored), and fibrin is involved in blood clotting while insulin is a hormone that regulates blood sugar.)

Question 11

Proteins

Accepted Answer

The answer of Proteins
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Question 12

Proteins

Accepted Answer

Proteins are composed of long chains of amino acids, which provide the building blocks for structural components of cells and tissues, enzymes, hormones, and many other biological molecules.

Question 13

A _____ remains when the nitrogen-containing portion of an amino acid is removed.

Accepted Answer

The nitrogen-containing portion of an amino acid is called the amino group (-NH2). When this group is removed, what remains is a carbon skeleton, which is essentially the backbone of the amino acid.

Question 14

A team of food scientists wants to develop a formula diet for newborns that is a nutritionally complete food that replaces human milk.To support normal infant development,the formula must have _____ as an ingredient.

Accepted Answer

Methionine is an essential amino acid that is crucial for normal infant development and must be included in a formula diet to replace human milk.

Question 15

Which of the following statements is true?

Accepted Answer

Insulin is a hormone and it is a protein.

Answer: B
 Carbohydrates are the primary sources of energy for cells, not proteins.

Answer: C
 Proteins are not directly involved in hydrogenating glucose in cell membranes.

Answer: D
 Proteins do not bind excess nitrogen in blood. Excess nitrogen is generally eliminated from the body via urine.

Question 16

Which of the following statements is true?

Accepted Answer

Structural proteins provide support and shape to cells and tissues. Keratin is a type of structural protein found in hair, nails, and the outermost layer of skin. Option A is incorrect because carbohydrates and fats are the primary sources of energy for cells. Option B is incorrect because collagen and fibrin are examples of structural proteins, not transport proteins. Option C is incorrect because excess dietary protein is broken down and eliminated by the body, not used to form antibodies.

Question 17

Every amino acid has _____ in its chemical structure.

Accepted Answer

Nitrogen is an essential element in the chemical structure of every amino acid.

Question 18

_____ is an essential amino acid.

Accepted Answer

Lysine is an essential amino acid because it cannot be synthesized by the human body and must be obtained through the diet. Serine, alanine, and aspartic acid are non-essential amino acids, meaning that they can be produced by the body.

Question 19

The "carbon skeleton" of an amino acid has the ____ attached to the anchor carbon atom.

Accepted Answer

The answer of The "carbon skeleton" of an amino acid...

Question 20

A team of food scientists wants to develop a formula diet for newborns that is a nutritionally complete food that replaces human milk.To support normal infant development,the formula must have _____ as an ingredient.

Accepted Answer

The answer of A team of food scientists wants to...

Quiz 7: Proteins: Lifes Building Blocks

Which of the following statements is true?

Which of the following statements is true?

_____ is an essential amino acid.

Which of the following amino acids is a dietary essential?

The chemical attraction between two amino acids forms a(an)

Instructions for making proteins are coded in your

A team of food scientists wants to develop a formula diet for newborns that is a nutritionally complete food that replaces human milk.To support normal infant development,the formula must have _____ as an ingredient.

_____ is an essential amino acid.

Proteins

Which of the following statements is true?

Proteins

Proteins

A _____ remains when the nitrogen-containing portion of an amino acid is removed.

A team of food scientists wants to develop a formula diet for newborns that is a nutritionally complete food that replaces human milk.To support normal infant development,the formula must have _____ as an ingredient.

Which of the following statements is true?

Which of the following statements is true?

Every amino acid has _____ in its chemical structure.

_____ is an essential amino acid.

The "carbon skeleton" of an amino acid has the ____ attached to the anchor carbon atom.

A team of food scientists wants to develop a formula diet for newborns that is a nutritionally complete food that replaces human milk.To support normal infant development,the formula must have _____ as an ingredient.