Proteins and Amino Acids Quiz

Protein denaturation can alter the three-dimensional shape of a protein. decrease the nutritional value of a protein. alter the sequence of amino acids in a protein. break the peptide bonds holding a protein together

alter the three-dimensional shape of a protein.

Which does NOT require amino acid deamination? metabolizing amino acids to produce energy manufacturing enzymes producing glucose from amino acids converting amino acids to fat

manufacturing enzymes

Which of the following terms can be used to describe a protein? polypeptide monopeptide polysaccharide glycogen

polypeptide

Vegetarians have a lower risk of diabetes. cardiovascular disease. high blood pressure. All answer choices are correct

All answer choices are correct

One reason to get more of your protein from plants would be to get more fibre. to get more poly and mono unsaturated fats. to lower blood cholesterol. All answer choices are correct.

All answer choices are correct.

Vegan vegetarians may not get enough of which nutrient? iron vitamin B12 calcium and vitamin D all these nutrients could be low

All these nutrients could be low

Individuals with the genetic disorder phenylketonuria (PKU) should limit their intake of foods containing carbohydrate. iron. monosodium glutamate. Aspartame.

Aspartame

Which statement best describes why urea is synthesized? Deamination produces ammonia, which is insoluble in the blood. Deamination produces ammonia, which is non-toxic, but can only be excreted after conversion to urea. Deamination produces ammonia, which is toxic and must be converted to urea in the liver. Deamination produces ammonia which is toxic and must be converted to urea in the kidney.

Deamination produces ammonia, which is toxic and must be converted to urea in the liver.

Which statement about amino acid absorption is false? Each amino acid has its own specific transport system. Groups of similar amino acids share the same transport system. If one amino acid is supplemented, it can slow the absorption of other amino acids. Dipeptides and tripeptides are broken down to amino acids before leaving the mucosal cells of the small intestine

Each amino acid has its own specific transport system.

Which statement best describes the cause of sickle cell anemia? It is caused by insufficient protein in the diet. It is caused by a dietary deficiency of an essential amino acid. It is caused by a change in the amino acid sequence in hemoglobin. It is caused by changes in red blood cells that occur with aging.

It is caused by a change in the amino acid sequence in hemoglobin.

Which statement about sources of protein is false? Animal sources of protein are used more efficiently by the human body than plant sources. It is difficult to meet most people's protein requirements without consuming animal proteins. Legumes provide about as much protein per ½ cup serving as a cup of milk. Plant sources of protein can easily meet most people's protein requirements.

It is difficult to meet most people's protein requirements without consuming animal proteins.

Which of the following can result from a deficiency of protein and energy? PKU. Marasmus. kidney stones. All answer choices are correct.

Marasmus.

Which of the following is a true statement? Most Canadians do not have enough protein in their diet. The Canada's Food Guide recommends the consumption of large amount of red meat to satisfy the needs in protein. The amount of protein used by the body is estimated by calculating nitrogen loss from the body. All answer choices are correct.

The amount of protein used by the body is estimated by calculating nitrogen loss from the body.

Hemoglobin is an example of a defense protein. a transport protein. an enzyme. an immune protein (antibody).

a transport protein.

Complete protein sources can be found in which type of foods? oils fruits dairy products grains

dairy products

To estimate protein requirements, you must know a person's body weight. urinary output. height. All answer choices are correct

body weight.

The enzymes trypsin and chymotrypsin break large polypeptides into smaller peptides. are needed to denature proteins. rearrange the sequence of amino acids in a polypeptide. are needed to make nonessential amino acids.

break large polypeptides into smaller peptides.

Excessive intake of animal protein foods could cause excessive bone mineralization, causing brittleness. a diet to be too low in energy. increased waste production overworking the liver. an increased risk of heart disease.

increased waste production overworking the liver.

Which of the following groups has the highest protein requirements (amount of protein required per unit of bodyweight)? infants adults who exercise adult women adult men

infants

Food allergies can result when a protein in the diet is not absorbed and is eliminated in the feces. is filtered out of the blood and into the urine. is absorbed without being completely digested. provides amino acids that are not found in the human body.

is absorbed without being completely digested.

A limiting amino acid does not supply the element nitrogen. is present in short supply relative to the body's need. cannot be used by the body during protein synthesis. is used to synthesize nonprotein molecules that contain nitrogen.

is present in short supply relative to the body's need.

Which term best describes the continuous synthesis and breakdown of body proteins? deamination amino acid pool translation protein turnover

protein turnover

The three-dimensional shape of a protein is determined by the ratio of nonessential to essential amino acids present in the polypeptide chain. sequence of amino acids in the polypeptide chain. carbon to nitrogen ratio in the polypeptide chain. the number of peptide bonds present in the polypeptide chain.

sequence of amino acids in the polypeptide chain.

Where does protein digestion begin? mouth small intestines stomach liver

stomach

Which of the following is NOT true about amino acids? they synthesize glucose they can be converted to fat they are comprised of only three elements: carbon, hydrogen, and oxygen they are energy-yielding

they are comprised of only three elements: carbon, hydrogen, and oxygen