Amino Acids and Proteins

A nutritionist is designing a diet plan for a vegetarian athlete to ensure they receive all essential amino acids. Which strategy would best ensure the athlete gets a complete amino acid profile from plant-based foods?

• Consuming only one type of legume daily

• Combining different plant protein sources such as beans and rice throughout the day

• Relying solely on fruit for protein intake

• Avoiding grains to reduce carbohydrate intake

A patient has a genetic disorder that impairs the function of tRNA molecules during translation. Predict how this would impact protein synthesis and the resulting proteins.

• Proteins would be synthesized faster

• Protein synthesis would be disrupted, leading to incomplete or malfunctioning proteins

• Only non-essential amino acids would be affected

• There would be no impact on protein synthesis

A food scientist is tasked with increasing the protein quality of a plant-based burger. Which approach would most effectively improve its amino acid profile?

• Adding more salt to enhance flavor

• Supplementing with a protein source rich in limiting essential amino acids

• Increasing the fat content

• Removing all carbohydrates

If a person’s diet lacks tryptophan, an essential amino acid, what metabolic and nutritional consequences might arise?

• The body will synthesize tryptophan from glucose

• Protein synthesis may be impaired, and serotonin production could decrease

• There will be no effect since the body stores excess amino acids

• Only muscle mass will increase

A researcher is comparing the metabolic fates of amino acids in a fasting versus a fed state. What reasoning best explains the difference in amino acid metabolism between these two states?

• In the fed state, amino acids are primarily used for energy production

• In the fasting state, amino acids are more likely to be deaminated and used for gluconeogenesis

• In both states, amino acids are only used for protein synthesis

• In the fasting state, amino acids are stored as glycogen

A chef wants to create a high-protein meal for individuals with phenylketonuria (PKU), a disorder where phenylalanine cannot be metabolized. Which planning strategy should the chef use?

• Use protein sources high in phenylalanine

• Select protein sources low in phenylalanine and supplement with other essential amino acids

• Eliminate all protein from the meal

• Only use animal-based proteins

A dietitian is evaluating two foods: one contains all essential amino acids, and the other lacks lysine. How should the dietitian advise a client who relies on the second food as their main protein source?

• Continue as is; all proteins are equivalent

• Combine the second food with another food rich in lysine to achieve a complete protein profile

• Avoid all protein sources

• Only eat the second food

A biochemist is studying the effect of a high-protein diet on nitrogen balance. What reasoning explains why excess dietary protein can lead to increased urea production?

• Excess protein is stored as urea in the body

• Amino acids are deaminated, and the resulting ammonia is converted to urea for excretion

• Urea is produced only when carbohydrates are low

• Urea production decreases with high protein intake

A food manufacturer wants to market a new protein bar as a “complete protein” source. What evidence should they provide to support this claim?

• The bar contains only plant-based ingredients

• The bar provides all nine essential amino acids in adequate amounts

• The bar is high in carbohydrates

• The bar is low in fat

A person is following a diet that excludes all animal products. What planning should they do to ensure they meet their essential amino acid requirements?

• Eat only one type of vegetable daily

• Combine various plant-based protein sources to complement amino acid profiles

• Avoid legumes

• Rely solely on fruit for protein