In comparison to the well-defined structure of starch, which of the following is the most important factor that allows for the synthesis of thousands of different proteins?
Number of different amino acids
After digestion of proteins, what products are absorbed into the circulation?
Free amino acids, and a few dipeptides and tripeptides
All of the following are fates of amino acids in the intestinal tract except
some may be used for synthesis of gastric protease
Your cousin Wanda was born with a genetic defect affecting her digestion, namely, a lack of intestinal villus tripeptidases and dipeptidases. Which of the following digestive processes would not take place?
Peptides → amino acids
All of the following describe associations between protein nutrition and the body's water balance except
excessive protein losses by the kidney may lead to dehydration
How many grams of nitrogen are contained in a 2500-kcalorie diet that provides 15% of the energy as protein?
What is the process whereby an amino group is combined with a keto acid to form an amino acid?
Which of the following describes the state of nitrogen balance for a normal, healthy 35-year-old person who weighs 60 kg and consumes a diet that provides 75 g of protein and adequate energy?
Relative to animal proteins, which of the following amino acids is present in lesser amounts in proteins of legumes?
Which of the following is associated with the presence of tissue edema in kwashiorkor?
Low concentration of blood protein
Which of the following conditions is associated with edema?
Diminished concentration of blood proteins and hormones, which causes fluid to leak from the blood vessels
Supplements of which of the following amino acids are reported to lower blood pressure and reduce homocysteine levels?
Which of the following is a feature of homocysteine?
It is increased in the blood of coffee drinkers
Which of the following describes a relationship between protein/amino acids and heart disease?
Elevated blood homocysteine levels are associated with smoking cigarettes and drinking alcohol
In relation to the range of protein intake as a percentage of energy intake, what would be the highest safe level of protein intake for a 60-kg adult ingesting 2500 kcalories?
Which of the following describes a relationship between protein intake and calcium metabolism?
Calcium excretion rises with increasing intake of animal-derived proteins
If protein needs are expressed per kilogram of body weight, which of the following describes the requirements of infants?
Greater than adults
What is the percentage of total energy derived from protein in a diet containing 50 grams of protein and 2000 kcalories?
If a person consumes 65 grams of protein and a total of 2700 kcalories per day, approximately what percentage of energy would be derived from protein?
In photosynthesis, the plant uses energy from the sun, plus water and carbon dioxide, to synthesize
What term is specific to reactions in which simple compounds are combined into more complex molecules?
Which of the following reactions is an example of an anabolic reaction?
Cholesterol synthesis from acetyl CoA molecules
Approximately what percentage of the body's energy expenditure is furnished by amino acids?
10 to 15
Which of the following nutrients can be made from compounds composed of 2-carbon skeletons?
Which of the following dietary components cannot be used to synthesize and store glycogen?
When energy-yielding nutrients are consumed in excess, which one(s) can lead to storage of fat?
Fat, carbohydrate, and protein
If the carbohydrate content of the diet is insufficient to meet the body's needs for glucose, which of the following can be converted to glucose?
When protein consumption is in excess of body needs and energy needs are met, the excess amino acids are metabolized and the energy in the molecules is
stored as glycogen and fat.
Which of the following accounts for the higher energy density of a fatty acid compared with the other energy-yielding nutrients?
Fatty acids have a greater percentage of hydrogen-carbon bonds
Approximately how many ATP molecules are synthesized from the complete oxidation of a molecule of palmitic acid?
How does excess carbohydrate intake contribute to obesity?
It spares oxidation of body fat and dietary fat
All of the following are features of the metabolism of surplus dietary carbohydrate in human beings except
It spares oxidation of body fat and dietary fat
ll of the following are features of the metabolism of surplus dietary carbohydrate in human beings except
excess glucose is oxidized only very slowly.
During the first few days of a fast, what energy source provides about 90% of the glucose needed to fuel the body?
Adverse side effects of typical low-carbohydrate diets include all of the following except
high blood pressure
Which of the following plays a major role in regulating the elimination of alcohol from the body?
Liver alcohol dehydrogenase
The Wernicke-Korsakoff syndrome in people with chronic alcohol abuse stems primarily from a deficiency of