BIOC 1420 Lecture Notes - Threonine, Basal Metabolic Rate, Blood Sugar

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Published on 30 Jan 2013
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1.) Certain amino acids are nutritionally essential and so are vitamins. In what
way(s) do they differ?
A.) The amino acids are chemically similar to each other, the vitamins
are chemically diverse.
B.) The daily requirements fir amino acids is in the order of grams, the
requirement for vitamins is milligrams or less.
C.) Amino acids are organic compounds, vitamins are minerals.
D.) All of A, B, and C are correct.
E.) Only two of A, B, and C are correct.
2.) In what way(s) does a solution for total parenteral nutrition (TPN) differ
from one for nasogastric feeding?
A.) TPN solutions contain amino acids, nasogastric solutions contain
proteins.
B.) TPN solutions contain no fats, nasogastric solutions contain fats.
C.) TPN solutions contain vitamins, nasogastric solutions contain no
vitamins
D.) All of A, B, and C are correct
E.) Only two of A, B, and C are correct
3.) A healthy child of seven years is eating a balanced diet that includes adequate
amounts of all essential nutrients. It supplies 12 grams of nitrogen per day.
How much nitrogen is she excreting per day?
A.) 12 grams
B.) More than 12 grams
C.) Less than 12 grams
D.) The amount of nitrogen can not be determined without further
investigation
4.) Negative nitrogen balance
A.) Can result when the diet is deficient in protein
B.) Means that the amount of nitrogen in urine and feces is less than
that in the diet
C.) Both A and C
D.) Neither A nor C
5.) A man of 100kg wants to lose weight. He therefor starts on an exercise
program that consumes an additional 90kcal per day, but does not change his
diet. How much weight can he expect to lose in 30 days?
A.) 9g
B.) 30g
C.) 90g
D.) 300g
E.) 900g
6.) A female student is maintaining a constant weight of 62kg by eating a diet
that supplies 2000kcal/day. Approximately how much of her energy intake is
devoted to basal metabolic rate (BMR)?
A.) 33% (1/3)
B.) 50% (1/2)
C.) 67% (2/3)
D.) 75% (3/4)
E.) 90% (9/10)
7.) We use macro nutrient conversion factors (kcal/g) to calculate energy intake
for carbohydrate, fat, and protein. These are:
A.) 4, 4, 9
B.) 4, 9, 4
C.) 4, 9, 7
D.) 4, 7, 9
E.) 4, 7, 4
8.) What essential nutrient is given to chronic alcoholics intravenously in the
event the patient requires emergency medical care due to malnutrition?
A.) Tryptophan
B.) Thiamine
C.) Threonine
D.) All of A, B, and C
E.) Only two of A, B, and C
9.) Solutions to be infused for total parenteral nutrition (TPN) contain
A.) Proteins
B.) Glucose
C.) Fats
D.) All of A, B, and C
E.) Only two of A, B, and C
10.) Amino acids are the building blocks of proteins. Which of the following is
true?
A.) All amino acids have a similar structure
B.) All amino acids have a charged R-group
C.) All amino acids are joined by disulfide bridges
D.) All of A, B, and C are true
E.) Only two of A, B and C are true
11.) When a protein is denatured
A.) Its nutritional value is destroyed
B.) Its biological activity is lost
C.) It usually becomes more soluble in water
D.) All of A, B, and C are correct
E.) Only two of A, B and C are correct
12.) Which of the following aspects of protein structure is/are most easily
disrupted when a protein is heated in a neutral solution?
A.) Peptide linkages
B.) Disulfide bridges
C.) Hydrogen bonds
D.) All of A, B, and C
E.) None of A, B and C
13.) Which of the following treatments will break disulfide bridges in proteins?
A.) Heating at 100° a pH &
B.) Heating at 100° in 6M HCl
C.) Incubation with the pancreatic protease, trypsin
D.) All of A, B, and C
E.) None of A, B, and C
14.) When protein is heated at 100°C in neutral solution, the effects is/are
A.) Breakage of peptide linkages
B.) Loss of nutritional value
C.) Loss of biological function (for example, catalysis)
D.) All of A, B, and C
E.) Only two of A, B and C
15.) Which of the following statements about normal hemoglobin (hemoglobin A)
is/are correct?
A.) The hemoglobin molecule consists of four identical subunits
B.) When a hemoglobin molecule binds one molecule of oxygen, its
affinity for binding more oxygen is decreased
C.) The iron of hemoglobin remains in the Fe2+ state in the course of
its normal functioning
D.) All of A, B, and C are correct
E.) Only two of A, B, and C are correct
16.) The binding of oxygen to hemoglobin is described as cooperative. This
means that:
A.) The affinity of hemoglobin for oxygen becomes greater as the pH is
lowered
B.) The shape of the oxygen dissociation curve of hemoglobin is
sigmoid
C.) In the presence of 2,3-bisphosphoglycerate, the affinity of
hemoglobin for oxygen is increased
D.) Hemoglobin becomes a weaker acid when it is oxygenated
E.) Hemoglobin is an effective buffer, participating in the control of
the pH of body fluids