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St. George's University - School of Medicine - First Term - Biochemistry

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Biochemistry - Lecture 24 - Structure and function of carbohydrates

Pregunta 1 de 8

1

What is an example of an epimer?

Selecciona una de las siguientes respuestas posibles:

  • Two sugars that are mirror images of each other.

  • Sucrose and Lactose

  • Mannose and Galactose

  • Glucose and Fructose

  • Glucose and Mannose

Explicación

Pregunta 2 de 8

1

A 5 year old male patient is seen for difficultly with vision. After testing, diabetes is ruled out but the physician informs the parents that their child has a hereditary disease. As part of the treatment regimen the child must avoid consuming certain sugars, such as:

Selecciona una de las siguientes respuestas posibles:

  • Maltose

  • Lactose

  • Glucose

  • Mannose

  • Starch

Explicación

Pregunta 3 de 8

1

A healthy SGU medical student, Bob, is practising using CliniTest on his own urine. His fellow student, Alice, decides to prank Bob by adding sugar to Bob's sample when Bob is not looking. Much to Alice's disappointment, Bob's test does not indicate any sugar in his urine. What sugar did Alice use?

Selecciona una de las siguientes respuestas posibles:

  • Maltose

  • Fructose

  • Sucrose

  • Lactose

  • Glucose

Explicación

Pregunta 4 de 8

1

What is the type of linkage between the sugar and base of a nucleotide/nucleoside?

Selecciona una de las siguientes respuestas posibles:

  • β-N-glycosidic linkage

  • α(1->4) glycosidic linkage

  • α-N-glycosidic linkage

  • β-O-glycosidic linkage

  • α(1->2) glycosidic linkage

Explicación

Pregunta 5 de 8

1

A 2 year child is diagnosed with fructosuria and the physician recommends the child avoid consuming sucrose. Why is sucrose considered a non-reducing sugar?

Selecciona una de las siguientes respuestas posibles:

  • Because carbon-1 of glucose and the carbon-2 of mannose are involved in the glycosidic linkage.

  • Sucrose cannot engage in mutarotation.

  • Sucrose does not have an available carbon-4.

  • The aldehyde of glucose and the aldehyde of fructose are not free.

  • Because sucrose cannot reduce copper from Cu3+ to Cu2+.

Explicación

Pregunta 6 de 8

1

Which amino acid can support an N-linked glycosolation?

Selecciona una de las siguientes respuestas posibles:

  • Serine

  • Threonine

  • Asparagine

  • Glutamine

  • Cysteine

Explicación

Pregunta 7 de 8

1

A 60 year old female patient sees a physician at a walk-in clinic for a checkup. The patient is mostly healthy, but complains of constipation. The physician recommends increasing the patient's daily intake of dietary fibre. Why are humans unable to dietary fibre?

Selecciona una de las siguientes respuestas posibles:

  • We can't digest β(1,4) glucose linkages of starch.

  • We can't digest β(1,4) fructose linkages of cellulose.

  • We can't digest α(1,4) glucose linkages of cellulose.

  • We can't digest β(1,4) glucose linkages of cellulose.

  • We can't digest β(1,4) glucose linkages of lactose.

Explicación

Pregunta 8 de 8

1

A 2-year-old patient is suspected of having fructosuria, which is a hereditary intolerance of fructose. What sugar should the physician recommend the patient's parents avoid?

Selecciona una de las siguientes respuestas posibles:

  • An aldose.

  • An isomer of fructose.

  • A sugar molecule with no free anomeric carbon.

  • An enantiomer of glucose.

  • A sugar with a β1→4 glycosidic linkage.

Explicación