BIOCHEMISTRY

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| By Manmacsr

Manmacsr

Community Contributor

Quizzes Created: 1 | Total Attempts: 205

Questions: 4 | Attempts: 205 | Updated: Mar 21, 2022

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Covers chemical stucture of biomoleculesmajor biomolecules are carbohydrates, lipids, proteins and nucleic acids

Questions and Answers

1.

The simplest of the hydrated carbons, with the formula (CH2O1) is called
- A.
  
  dihydroxyacetone
- B.
  
  formaldehyde
- C.
  
  pyranose
- D.
  
  Glyceraldehyde
Correct Answer
D. Glyceraldehyde

Explanation
glyceraldehyde fulfills the definition of carbohydrate: "polyhydroxyaldehydes or ketones". It has an aldehyde (-CHO) and 2 (i.e. poly) hydroxyl (-0H) groups.

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1
2.

As a rule, the number of isomers that a sugar has depends on
- A.
  
  the number of chiral carbons
- B.
  
  the kind of substituents
- C.
  
  the number of alcohol groups present
- D.
  
  its anomeric carbon
Correct Answer
A. the number of chiral carbons

Explanation
the number of isomers is equal to the square of the number of chiral or assymetric carbon atoms (n raised to 2nd power). Thus glucose has 4 chiral carbons; its isomers total 16 (4 raised to the power 2).

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3.

'Which of the following statements best characterize glucose?
- A.
  
  it usually exists in the furanose form
- B.
  
  it is a ketose
- C.
  
  it forms part of the disaccharide sucrose
- D.
  
  Only the L-isomer can be transported into mammalian cells
Correct Answer
C. it forms part of the disaccharide sucrose

Explanation
glucose is an aldose (not ketose), the predominantly naturally occuring isomers are the D-isomers which are easily transported into mammalian cells

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4.

All of the following are composed exclusively of glucose, EXCEPT:
- A.
  
  amylose
- B.
  
  lactose
- C.
  
  cellulose
- D.
  
  Maltose
- E.
  
  glycogen
Correct Answer
B. lactose

Explanation
lactose is made up of glucose + galactose; all the others are made up of glucose only

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Current Version
Mar 21, 2022

Quiz Edited by
ProProfs Editorial Team
Apr 07, 2009

Quiz Created by
Manmacsr

Biochemistry

The simplest of the hydrated carbons, with the formula (CH2O1) is called

As a rule, the number of isomers that a sugar has depends on

'Which of the following statements best characterize glucose?

All of the following are composed exclusively of glucose, EXCEPT: