Cut surfaces of fruit and vegetables often become dark because

(1) dirty knife makes it dark

(2) oxidation of tannic acid in the presence of a trace of iron from the knife makes it dark

(3) dust of the air makes it dark

(4) none of the above

Subtopic:  Element Analysis |
 91%
AIIMS - 2008
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The biological organisation starts with:

1. Submicroscopic molecular level

2. Cellular level

3. Organisms level

4. Atomic level

Subtopic:  Element Analysis |
 53%
AIPMT - 2007
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Which element is present negligible in human body?

1. O

2. C

3. H

4. Si

Subtopic:  Element Analysis |
 95%
From NCERT
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Which of the following is not strictly a biomacromoles?

1. Proteins

2. Lipids

3. Polysaccharides

4. Nucleic acid

Subtopic:  Element Analysis | Introduction |
 91%
From NCERT
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A secondary metabolite that acts as a toxin is

1. Carotenoids

2. Curcumin

3. Abrin

4. Monoterpenes

 

 

Subtopic:  Element Analysis |
 88%
From NCERT
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A secondary metabolite that is alkaloid in nature is

1. codeine

2. Anthocyanin

3. Gum

4. Abrin

Subtopic:  Element Analysis |
 81%
From NCERT
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Which of the following organic molecule is not correctly matched with diagrammatic representation of its structure?
 
1. Alanine
2. Palmitic acid  \(CH_3 - {(CH_2)}_{14} - COOH\)
3. Glycerol  
4. Adenylic acid  
Subtopic:  Element Analysis |
 74%
From NCERT
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If we compare percentage weight of elements present in Earth’s crust and the Human body, which of the following would be present in the largest percentage in both?
1. Carbon
2. Oxygen
3. Hydrogen
4. Nitrogen
Subtopic:  Element Analysis |
 68%
From NCERT
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Arrange the following elements present in human body in their ascending order of occurrence [begin with the element found in the lowest percentage]:
Hydrogen, Carbon, Oxygen, Nitrogen, Calcium
1. Carbon, Oxygen, Nitrogen, Calcium, Hydrogen
2. Calcium, Hydrogen, Nitrogen, Oxygen, Carbon
3. Hydrogen, Calcium, Nitrogen, Oxygen, Carbon
4. Hydrogen, Calcium, Nitrogen, Carbon, Oxygen
Subtopic:  Element Analysis |
 68%
From NCERT

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Amongst the following, the element constituting the least percent of the weight of human body is:
1. Oxygen
2. Carbon
3. Hydrogen
4. Nitrogen
 
Subtopic:  Element Analysis |
 55%
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