chemical reactions in living organisms

The pepsin enzyme can be added to the tube number …… to digest its contents.

• 1

• 2

• 3

• 4

Tube number 1 is similar to ………. In the digestive system of human.

• Stomach

• small intestine

• esophagus

• the mouth

If pepsin enzyme was added to the tube number 4, proteins will not be digested because:

• insuitability of pH

• insuitability of temperature

• pepsin does not digest proteins

• all the previous

If the temperature of tube 3 is adjusted, what is the enzyme that can be added to digest starch?

• Pepsin

• Amylase

• Trypsin

• Maltase

We can make sure that, tube number 1 contains proteins by adding ………….. .

• Benedict̕ reagent

• iodine solution

• Sudan-4 reagent

• Biuret̕ s reagent

If Sudan-4 reagent is added to the tube number 2, it gives ………….. colour.

• dark blue

• red

• viloet

• orange

The structures A and B are ………………. .

• monosaccharides

• disaccharides

• polysaccharides

• amino acids

One of A or B should be ………….. .

• Fructose

• ribose

• galactose

• glucose

If the disaccharide (2) is maltose, A and B should be ………….. .

• glucose and glucose

• glucose and fructose

• glucose and galactose

If the disaccharide (2) is found in the milk, A and B should be ………….. .

• glucose and fructose

• glucose and glucose

• glucose and galactose