Carbohydrates

which of the following represents assymetrical disaccharide and is present in the plant cells?

• maltose

• lactose

• sucrose

• glucose

Answer explanation

both maltose and sucrose can be found in plant cell,

maltose in malt plant but we will not choose it bec it consists of two symmetrical glucose

we will choose sucrose as it's found in sugarcane plant and it consists of assymetrical molecules which are glucose and fructose

which of the following molecules contain carbon atom?

• water

• table salt

• Ammonia

• Glucose

Answer explanation

we will choose glucose as it's an organic molecule so it's must contain carbon

water is H2O , ammonia is NH3 and table salt is NaCl, they are inorganic molecules

what is the least number of hydrogen atoms that share in monosaccharide formation?

• 4

• 6

• 8

• 10

Answer explanation

the number of carbon in monosaccharide is from 3 to 6 atoms

as number of hydrogen atoms is double the number of carbon, so that the umber of hydrogen atom will be 6 , 8 , 10 or 12 (the least number is 6)

The following diagram illustrates a plant complex sugar:

what does this figure represents?

• starch

• glycogen

• sucrose

• lactose

Answer explanation

glycogen is the complex sugar stored in the liver of human and and animals. while, starch is the complex sugar that stored in plant

waht is the similarity between galactose and lactose?

Answer explanation

both of them are simple sugar

soluble in water

you have 3 carbohydrates (A, B & C). if A and B belong to the same group of substances, and A is a part of B. and C is produced from the combination of several molecules of compound A. which of the following represents A, B and C respectively?

• glucose/fructose/sucrose

• glucose/maltose/starch

• glucose/galactose/lactose

• glucose/glycogen/sucrose

Answer explanation

glucose and maltose are from the same group which is simple sugar

glucose is part of maltose as maltose consists of two molecules of glucose

starch is formed from combination of several molecules of glucose

"monosacharides have the same molecular weight" how far is this statement correct? with explaination

Answer explanation

the statement is wrong as all monosaccharides consist of one molecule but the number of carbon atom may vary between 3 to 6 thus the nuber of hydrogen and oxygen will vary.

The general formula of monosacharides is (CH2O)n and the chemical formula of glucose sugar is C6H12O6, which of the following may refer to letter n?

• the number of hydrogen atoms exist in sugar

• the number of carbon atoms that enter in the structure of sugar

• the number of chemical bonds among the atoms of elements

• the number of OH groups that linked to carbon atoms

which of the following represents the correct arrangement for the components of a multicellular living organism from the simplest to the most complex

• cells/polymers/organelles/tissue

• polymers/cells/organelles/tissue

• organelles/polymers/cells/tissues

• polymers/organelles/cells/tissue

from the following diagram

if X is a sugar that is produced from the photosynthesis process and Z is found in milk. what does each of X , Y and Z represent respectively

• fructose/glucose/sucrose

• glucose/fructose/sucrose

• glucose/galactose/lactose

• galactose/glucose/maltose