Biology · Chemistry

Carbohydrates and Biomolecules

986 Questions

Carbohydrates and biomolecules questions test your understanding of sugars, monosaccharides, and metabolic substrates. The topic covers food transportation in plants and the biochemical properties of sweeteners. Practicing these questions builds a strong foundation for exam preparation.

Disaccharides and monosaccharidesArtificial sweetenersGlycogen storagePlant food transportGlycoprotein hormones

Carbohydrates and Biomolecules Questions

Multiple choice biology endocrine glands different type of gland glands in humans coordination in human beings- chemical control

Diosgenin is

  1. Saccharide

  2. Steroid

  3. Amino acids

  4. Peptide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diosgenin, a plant steroid sapogenin. Diosgenin is the product of hydrolysis by acids, strong bases, or enzymes of saponins which are extracted from the tubers of Dioscorea wild yam. Diosgenin is used for the commercial synthesis of cortisone, pregnenolone, progesterone, and other steroid products. 

So, the correct answer is 'Steroid'.

Multiple choice evs farming brings prosperity agriculture and types of crops crop management management of crops in india

On storage, the sweetness of corn is lost due to conversion of soluble sugars into polysaccharide. If corn is immersed after harvest in boiling water and cooled, the sweetness remains because the.

  1. Polysaccharide is re-converted into soluble sugars

  2. Concentration of sugar increases due to heating

  3. Conversion of sugars to polysaccharide stops

  4. Enzymes responsible for the conversion are destroyed
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fresh corn is sweet due to high sugar content, but enzymes rapidly convert these sugars into tasteless polysaccharides after harvest. Immersing the corn in boiling water denatures and destroys these enzymes, preserving the sweetness.

Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

Which of the following is soluble in water ?

  1. salt

  2. sugar

  3. oxygen

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Salt and sugar are soluble in water and form solution with water. Oxygen is also water soluble because the aquatic animals are able to breathe because oxygen is present in the dissolved form. As temperature increases solubility decreases, that's why in Eutrophication there is high BOD.(Biological Oxygen Demand)

Multiple choice expression of gene inherited changes biology

Lac-operon is related with _______

  1. Lactose metabolism

  2. Starch metabolism

  3. Lipid metabolism

  4. Protein metabolism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lac-operon refers to the group of genes present in bacteria that are responsible for the metabolism of lactose. There are three genes called LacZ, LacY and LacA that code of beta-galactosidase, permease and transacetylase respectively. They have a common promoter, operator and a regulator gene.

Hence, the correct answer is 'Lactose metabolism'

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

One of the most resistant biological material is

  1. Lignin

  2. Hemicellulose

  3. Lignocellulose

  4. Sporopollenin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The exine of the pollen grains consist most resistant biological material known as sporopollenin. It is resistant to both microbial and chemical decomposition by which it preserves pollen grains during fossilaization.

So, the correct option is 'Sporopollenin'.

Multiple choice biology windows of knowledge human tongue organ of taste tongue : the organ of taste

Milk contains a sugar called

  1. Galactose

  2. Lactose

  3. Maltose

  4. Sucrose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Galactose is a monosaccharide sugar as sweet as glucose. It is found in butter, butter milk, buttermilk, cheese, cream and gums.
B. Lactose is a disaccharide sugar composed of galactose and glucose. Lac in Latin means milk. It comprises about 2-8 % of milk by weight so, it is important constituent of milk. It is also called as milk sugar. Other sources are buttermilk, cheese and cream.
C. Maltose is a disaccharide sugar composed of two units of glucose. It is found in germinating seeds, also called as malt sugar. It is found in cereals, pizza, and bread products.
D. Sucrose is a disaccharide sugar composed of glucose and fructose. It is also called as table sugar. It is found in sugarcane.
So, the correct answer is 'Lactose'.
Multiple choice geography australia - location, political divisions and physical features australia australia australia - geographical features

White sugar, brown sugar, castor sugar, syrup and treacle are different types of ___________.

  1. raw sugar

  2. refined sugar

  3. sugarcane

  4. Both a and b
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Refined sugar,

Refined sugar comes from sugar cane or sugar beets, which are processed to extract the sugar. It is typically found as sucrose, which is the combination of glucose and fructose. We use white and brown sugars to sweeten cakes and cookies, coffee, cereal and even fruit.

Multiple choice chemistry biochemistry enzymes and hormones hormones coordination in human beings- chemical control

The enzyme that is not associated in the preparation of $C _{2}H _{5}OH$ from starch is:

  1. maltase

  2. diastase

  3. invertase

  4. zymase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Starch is hydrolyzed to Maltose by an enzyme called diastase
Maltase converts Maltose to Glucose
Zymase converts Glucose to ethanol.
So the enzyme that is not associated in the preparation of ${C} _{2}{H} _{5}OH$ from starch is invertase
Multiple choice zoology structure of chromosome, cell cycle and cell division structure of dna nucleic acid heredity and inheritance

Sugar found in DNA is

  1. Dextrose

  2. Levulose

  3. Glucose

  4. Deoxyribose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
DNA has deoxyribose sugar while RNA has ribose sugar. The deoxyribose sugar has hydrogen at second carbon while the ribose sugar has the hydroxyl group at the second carbon of the hexose ring. Ribose sugar is a monosaccharide which has five carbon atom. C$ _5$H$ _{10}$O$ _5$ is the chemical formula of ribose and it is a pentose sugar. 
So, the correct answer is option D.
Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

The bacterial cell wall is made up of 

  1. Cellulose

  2. Hemicellulose

  3. Cellulose and hemicellulose

  4. Peptidoglycan

  5. Glycogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Peptidoglycans (or mucopeptide or glycopeptide or murein) are the structural elements of almost all bacterial cell walls. They constitute as much as 95% of the cell wall in some Gram positive bacteria to as little as 5 to 10% in Gram negative bacteria. Peptidoglycans are made up of a polysaccharide backbone consisting of alternating muramic acid and glucose amine residues in equal amounts.

Multiple choice botany option b: biotechnology and bioinformatics gram staining microbiology: organisms in industry cell wall and cell membrane

Bacterial cell wall is composed of peptidoglycan, a complex of oligosaccharides and proteins.        The oligosaccharide component consist of _________

  1. Linear chain of alternating NAG and NAM linked by ${\alpha}$ (1 -4) linkage
  2. Linear chains of alternating NAG and NAM linked by ${\beta}$ (1-4) linkage.
  3. Linear chain of glucose linked by $4{\beta}$ (1-4) linkage.
  4. Linear chain of glucose linked by ${\alpha}$ (1-4) linkage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The oligosaccharide component of bacterial cell wall consists of linear chains of alternating NAG and NAM linked by ${\beta}$ (1-4)linkage.

Multiple choice botany option b: biotechnology and bioinformatics gram staining microbiology: organisms in industry cell wall and cell membrane

Glycocalyx is

  1. Glycoproteins and glycolipids

  2. Oligosaccharide part of glycolipids and glycoproteins

  3. Lipid and protein parts of glycolipids and glycoproteins

  4. Mucopolysaccharides attached to cell wall.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Glycocalyx or pericellular matrix is a carbohydrate-enriched coating of glycoprotein and a glycolipid that covers the cell membranes of few bacteria, epithelial cells and other cells. 
  • It is mainly used in the recognition of the cell (distinguish between healthy and diseased cells) and also regulates the endothelial vascular tissues.
  • So, the correct answer is 'Oligosaccharide part of glycolipids and glycoproteins'.