Biology · Chemistry

Carbohydrates and Biomolecules

1,073 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 digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

Choose the wrong enzymatic reaction. 

  1. Sucrose $\overset{Invertase}{\rightarrow}$ Glucose + Fructose
  2. Lactose $\overset{Lactase}{\rightarrow}$ Glucose + Fructose
  3. Pepsinogen $\overset{HCI}{\rightarrow}$ Pepsin
  4. Maltose $\overset{Maltase}{\rightarrow}$ Glucose + Glucose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct answer is (b).

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Choose the correct answers from the alternatives given :
In certain organisms and under certain conditions, which of the following can be used as an energy alternative to glucose

  1. fatty acids

  2. glycerol

  3. amino acids

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • in certain conditions such as starvation when sufficient amount of glucose is not present in the blood the foremost priority of the body is to provide brain with the sufficient amount of glucose.
  • So for the other body parts the energy that is to be provided can be done by the use of other substrates instead of glucose.
  • First alternative of glucose is fatty acid which is stored in the body. These fatty acid molecules are converted to acetyl coA by the process of beta oxidation and used in the kerbs cycle to provide the cell with energy.
  • Glycerol is also a fatty acid which is used as the other fatty acid in the kerbs cycle.
  • Amino acids are the part of protein molecules which are usually not stored in the body but can be used in the kerbs cycle whenever they are provided to the cell.
  • Therefore the answer 'all of these' is correct.
Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Incomplete breakdown of glucose in muscles results in the formation of 

  1. Alcohol and water

  2. Alcohol and lactic acid
  3. ${CO _2}$ and Water

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

The type of fuel used during physical activity also depends on the efficiency with which oxygen is delivered to muscle cells. The complete breakdown of glucose occurs when $O _2$ is present which is called as aerobic metabolism. When $O _2$ is unavailable, glucose breakdown is incomplete and it results in the formation of lactic acid. Accumulation of lactic acid leads to sore muscles. 
Incomplete breakdown of glucose does not result in the formation of alcohol, water or $CO _2$. 

Thus, the correct answer is option D.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Enzyme that changes glucose to ethyl alcohol is

  1. Zymase

  2. Diastase

  3. Invertase

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

A) Zymase causes the breakdown of sugars into alcohols.

B) Diastase catalyses the breakdown of starch into maltose.
C) Invertase is an enzyme that catalyses the breakdown of sucrose into fructose and glucose.
D) Maltase breaks down maltose to glucose.
So the correct answer is 'Zymase'

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Mark the correct statement

  1. Sugar inhibits the growth of bacteria which enhances the activity of enzymes

  2. Sugar inhibits the growth of microbes which inhibits the growth of bacteria that spoil food

  3. Sugar reduces the rate of enzyme activity

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

Jams, jellies, squashes are preserved by sugar. Sugar reduces the moisture content which inhibits the growth of bacteria which spoils food.

Multiple choice biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

Which one of the following pair is wrongly matched?

  1. Detergents - lipase

  2. Alcohol - nitrogenase

  3. Fruit juice - pectinase

  4. Textile - amylase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This question relates to the industrial applications of enzymes. Alcohol is not produced by the use of nitrogenase. Nitrogenase performs complex functions of nitrogen fixation by bacteria. Alcohol is produced by the fermentation process of sugars carried out by Yeast.

Multiple choice biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

An enzyme which catalyses the conversion of aldose sugar to ketose would be classified as

  1. Transferases

  2. Isomerases

  3. Hydrolases

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

Isomerases are the enzymes which catalyse transfer of groups within molecules to yield isomeric bonds. As aldose and ketose sugars are isomers, their interconversion is catalyzed by isomerases.

Transferases will catalyze group transfer reactions. 
Hydrolases will catalyze hydrolytic reactions and ligases catalyze formation of C-C, C-S, C-O and C-N bonds by condensation reactions coupled to ATP cleavage.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Which of the following is/are soluble in water?

  1. Ghee

  2. Curd

  3. Blood

  4. Sugar
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation
Sucrose or sugar is a polar compound which can break the H-bond present in water due to this reason sugar can dissolve in water . 
Blood is a colloid or suspension composing red blood cells floating in a liquid plasma.If we add it to water, the plasma disperses in the water, becoming more dilute.
Oil and ghee are non-polar in nature as a result they can't interact with a polar solvent like water hence they are insoluble in water.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Which of the following compounds is known as sugar of lead?

  1. $PbSO _4$
  2. $PbCO _3$
  3. $(CH _3COO) _2Pb$
  4. $PbCl _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lead (II)acetate also known as sugar of lead,salt of saturn and Goulard's powder is a white crystalline chemical compound with a sweetish taste. It is made by treating lead ($II$) oxide with acetic acid.

Multiple choice biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

Secondary metabolite is

  1. Sugar

  2. Glucose

  3. Antibiotics

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Secondary metabolites, including antibiotics, are produced in nature and serve survival functions for the organisms producing them. Secondary metabolites serve: (i) as competitive weapons used against other bacteria, fungi, amoebae, plants, insects, and large animals; (ii) as metal transporting agents; (iii) as agents of symbiosis between microbes and plants, nematodes, insects, and higher animals; (iv) as sexual hormones; and (v) as differentiation effectors. Although antibiotics are not obligatory for sporulation, some secondary metabolites (including antibiotics) stimulate spore formation and inhibit or stimulate germination.