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 factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

The raw materials needed for respiration are

  1. Glucose and $O _2$.
  2. Glucose and $CO _2$.

  3. Glucose and carbon.

  4. Glucose and sucrose.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Respiration is a process in which glucose is oxidised to release carbon dioxide, water and energy in the presence or absence of oxygen by a multistep reaction.

So, the correct answer is 'Glucose and O$ _2$'.

Multiple choice biology food components and nutrition simple test for nutrients test for nutrients protein and its function

X is one of the important components of food. Wheat, pearl millet and sweet potato are rich sources of X, X gives a blue-black colour with a dilute solution of iodine. Identify X.

  1. Minerals

  2. Fats

  3. Proteins

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

  • Starch gives blue-black colour with Iodine and is used as a test. Starch is a polysaccharide(carbohydrate).

So, the correct option is 'Carbohydrates'.

Multiple choice evs food components simple test for nutrients test for nutrients protein and its function energy from different food components nutrients and foodstuffs

Which carbohydrate gives red colour when iodine solution is added to it?

  1. Starch

  2. Glycogen

  3. Dextrin

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

Iodine test is used to distinguish between the presence of starch and glycogen and other saccharides.
When starch solution is treated with iodine, it gives a blue color. The blue color develops because of the trapping of iodine in the helical coils of amylose. When this test solution is heated, the color disappears due to disruption of the helical coils of amylose and the color reappears upon cooling, due to the reformation of helical coils. Glycogen however gives red color with iodine.
Therefore, the correct answer is option B.

Multiple choice evs food components simple test for nutrients test for nutrients protein and its function energy from different food components nutrients and foodstuffs

Choose the correct answer from the alternatives given.
If an animal needed to store energy for long-term use, but not be encumbered with the weight of extra.tissue, which is the best molecule for storage?

  1. Fructose and glucose in the form of honey

  2. High-calorie fat molecules

  3. Complex cellulose molecules

  4. Glycogen with extensive side branches of glucose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If an animal needed to store energy for long-term use, but not be encumbered with the weight of extra tissue, then high-calorie fat molecules are the best molecules for storage. So, the correct answer is "high-calorie fat molecules".

Multiple choice chemistry chemical reactions of organic compounds uses of alcohols commercially important alcohols - ethanol some commercially important alcohols commercially important alcohols - methanol methanol

Glucose or fructose is converted into $C _2H _5OH$ in the presence of: 

  1. invertase

  2. diastase

  3. maltase

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

Alcoholic fermentation converts one mole of sucrose into two moles of ethyl alchohol, also known as ethanol and two moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical reaction for fermentation of alcohol is as follow:

 $C _6H _{12}O _6+ Zymase\rightarrow 2 C _2H _5OH + 22CO _2$

Multiple choice zoology biotechnology: general introduction application of biotechnology miscellaneous applications of biotechnology application of biology in therapy and vaccine

The commercial blood glucose biosensor uses which of the following enzymes?

  1. Glucokinase

  2. Glucose oxidase

  3. Phosphofructokinase

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

Glucose oxidase is widely used for the determination of free glucose in body fluids and in the food industry. It also has many applications and typically enzyme assays for biochemistry including biosensors. 

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Ribulose phosphate is a ____________.

  1. Aldose sugar

  2. Ketose sugar

  3. Disaccharide

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

Ribulose phosphate is a 5-carbon sugar (pentose) containing a ketone group at the carbon-2 position. Therefore, it is classified as a ketose sugar, playing a key role in the pentose phosphate pathway and the Calvin cycle.

Multiple choice chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

Consider the following reagents
I. ${Br} _{2}$ water  II. Tollen's reagent
III. Fehling's solution which cannot be used to make distinction between an aldose and a ketose?

  1. I, II and III

  2. II and III

  3. I only

  4. II only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bromine water reacts with both aldoses and ketoses (though at different rates, it is not a specific test for distinction). Tollen's reagent and Fehling's solution are specific tests for aldehydes, which distinguish aldoses from ketoses.

Multiple choice chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

Equimolar mixture of a $\alpha-D(+)$- glucose and $\beta-D(+)$-glucose has specific rotation (${[\alpha]} _{D}$) is:

  1. $-{92.4}^{o}$
  2. $+{112.5}^{o}$
  3. $+{52.5}^{o}$
  4. $-{19.2}^{o}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The specific rotation of α-D-glucopyranose decreases from +112° to +52.5°.
The specific rotation of β-D-glucopyranose increases from +19° to +52.5°.
The specific rotation of equimolar mixture of  $\alpha$ - D(+) - glucose and $\beta$ - D(+) - glucose has a specific rotation $52.5^0$.

Hence, the correct option is C.
Multiple choice biochemical polymers polymerisation chemistry

Emperical formula of glucose is 

  1. ${C _6}{H _{12}}{O _6}$
  2. $\;{C _3}{H _6}{O _3}\;$
  3. $\;{C _2}{H _4}O\;\;\;\;$
  4. $C{H _2}O$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The empirical formula is the simplest whole-number ratio of atoms in a compound. For glucose (C6H12O6), the ratio of C:H:O is 1:2:1, resulting in CH2O.

Multiple choice biochemical polymers polymerisation chemistry

The sugar unit present in the nucleotides of RNA is :

  1. D - ribulose.

  2. L - ribose.

  3. D - ribose.

  4. L - ribulose.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

RNA (Ribonucleic acid) contains the sugar D-ribose, whereas DNA contains 2-deoxy-D-ribose.

Multiple choice bio-chemistry carbohydrate metabolism diabetes mellitus lifestyle diseases coordination in human beings- chemical control non-infectious diseases

For a person suffering from diabetes, the intake of carbohydrates should be preferably in the form of 

  1. Monosaccharide

  2. Disaccharide

  3. Polysaccharide

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

Carbohydrates should constitute around 60-70% of the total calories in diabetics. Carbohydrates in the form of simple sugars need restriction. The carbohydrates should be in the form of complex polysaccharides (starch) and contain adequate amount of digestible fibres. Very high carbohydrate intakes and/or high glycaemic index foods can exacerbate the dyslipidemia, including hypertriglyceridemia.

Therefore, the correct answer is option C.

Multiple choice bio-chemistry digestive system of human absorption mechanism absorption digestion

Which of the following chemical substance is absorbed by passive transport from the intestine?

  1. Glucose

  2. Galactose

  3. Amino acid

  4. Fructose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The chemical substance which is absorbed by the passive transport from the intestine is glucose, transported by SGLUT 1 and SGLUT 2
So, the correct answer is 'Glucose'