Biology · Chemistry

Biomolecules and Enzymes

1,501 Questions

This topic focuses on biomolecules, specifically proteins, enzymes, and amino acids. It includes questions on enzyme structures, protein folding, and catalysis. These concepts are crucial for medical and biology competitive exams.

Enzyme catalysisProtein structuresAmino acid synthesisPolypeptide chainsBiomolecule properties

Biomolecules and Enzymes Questions

Multiple choice biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

Assume a spherical mammalian cell has diameter of 27 $\mu m$, If a polypeptide chain with alpha helical canfoemation has to stretch across the cell, how many amino acids should it comprise of: 

  1. 18000

  2. 27000

  3. 1800

  4. 12000
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

No. of amino acid in one term in α helix = 3.6

Pitch length for α Helix = 5.4 Aº  
The No. of Amino acid in polypeptide
= 1.8 x $10^4$ Amino acid = 18000 amino acid
Thus A is the correct answer.

Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Components, present in acid insoluble pool are?

  1. Protein, nucleic acid, polysaccharide

  2. Protein, lipid, monosaccharide

  3. Protein, nucleic acid, amino acid

  4. Lipid, amino acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The acid-insoluble pool (retentate) in biochemical analysis contains macromolecules like proteins, nucleic acids, and polysaccharides, which are too large to pass through the filter.

Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Major requirement of protein in the body is for

  1. Energy

  2. Growth

  3. Repair

  4. Proper nourishment
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation
The major requirement of protein in the body is for growth and repair.
Protein is a nutrient needed by the human body for growth and maintenance. Aside from water, proteins are the most abundant kind of molecules in the body. Protein can be found in all cells of the body and is the major structural component of all cells in the body, especially muscle. This also includes body organs, hair and skin. Proteins are also used in membranes, such as glycoproteins. When broken down into amino acids, they are used as precursors to nucleic acid, coenzymes, hormones, immune response, cellular repair, and other molecules essential for life. Additionally, protein is needed to form blood cells.
Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Which of the following is biomolecule but not true polymer?

  1. Lipid

  2. cellulose

  3. Nucleic acids

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

Lipid is not a true polymer as it contains a distinct functional group at one end in addition to repeated units of Hydrocarbons. So, the growth of the polymer takes place only in one direction, which does not  occur in case of polymers. 

So, the correct answer is 'Lipid'
                                                                                                                   

Multiple choice biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

Which of the following is incorrectly matched?

  1. $Protein \rightarrow$ Degraded by Proteases
  2. Fats $\rightarrow$ Fatty acid + Glycerol
  3. Kreb's cycle $\rightarrow$ Carboxylation
  4. Respiration Pathway $\rightarrow$ Amphibolic Pathway
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Kreb's cycle involves decarboxylation and oxidation steps rather than carboxylation. Proteins are degraded by proteases, fats break down to fatty acids and glycerol, and respiration is widely recognized as an amphibolic pathway.

Multiple choice urea organic compounds with functional group containing nitrogen

Wohler's synthesis is used for the preparation of :

  1. Glycine

  2. Amino acids

  3. Urea

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

Wohler's synthesis is used for the preparation of urea. In this reaction ammonium cyanate is transformed into urea.
$\displaystyle NH _4(NCO) \rightarrow NH _3 + HNCO \rightarrow (NH _2) _2CO$

Multiple choice chemistry atomic theory, periodic classification and properties of elements introduction to periodic table necessity of classification need for classification

A biological catalyst is

  1. $N _2$ molecules

  2. an enzyme

  3. an amino acid<span class="MathJax MathJax_Processing">

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

Biological catalysts are proteins known as enzymes, which speed up biochemical reactions in living organisms. Amino acids are the building blocks of enzymes, but the enzyme itself is the catalyst.

Multiple choice chemistry atomic theory, periodic classification and properties of elements introduction to periodic table necessity of classification need for classification

Hydrolysis of urea is an example of

  1. Homogenious reaction

  2. heterogenious reaction

  3. Biomolecular reaction

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

Enzymes are biological catalysts which catalyze the biochemical reactions in living organisms.

Hydrolysis of urea by urease is an example of  biochemical catalysis.

 

Multiple choice evs - i constituents of food dietary sources of proteins types of nutrients calorific value of nutrients

Signaling between cells usually results in the activation of protein

  1. Lipases

  2. Kinases

  3. Proteases

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

One of the important mechanisms of cell communication is through reversible phosphorylation and dephosphorylation of proteins. These reactions are catalysed by kinases and occur through a cascade mechanism.

Multiple choice evs - i constituents of food dietary sources of proteins types of nutrients calorific value of nutrients

Most abundant protein in the human body is

  1. Haemoglobin

  2. Keratin

  3. Collagen

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

Collagen is the most abundant protein in the animal world which accounts for 30% of total protein content in the human body. Collagen is a key constituent of all the connective tissues. It is found in joints, bones, skin, hair, etc. This protein helps the skin to move, stretch and rebound into shape. It is present throughout the body and keeps the cells together. Without collagen the body would fall apart into pieces. 

Thus, the correct answer is option C.

Multiple choice evs - i constituents of food dietary sources of proteins types of nutrients calorific value of nutrients

The protein encoded by cry | Ab controls:

  1. Tobacco Budworm

  2. Corn Borer

  3. Bollworm

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

The Bt toxin is encoded by a gene named cry. The protein encode by cry IAb control corn borers.The protein encoded by the genes cry I Ac and cry II Ab control the cotton boll worms.

  • Thus, the correct answer is 'Corn Borer'.