Biology · Chemistry

Biomolecules and Enzymes

1,432 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 parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Semi-indispensible amino acids are

  1. Arginine and histidine

  2. Methionine and threonine

  3. Leucine and isoleucine

  4. Arginine and lysine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arginine and histidine are considered semi-essential (or semi-indispensable) amino acids because the body can synthesize them, but often not in sufficient quantities during growth or stress.

Multiple choice zoology excretion and osmoregulation micturition urine and urine formation urine formation

Separation of amino acid into amino and carboxyl group is known as

  1. Deamination

  2. Excretion

  3. Amination

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

Deamination is the process by which amino acids are broken down if there is an excess of protein intake. Deamination takes place in the liver. The amino group is removed from the amino acid and converted to ammonia. Ammonia is toxic to humans, so the enzymes convert it to urea or uric acid by addition of carbon dioxide molecules, which also takes place in the liver. Urea and uric acid is excreted in urine.

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Albumin is also known as _________.

  1. Perisperm

  2. Synergids

  3. Plumule

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

Perisperm is nutritive tissue outside embryosac. 
Synergid is supportive tissue. 
Plumule is involved  in the formation of shoot system. 
Endosperm is nutritive tissue and is also called albumin.
So, the correct option 'Endosperm'.

Multiple choice evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

The primary threshold substance are............... .

  1. Urea and uric acid

  2. Potassium and calcium

  3. Glucose and amino acids

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

A substance present in blood is filtered through kidneys. Depending on the concentration they are divided as follows, High threshold substances(such as chlorides or glucose), Low threshold substances (such as phosphates or urea). No-threshold substances (such as creatinine sulfate). The primary threshold substance is Urea and uric acid.

So the correct option is 'Urea and uric acid.'

Multiple choice evs food and health effect on general health diseases caused by changes in lifestyle diet, drugs and disease

The bond that links amino acid to form a protein is known as 

  1. Phosphate bond

  2. Hydrogen bond

  3. Covalent bond

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

The linking of two amino acids is accompanied by the loss of a molecule of water. A series of amino acids joined by peptide bonds form a polypeptide chain, and each amino acid unit in a polypeptide is called a residue.

So, the correct option is 'Peptide bond'.

Multiple choice evs food and health effect on general health diseases caused by changes in lifestyle diet, drugs and disease

An example of conjugated protein is

  1. Albumin

  2. Globulin

  3. Heamoglobin

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  1. A conjugated protein is a protein that functions in interaction with other (non-polypeptide) chemical groups attached by covalent bonding or weak interactions. Some examples of conjugated proteins are lipoproteins, glycoproteins, metalloproteins etc.
  2.  Haemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells of almost all vertebrates as well as the tissues of some invertebrates. 
  3. Haemoglobin contains the prosthetic group known as heme. Each heme group contains an iron ion ($Fe^{2+}$) which forms a coordinate bond with an oxygen molecule ($O _2$), allowing haemoglobin to transport oxygen through the bloodstream. As each of the four protein subunits of haemoglobin possesses its own prosthetic heme group, each haemoglobin can transport four molecules of oxygen. Hence, the example of the conjugated protein is haemoglobin.
So, the correct answer is 'haemoglobin'.

Multiple choice evs food and health effect on general health diseases caused by changes in lifestyle diet, drugs and disease

Heamoglobin is an example of simple proteins.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(a) Simple proteins:-  On hydrolysis they yield only the amino acids and occasional small carbohydrate compounds. Examples are: albumins, globulins, glutelins, albuminoids, histones and protamines.

(b) Conjugated proteins:- These are simple proteins combined with some non-protein material in the body. Examples are: nucleoproteins, glycoproteins, phosphoproteins, haemoglobins and lecithoproteins.
So, the correct option is 'False'.

Multiple choice biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

Which biomolecule is made up of only carbon, hydrogen and oxygen?

  1. Lipids

  2. Proteins

  3. Carbohydrates

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

Proteins are the polymers of amino acids and have C, H, O, N and S. Carbohydrates and  nucleic acids have C, H, O, N, P and S. Lipids are chemically diverse group and mostly have long hydrocarbon chain composed of C, H and O. Thus, the correct answer is A.