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
-
Only 1
-
Only 1 and 2
-
Only 3 and 4
-
Only 4
-
All of these
D
Correct answer
Explanation
Eastern blot is a technique to detect protein post translational modification and is an extension of the biochemical technique of western blotting.
-
Storage
-
Transporting
-
Enzymatic
-
Protective
-
NA
D
Correct answer
Explanation
It is the correct answer as thrombin comes under the protective category of proteins.
-
L-valine
-
L-cysteine
-
L-methionine
-
L-isoleucine
B
Correct answer
Explanation
During the biosynthesis of penicillin, L-cysteine is added first to alpha-aminoadipic acid to obtain alpha-aminoadipic acid- L-cysteine complex, which in 3 stages yield beta-lactam ring.
-
Biotin
-
Cobalt
-
5,6-dimethyl Benzimidazole
-
Betaine
D
Correct answer
Explanation
The yield of vitamin B12 increases when the medium is supplemented with betaine. The usual source of betaine is sugar beet molasses.
-
agar agar
-
spirulina
-
rhizobium
-
acetobacter
-
salmonella
B
Correct answer
Explanation
Spirulina is a classic example of Single Cell Protein (SCP) - a protein-rich biomass produced from microorganisms (cyanobacteria in this case) used as food or feed. It contains 60-70% protein and is cultivated for its nutritional value. Agar-agar is a polysaccharide from algae, while Rhizobium, Acetobacter, and Salmonella are bacteria not typically produced or used as SCP sources.
-
Glutaryl-coenzyme A
-
Glutaconyl-CoA
-
Crotonyl-coenzyme A
-
Isobutyryl-coenzyme A
-
Methacrylyl-CoA
E
Correct answer
Explanation
Methacrylyl-CoA is an intermediate in the metabolism of valine.
-
Asparagines
-
Cystine
-
Glutamine
-
Glycine
-
Cysteine
D
Correct answer
Explanation
It acts as a neurotransmitter and plays a vital role in healing wounds.
-
Phosphoproteins
-
Glycoproteins
-
Lipoproteins
-
Chromoproteins
-
Nucleoproteins
B
Correct answer
Explanation
These proteins contain carbohydrates as the prosthetic group.
-
Saccharopine
-
Allysine
-
α-Aminoadipic acid
-
α-Ketoadipic acid
-
Isovaleryl-coenzyme A
A
Correct answer
Explanation
Saccharopine is an intermediate in the metabolism of amino acid lysine.
-
Alcohol is a primary metabolite.
-
The metabolome forms a large network of metabolic reactions.
-
The rate of degradation of a metabolite is an important determinant of the duration and intensity of its action.
-
Some antibiotics use sceondary metabolites as precursors.
-
A secondary metabolite has an important ecological function.
D
Correct answer
Explanation
Some antibiotics use primary metabolites as precursors.
-
aldolase
-
triose phosphate isomerase
-
trypsin
-
cellulase
-
alliinase
E
Correct answer
Explanation
Alliinase is responsible for catalysing chemical reactions that produce the volatile chemicals that give odours and tear-inducing properties.
-
Corncokles
-
Archea
-
Solomon's seals
-
Soybeans
B
Correct answer
Explanation
Pyrrolysine is an ɑ-amino acid that is used in the biosynthesis of proteins in some methanogenic archaea and bacteria.
-
Primary
-
Secondary
-
Tertiary
-
Quaternary
C
Correct answer
Explanation
Myoglobin has tertiary structure.
-
Salmon sperm
-
Corn
-
Corncokle
-
Solomon's seal
C
Correct answer
Explanation
In seeds of corncokle, the amino acid orcylalanine is found. It is considered to be a substituted phenylalanine.
-
Rearrangement of the amino acid sequence takes place.
-
The 3D shape of the enzyme is disrupted.
-
Peptide bonds break and amino acids are formed.
-
New peptide bonds are formed.
B
Correct answer
Explanation
The enzyme loses its function on denaturation because the 3D shape of the enzyme is disrupted. Due to disruption of shape, the active site is no more available.