Practice ordinary MCQs and grouped Question Sets together in one continuous session.
Practice Questions
One question at a time with instant answer view.
Question 1 of 5
Q1MatchMarks: 4.00Negative: -1.00
Name of gene is in column 'A' and encodes in column 'B'. Choose the correct match:
A
B
1.
Gene 'i'
A.
Permease
2.
Gene 'z'
B.
Repressor
3.
Gene 'y'
C.
Transacetylase
4.
Gene 'a'
D.
\(\beta\)-galactosidase
Correct Answer: C
This question is based on the Lac Operon model proposed by Jacob and Monod, explaining gene regulation in E. coli.
Correct Matching
Gene: Encodes (Function)
i: Repressor protein (Binds the operator and blocks transcription in the absence of lactose)
z: β-Galactosidase (Breaks lactose into glucose and galactose)
y: Permease (Facilitates the entry of lactose into the bacterial cell)
a: Transacetylase (Transfers acetyl groups; its exact physiological role is less significant in lactose metabolism)
Q2SingleMarks: 4.00Negative: -1.00
Antibody molecule has:
Correct Answer: C
An antibody (immunoglobulin) molecule is a Y-shaped protein consisting of four polypeptide chains:
Two Light (L) Chains: These are the shorter peptide strands.
Two Heavy (H) Chains: These are the longer peptide strands.
Q3SingleMarks: 4.00Negative: -1.00
Which one of the following is opposite part of micropylar end of ovule?
Correct Answer: B
Q4MatchMarks: 4.00Negative: -1.00
Match column A with column B and choose correct answer:
A
B
1.
Citric Acid
A.
Trichoderma polysporum
2.
Ethanol
B.
Monascus purpureus
3.
Statins
C.
Saccharomyces cerevisiae
4.
Cyclosporin A
D.
Aspergillus niger
Correct Answer: A
This question is based on NCERT Class 12 Biology – Chapter: Microbes in Human Welfare.
A. Citric Acid → Aspergillus niger
Aspergillus niger is a fungus used commercially to produce citric acid, an important organic acid used in the food and pharmaceutical industries.
B. Ethanol → Saccharomyces cerevisiae
Saccharomyces cerevisiae, commonly known as baker's yeast, ferments sugars to produce ethanol and carbon dioxide.
It is widely used in brewing and baking industries.
C. Statins → Monascus purpureus
Monascus purpureus produces statins, which inhibit the enzyme HMG-CoA reductase.
Statins are used to lower blood cholesterol levels.
D. Cyclosporin A → Trichoderma polysporum
Trichoderma polysporum produces Cyclosporin A, an immunosuppressive drug.
It is commonly used to prevent organ transplant rejection.
Q5SingleMarks: 4.00Negative: -1.00
EcoRI, a significant tool in rDNA technology is –
Correct Answer: C
EcoRI is a restriction endonuclease (restriction enzyme) widely used in recombinant DNA (rDNA) technology.
It recognizes a specific palindromic DNA sequence:
5′GAATTC3′
and cuts the DNA between G and A, producing sticky ends that facilitate the insertion of foreign DNA into vectors.
Recognition and Cleavage Site
5'— G↓AATTC — 3'
3'— CTTAA↑G — 5'
The sticky ends produced by EcoRI are essential for forming recombinant DNA molecules.
Therefore, EcoRI is an enzyme, making Option 3 the correct answer.
You have completed 5 guest practice questions.
Create a free student account to practise up to 20 questions.
