Class XI & XII · Biology practice
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408 questions in this collection · Page 36 of 41
Molecular Basis Of Inheritance
Which of the following enzymes synthesizes precursor mRNA?
A RNA polymerase I B RNA polymerase II C RNA polymerase III D DNA polymerase
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In eukaryotes, RNA polymerase II synthesizes heterogeneous nuclear RNA (hnRNA), the precursor of mRNA.
Biotechnology Principles And Processes
Given below are two statements:Statement I: Plasmids are autonomously replicating DNA.Statement II: Plasmids are extrachromosomal DNA.
A Both Statement I and Statement II are correct B Both Statement I and Statement II are incorrect C Statement I is correct but Statement II is incorrect D Statement I is incorrect but Statement II is correct
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Plasmids are small circular extrachromosomal DNA molecules that replicate independently of the bacterial chromosome.
Strategies For Enhancement In Food Production
Which of the following is used as an effective sedative and painkiller for treating post-surgery patients?
A Interferon B Antibiotics C Morphine D Anti-retroviral drugs
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Morphine, obtained from the opium poppy (Papaver somniferum), is an effective analgesic and sedative used for relieving severe pain after surgery.
Biotechnology Principles And Processes
Match List-I with List-II:
List-I List-II A. Transformation I. Restriction enzyme B. Cloning site II. Transfer DNA to host bacteria C. Selection III. Replication D. Ori IV. Antibiotic
A A-II, B-I, C-IV, D-III B A-I, B-II, C-IV, D-III C A-III, B-IV, C-II, D-I D A-IV, B-I, C-III, D-II
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Transformation transfers recombinant DNA into host bacteria. A cloning site contains restriction enzyme recognition sites. Antibiotic resistance genes are selectable markers, and ori is the origin of replication.
Biological Classification
Symbiotic association between fungi and algae are called ________.
A Lichens B Sponges C Mycorrhiza D Chrysophytes
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Lichens are symbiotic associations between algae (or cyanobacteria) and fungi.
Cell The Unit Of Life
Cell theory was formulated by ________.
A Schleiden and Schwann B Robert Brown C Singer and Nicolson D Antonie van Leeuwenhoek
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Matthias Schleiden and Theodor Schwann proposed the cell theory. Rudolf Virchow later modified it by stating that all cells arise from pre-existing cells.
Cell The Unit Of Life
Which of the following are characteristics of prokaryotic cells?
A (b) and (c) only B (a) and (c) only C (a), (c) and (d) only D (a), (b) and (c) only
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Prokaryotes possess 70S ribosomes (50S + 30S), plasmids and mesosomes, but they lack membrane-bound organelles such as peroxisomes.
Cell The Unit Of Life
Mitochondrial inner membrane encloses _________.
A Matrix B Cytosol C Mucus D Aqueous humor
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The inner mitochondrial membrane encloses the mitochondrial matrix, which contains enzymes of the Krebs cycle, mitochondrial DNA and ribosomes.
Cell The Unit Of Life
Match List-I with List-II:
List-I List-II A. Cristae I. Flat membrane sacs in stroma of chloroplast B. Cisternae II. Infoldings in mitochondria C. Thylakoids III. Cell membrane D. Phospholipid IV. Disc-shaped sacs in the Golgi apparatus
A A-III, B-IV, C-I, D-II B A-II, B-IV, C-I, D-III C A-II, B-IV, C-III, D-I D A-IV, B-III, C-I, D-II
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Cristae are infoldings of the inner mitochondrial membrane. Cisternae are flattened sacs of the Golgi apparatus. Thylakoids are membrane sacs in chloroplasts. Phospholipids are major components of cell membranes.
Cell The Unit Of Life
The plastid that stores xanthophyll is known as
A Chloroplast B Chromoplast C Aleuroplast D Amyloplast
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Chromoplasts contain carotenoid pigments such as carotene and xanthophyll, giving yellow, orange and red colours to plant parts.
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