CBSE Class 11 Cell: The Unit of Life — practice questions
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Practice CBSE Class 11 Cell: The Unit of Life in the app →A feature common to plant sieve-tube cells and mature mammalian RBCs isThe 'powerhouse of the cell' is theA feature common to prokaryotes and many eukaryotes (e.g. plants, fungi) isWhich organelle is the site of protein synthesis?According to the fluid-mosaic model, the cell membrane is composed mainly ofWhich is absent in a prokaryotic cell?Genetic material in a eukaryotic cell is primarily located in theThe cell theory was NOT proposed byWhich cell organelle contains hydrolytic enzymes for intracellular digestion?Plant cells differ from animal cells in havingThe endoplasmic reticulum studded with ribosomes is calledWhich of these is the largest among typical cells/structures?The statement *omnis cellula e cellula* ('every cell arises from a pre-existing cell') was contributed byThe defining structural feature that separates eukaryotic cells from prokaryotic cells isThe smallest known living cell isThe ribosomes of prokaryotic cells are designated asThe small circular DNA molecules found in bacteria, outside the main chromosome, are calledWhich of the following bacterial surface structures is primarily involved in motility?Mesosomes in prokaryotic cells help inThe fluid mosaic model of the cell membrane was proposed byActive transport across the plasma membraneWhich of the following is NOT considered part of the endomembrane system?Smooth endoplasmic reticulum is mainly the site ofThe inner membrane of a mitochondrion is folded intoMitochondria and chloroplasts share which of the following features with bacteria?The microtubule arrangement in the axoneme of eukaryotic cilia and flagella isInside a chloroplast, a stack of disc-shaped thylakoid sacs is called aWhich is NOT one of the three claims of cell theory?The smallest known cell per NCERT isAn example of an unusually large single cell visible to the naked eye isThe single feature that defines a eukaryote vs a prokaryote isIn prokaryotes, the inward folding of the plasma membrane that handles respiration, DNA replication and cell-wBacteria that retain the crystal-violet Gram stain and appear purple are classified asRough ER differs from smooth ER in thatMitochondria and chloroplasts share which key features?Lysosomes are produced by which organelle and contain what?Cilia and flagella share which internal microtubule arrangement?The nucleolus inside the nucleus is responsible forRibosome sizes areThe term 'cell' was coined in 1665 by:Prokaryotic cells DIFFER from eukaryotic cells in that prokaryotes:A structure UNIQUE to plant cells (NOT found in animal cells) is the:Mitochondria are called the 'POWERHOUSE OF THE CELL' because they:The Rough Endoplasmic Reticulum (RER) has its ribosomes attached to perform:Lysosomes are sometimes called the 'SUICIDE BAGS' of the cell because they:Chromoplasts in plants are responsible for:Eukaryotic ribosomes are typically:Cilia and flagella exhibit the characteristic '9 + 2' arrangement of:Who first saw and described a live cell?Who later discovered the nucleus?In 1838, which German botanist concluded that all plants are composed of different kinds of cells?According to Schwann, which structure is a unique character of plant cells?Who first explained that new cells are formed from pre-existing cells?What is the semi-fluid matrix that occupies the volume of a cell called?What do prokaryotic cells lack?Which non-membrane bound organelle of animal cells helps in cell division?Which are the smallest cells known?Which name describes a comma shaped bacterium?Small DNA molecules lying outside the genomic DNA of a bacterium are called what?Extensions of the plasma membrane into a prokaryotic cell form which structure?Prokaryotic ribosomes are built from which two subunits?Several ribosomes attached along a single mRNA form a chain called what?In prokaryotic cells, reserve material is stored in which form?Who proposed the fluid mosaic model of the cell membrane in 1972?The middle lamella between neighbouring plant cells is mainly made of what?Which structures connect the cytoplasm of neighbouring plant cells?Smooth endoplasmic reticulum is the major site for the synthesis of what?Who first observed the densely stained reticular structures near the nucleus that were later named after him?The first person to see and describe a living cell was:Who discovered the nucleus?Matthias Schleiden studied a large number of:Theodore Schwann studied different types of cells from:Schwann reported that cells had a thin outer layer now called the:Which structure did Schwann call unique to plant cells?Who first explained that new cells arise from pre-existing cells?In which year did Virchow give this explanation?Cells having a membrane bound nucleus are called:Cells that lack a membrane bound nucleus are called:Prokaryotic cells notably lack:Small circular DNA lying outside the genomic DNA of bacteria is a:Plasmid DNA commonly confers on bacteria a resistance to:Extensions of the plasma membrane into a bacterial cell form the:The prokaryotic ribosome is designated:The 70S prokaryotic ribosome is made of subunits:The eukaryotic ribosome is designated:The 80S eukaryotic ribosome is made of subunits:Ribosomes are the site of:Several ribosomes attached to a single mRNA form a:The fluid mosaic model was proposed by Singer and:The fluid mosaic model was proposed in the year: