Free Cell Structure and Function MCQs with Answers

• A. Proteins can also undergo flip-flop movements in the lipid bilayer
• B. Many proteins remain completely embedded within the lipid bilayer
• C. Proteins in cell membranes can travel within the lipid bilayer
• D. Proteins can remain confined within certain domains of the membranes

Explanation: The incorrect statement is A. In the fluid mosaic model, proteins are generally considered to be too large to undergo spontaneous…

• A. Chloroplast
• B. Mitochondria
• C. Lysosome
• D. Endoplasmic reticulum.

Explanation: The proteins formed on ribosomes pass into the ER lumen where they are modified.

• A. Only gymnosperm cells
• B. All plant cells
• C. All eukaryotic cells
• D. Only bacterial cells

Explanation: Totipotency is the ability of a living somatic plant cell to develop into a complete plant. It was first demonstrated by Steward et.

• A. Nucleolus
• B. Cytoplasm
• C. Mitochondria
• D. Golgi body.

Explanation: Nucleolus synthesizes and stores RNA. The ribosomal proteins are synthesized in the cytoplasm and shift to the nucleolus for the formation…

• A. Ca
• B. Zn
• C. K
• D. Cu.

Explanation: The middle lamella is the first formed layer present between two adjacent cells.

• A. Phytochrome
• B. Chlorophyll
• C. Anthocyanin
• D. Carotenoids

Explanation: Phytochrome is a plant pigment that can detect the presence or absence of light and is involved in regulating many processes that are…

• A. Mitochondria
• B. Spherosomes
• C. Nucleus
• D. Cell wall

Explanation: The spherosomes are spherical bodies, about 0.5­-1um wide and enclosed by a single unit membrane.

• A. Centrioles
• B. Spindle fibres
• C. Cell plates
• D. Centromeres

Explanation: The centrioles occur in nearly all animal cells and in motile plant cells, such as zoospores of algae, sperm cells of ferns, and motile…

• A. Helically arranged protein molecules
• B. "9 + 2" membrane enclosed structure
• C. Unit membrane enclosed fibre
• D. Protein membrane enclosed fibre

Explanation: Prokaryotic flagellum is not surrounded by any membrane. It consists of a single thread.

• A. Cell division
• B. Cell adherence
• C. Cytolysis
• D. Cellular excretion

Explanation: In desmosomes, circular patches of cell membranes are held together by interaction of proteins that extend through each membrane into the…

• A. Ribosomes
• B. Polysomes
• C. Plastids
• D. Lysosomes

Explanation: A lysosome is a tiny sac bounded by a single unit membrane of lipoprotein. It contains a dense, finely granular fluid.

• A. Protein synthesis
• B. Phosphorylation of flavoproteins
• C. Breakdown of macromolecules
• D. Oxidation-­reduction reactions.

Explanation: Respiratory chain is located in the inner membrane (cristae) of mitochondria.

• A. Nucleolus
• B. Mitochondrion
• C. Centriole
• D. Golgi apparatus

Explanation: Golgi apparatus is a stack of parallel, flattened, intercommunicating sacs or cisternae and many peripheral tubules and vesicles.

• A. Endoplasmic reticulum
• B. Nucleosome
• C. Lysosome
• D. Phagosome

Explanation: A lysosome is a tiny sac bounded by a single unit membrane of lipoprotein. It contains a dense, finely granular fluid.

• A. Higher plants
• B. Yeast
• C. Bacteria and blue­green algae
• D. None

Explanation: Golgi apparatus is absent in bacteria and blue green algae. Golgi bodies are absent in prokaryotic cells and present in eukaryotic cells…

• A. Proteins
• B. Lipids
• C. Proteins and lipids
• D. Glycoproteins and glycolipids

Explanation: Cell recognition and adhesion occur due to biochemicals of cell membranes named glycoproteins and glycolipids.

• A. Absent
• B. Occasional
• C. Formed between non homologous chromosomes
• D. Formed between homologous chromosomes

Explanation: In salivary gland chromosomes/polytene chromosomes pairing is formed between homologous chromosomes.

• A. Modified cell theory means that all living beings are composed of cells capable of reproducing.
• B. Cell theory does not hold good because all living beings (e.g. viruses) do not have cellular organisation.
• C. Cell theory means that all living objects consists of cells whether or not they are capable of reproducing.

Explanation: This statement is partly correct regarding viruses as an exception to cell theory due to their acellular nature.

• A. Protoplasm as the physical basis of life
• B. Cell theory
• C. Theory of cell lineage
• D. Nucleus functions as control centre of cell.

Explanation: Factual Recall. Names of Schleiden and Schwann became associated with cell theory in 1839.

• A. Ultra centrifugation
• B. Electron microscope
• C. Light microscope
• D. X­-rays crystallography

Explanation: X­-rays crystallography is a technique which is used to study the binding of proteins on regulatory DNA sequences.