The solid linear cytoskeletal elements having a diameter of 6nm and made up of a single

type of monomer are known as

  • microtubules

  • microfilaments

  • intermediate filaments

  • lamins

The osmotic expansion of a cell kept in water is chiefly regulated by

  • mitochondria

  • vacuoles

  • plastids

  • ribosomes

A major site for synthesis of lipids is

  • RER

  • SER

  • symplast

  • nucleoplasm

The Golgi complex plays a major role

  • in trapping the light and tranforming it into chemical energy

  • in digesting proteins and carbohydrates

  • as energy transferring organelles

  • in post translational modificaiton of proteins and glycosidation of lipids

Ribosomal RNA is actively synthesized in

  • lysosomes

  • nucleolus

  • nucleoplasm

  • ribosomes

What is true about ribosomes?

 

  • The prokaryotic ribosomes are 80 S, where S stands for sedimentation coefficient

  • These are composed of ribonucleic acid and proteins

  • These are found only in eukaryotic cells

  • These are self-splicing introns of some RNAs

Select the correct statement from the following regarding cell membrane.

  • Na+ and K ions move across cell membrane by passive transport

  • Proteins make up 60 to 70% of the cell membrane

  • Lipids are arranged in a bilayer with polar heads towards the inner part

  • Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Important site for formation of glycoproteins and glycolipids is

  • Golgi apparatus

  • plastid

  • Lysosome

  • vacuole

Which one of the following also act as a ribozyme in a bacterial cell?

  • snRNA

  • hn RNA

  • 23 S rRNA

  • 5 S rRNA

In eubacteria, a cellular component that resembles eukaryotic cells is

  • ribosomes

  • cell wall

  • plasma membrane

  • nucleus

Peptide synthesis inside a cell takes place in

  • mitochondria

  • chromoplast

  • ribosomes

  • chloroplast

Which one of the following structures between two adjacent cells is an effective transport

pathway?

  • Plasmodesmata

  • Plastoquinones

  • Endoplasmic rcticulum

  • Plasmalemma

Which one of the following has its own DNA?

  • Mitochondria

  • Dictyosome

  • Lysosome

  • Peroxisome

The main arena of various types of activities of a cell is

  • plasma membrane

  • mitochondrion

  • cytoplasm

  • nucleus

The plasma membrane consists mainly of

  • phospholipids embedded in a protein bilayer

  • proteins embedded in a phospholipid bilayer

  • proteins embedded in a polymer of glucose molecules

  • proteins embedded in a carbohydrate bilayer

Middle lamella is mainly composed of

  • hemicellulose

  • muramic acid

  • calcium pectate

  • phosphoglycerides

Plasmodesmata are

  • lignified cemented layers between cells

  • locomotory structures

  • membranes connecting the nucleus with plasmalemma

  • connections between adjacent cells

Cytoskeleton is made up of

  • calcium carbonate granules

  • callose deposits

  • cellulosic microfibrils

  • proteinaceous filaments

Keeping in view the 'fluid mosaic model for the structure of cell membrane, which one of

the following statements is correct with respect to the movement of lipids and proteins

from one lipid monolayer to the other (described as flip-flop movement)?

  • Both lipids and proteins can flip-flop

  • While lipids can rarely flip-flop, proteins cannot

  • While proteins can flip-flop, lipids cannot

  • Neither lipids, nor proteins can flip-flop

Polysome is formed by

  • several ribosomes attached to a single mRNA

  • many ribosomes attached to a strand of endoplasmic reticulum

  • a ribosome with several subunits 

  • ribosomes attached to each other in a linear arrangement

The two subunits of ribosome remain united at a critical ion level of

  • copper

  • manganese

  • magnesium

  • calcium

Vacuole in a plant cell

  • is membrane-bound and contains storage proteins and lipids

  • is membrane-bound and contains water and excretory substances

  • lacks membrane and contains air

  • lacks membrane and contains water and excretory substances

In germinating seeds fatty acids are degraded exclusively in the

  • proplastids

  • glyoxysomes

  • peroxisomes

  • mitochondria

Which one of the following is not a constituent of cell membrane ?

  • Cholesterol

  • Glycolipids

  • Proline

  • Phospholipids

Lysozyme that is present in perspiration, saliva and tears, destroys:

  • certain fungi

  • certain types of bacteria

  • all viruses

  • most virus-infected cells

Select the wrong statement from the following:

space bounded by the thylakoid membrane

  • both chloroplasts and mitochondria contain an inner and an outer membrane

  • both chloroplasts and mitochondria have an internal compartment, the thylakoid

  • both chloroplasts and mitochondria contain DNA

  • the chloroplasts are generally much larger than mitochondria

Which of the following statements regarding mitochondrial membrane is not correct?

  • The outer membrane is permeable to all kinds of molecules

  • The enzymes of the electron transfer chain are embedded in the outer membrane

  • The inner membrane is highly convoluted forming a series of infoldings

  • The outer membrane resembles a sieve

Which of the following statements regarding cilia is not correct ?

microtubules

  • The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane

  • Cilia are hair-like cellular appendages

  • Microtubules of cilia are composed of tubulin

  • Cilia contain an outer ring of nine doublet microtubules surrounding two single

The organelle common among prokaryotic and eukaryotic cell is

  • centrosome

  • ribosome

  • peroxisome

  • glyoxysome

Which one of the following phenomena is commonly referred as 'cell drinking?

  • Endocytosis

  • Exocytosis

  • Phagocytosis

  • Pinocytosis

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