Chapter 8 – Cell: The Unit Of Life

A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is

• a.Absence of mitochondria
• b.Presence of cell wall
• c.Presence of haemoglobin
• d.Absence of nucleus

Select one which is not true for ribosome

• a.Made of two sub-units
• b.Form polysome
• c.May attach to m+RNA
• d.Have no role in protien synthesis

Which one of these is not a eukaryote?

• a.Euglena
• b.Anabena
• c.Spirogyra
• d.Agaricus

Which of the following stains is not used for staining chromosomes?

• a.Basic Fuchsin
• b.Safranin
• c.Methylene green
• d.Carmine

Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings i. Mycoplasma ii. Ostrich eggs UNIT ELL : THE NITIII: III: UNIT SCTRUCTURE ELL : SOF LIFEFUNCTIONS TRUCTURE AND FUNCTIONS 39 iii. Human RBC iv. Bacteria Options:

• a.i, iv, iii & ii
• b.i, iii, iv & ii
• c.ii, i, iii & iv
• d.iii, ii, i & iv

Which of the following features is common to prokaryotes and many eukaryotes?

• a.Chromatin material
• b.Cell wall present
• c.Nuclear membrane present
• d.Membranes bound sub-cellular organelles present

Who proposed the fluid mosaic model of plasma membrane?

• a.Benda
• b.Schleiden and Schwann
• c.Singer and Nicolson
• d.Robert Brown

Which of the following statements is true for a secretory cell?

• a.Golgi apparatus is absent
• b.Rough Endoplasmic Reticulum (RER) is easily observed in the cell
• c.Only Smooth Endoplasmic Reticulum (SER) is present
• d.Secretory granules are formed in nucleus.

What is a tonoplast?

• a.Outer membrane of mitochondria
• b.Inner membrane of chloroplast
• c.Membrane boundary of the vacuole of plant cells
• d.Cell membrane of a plant cell

Which of the following is not true of a eukaryotic cell?

• a.Cell wall is made up of peptidoglycans
• b.80S type of ribosomes are present in the cytoplasm
• c.Mitochondria contain circular DNA
• d.Membrane bound organelles are present

Which of the following statements is not true for plasma membrane?

• a.It is present in both plant and animal cell
• b.Lipid is present as a bilayer in it
• c.Proteins are present integrated as well as loosely associated with the lipid bilayer
• d.Carbohydrate is never found in it

Plastid differs from mitochondria on the basis of one of the following features. Mark the right answer.

• a.Presence of two layers of membrane
• b.Presence of ribosome
• c.Presence of thylakoids
• d.Presence of DNA

Which of the following is not a function of cytoskeleton in a cell?

• a.Intracellular transport
• b.Maintenance of cell shape and structure
• c.Support of the organelle
• d.Cell motility

The stain used to visualise motochondria is

• a.Fast green
• b.Safranin
• c.Acetocarmine
• d.Janus green