Question No:1

The plasma membrane consists mainly of

(A) Phospholipids embedded in a protein bilayer
(B) Protein embedded in a phospholipid bilayer
(C) Proteins embedded in a polymer of glucose molecules
(D) Proteins embedded in a carbohydrate bilayer

Question No:2

Algae have cell wall made up of

(A) Cellulose, galactans and manans
(B) Hemicellulose, pectins and proteins
(C) Pectins, cellulose and proteins
(D) Cellulose, hemi cellulose, and pectins

Question No:3

Plasmodesmata are

(A) Locomotory structures
(B) Membranes connecting the nucleus with plasmalemma
(C) Connections between adjacent cells
(D) Lignified cemented layers between cells

Question No:4

Cytoskeleton is made up of

(A) Callose deposits
(B) Cellulosic microfibrils
(C) Proteinaceous filaments
(D) Calcium carbonate granules

Question No:5

Middle lamella is composed mainly of

(A) Muramic acid
(B) Calcium pectate
(C) Phosphoglycerides
(D) Hemicellulose

Question No:6

In germinating seeds fattyacids are degraded exclusively in the

(A) Proplastids
(B) Glyoxysomes
(C) Peroxisomes
(D) Mitochondria

Question No:7

Vacuole in plant cell

(A) Is membrane – bound and contain storage proteins and lipids
(B) Is membrane – bound and contains water and excretory substances
(C) Lacks membrane and contains air
(D) Lacks membrane and contains water and excretory substances

Question No:8

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

(A) Copper
(B) Manganese
(C) Magnesium
(D) Calcium

Question No:9

Keeping in view the ‘fluid mosaic model1 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)

(A) Both lipids and proteins can flip – flop
(B) While lipids can rarely flip – flop, proteins cannot
(C) While proteins can flip – flop, lipids cannot
(D) Neither lipids, nor proteins can flip -flop

Question No:10

The legnth of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

(A) Super – coiling in nucleosomes
(B) DNase – digestion
(C) Through elimination of repetitive DNA
(D) Deletion non – essential genes

Question No:11

Select wrong statement from following

(A) Both chloroplast and mitochondria have an internal compartment, the thylokoid space bounded by the thylokoid membrane
(B) Both chloroplast and mitochondria contain DNA
(C) The chloroplast are generally much larger than mitochondria
(D) Both chloroplast and mitochondria contain an inner and an outer membrane.

Question No:12

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

(A) Glycolipids
(B) Proline
(C) Phospholipids
(D) Cholesterol

Question No:13

The main organelle involved in modification and routing of newly synthesized proteins to their destinations is

(A) Mitochondria
(B) Endoplasmic reticulm
(C) Lysosome
(D) Chloroplast

Question No:14

Centromere is required for

(A) Transcription
(B) Crossing over
(C) Cytoplasmic cleavage
(D) Movement of chromosomes towards poles

Question No:15

Protein synthesis in an animal cell occurs

(A) Only on the ribosomes present in cytosol
(B) On ribosomes present in cytoplasm as well as in mitochondria
(C) Only on ribosomes attached to the nuclear envelope and endoplasmic reticulm
(D) On ribosomes present in the nucleolus as well as in cytoplasm.

Question No:16

According to widely accepted “fluid mosaic model” cell membranes are semi – fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statement is incorrect?

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

Question No:17

Flagella of prokaryotic and eukaryotic cells differ in (2004)

(A) Type of movement and placement in cell
(B) Location in cell and mode of functioning
(C) Microtubular organization and type of movement
(D) Microtubular organization and function

Question No:18

Extranuclear Inheritance is a consequence of presence of genes in

(A) Mitochondria and chloroplasts
(B) Endoplasmic reticulm and chloroplasts
(C) Ribosomes and chloroplast
(D) Lysosomes and ribosomes

Question No:19

In chloroplasts, chlorophyll is present in the

(A) Outermembrance
(B) Inner memebrance
(C) Thylokoids
(D) Stroma

Question No:20

If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?

(A) Metaphase
(B) Telophase
(C) Anaphase
(D) Prophase