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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 3151. |
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 statements is incorrect [CBSE PMT 2005] |
| A. | Proteins in cell membranes can travel with in the lipid bilayer |
| B. | Proteins can also undergo flip-flap movements in the lipid bilayer |
| C. | Proteins can remain confined within certain domains of the membrane |
| D. | Many proteins remain completely embedded within the lipid bilayer |
| Answer» C. Proteins can remain confined within certain domains of the membrane | |
| 3152. |
Plasma membrane helps in [J&K CET 2005] |
| A. | Transportation of only water in and out of cell |
| B. | Protein sythesis |
| C. | Osmoregulation |
| D. | Nucleic acid synthesis |
| Answer» D. Nucleic acid synthesis | |
| 3153. |
The non-membranous organelles are [DPMT 2004] |
| A. | Centrioles |
| B. | Ribosomes |
| C. | Nucleolus |
| D. | All of these |
| Answer» E. | |
| 3154. |
Single membrane bound organelles are [DPMT 2004] |
| A. | Lysosome |
| B. | Sphaerosome |
| C. | Glyoxysome |
| D. | All of these |
| Answer» E. | |
| 3155. |
Desmosome is modification of [MP PMT 2004] |
| A. | Plasma membrane |
| B. | Nucleous |
| C. | Golgi bodies |
| D. | ER-Nucleus complex |
| Answer» B. Nucleous | |
| 3156. |
Carbohydrates are present in the plasmalemma in the form of [BHU 1986, 91] |
| A. | Starch |
| B. | Cellulose |
| C. | Hemicellulose |
| D. | Phospholipids (glycolipids) and phosphoproteins (glycoproteins) |
| Answer» E. | |
| 3157. |
Pinocytosis and phagocytosis are concerned with |
| A. | Cell wall |
| B. | Protoplasm |
| C. | Nucleus |
| D. | None of these |
| Answer» C. Nucleus | |
| 3158. |
In Danielli and Davson's model polar end is represented by |
| A. | Circular |
| B. | Rod |
| C. | Thread |
| D. | Ribbon |
| Answer» B. Rod | |
| 3159. |
Active transport is affected by |
| A. | Cold |
| B. | Cynide |
| C. | Absence of\[{{O}_{2}}\] |
| D. | All of these |
| Answer» E. | |
| 3160. |
Biological membranes are composed of |
| A. | 40% proteins and 60% lipids |
| B. | 50% proteins and 50% lipids |
| C. | 70% proteins and 30% lipids |
| D. | 60% proteins and 40% lipids |
| Answer» E. | |
| 3161. |
Pinocytosis and phagocytosis are absent in |
| A. | Prokaryotic cells |
| B. | Eukaryotic animal cells |
| C. | Eukaryotic plant cells |
| D. | None of the above |
| Answer» B. Eukaryotic animal cells | |
| 3162. |
Which of the following constituent of biological membrane [CPMT 1987; MP PMT 2002, 03; AIEEE 2004] |
| A. | Phosphoprotein |
| B. | Protein and Phospholipid |
| C. | Phospholipids |
| D. | Cellulose |
| Answer» C. Phospholipids | |
| 3163. |
Beet root if kept in cold water anthocyanin does not come out due to plasma membrane [BHU 2003] |
| A. | Differentially permeable |
| B. | Impermeable to anthocyanins |
| C. | Permeable to anthocyanins |
| D. | Dead |
| Answer» C. Permeable to anthocyanins | |
| 3164. |
Who proposed "fluid mosaic model" for plasma membrane [RPMT 1999; BHU 2000, 01; Orissa JEE 2004; Pb. PMT 2004] |
| A. | C. Cramer and C. Naegeli |
| B. | Singer and Nicholson |
| C. | Denielli and Davson |
| D. | J. D. Robertson |
| Answer» C. Denielli and Davson | |
| 3165. |
Thickness of plasma membrane is [MP PMT 2003] |
| A. | \[\text{10}\overset{\text{o}}{\mathop{\text{A}}}\,\,\,\text{to}\,\,\text{30}\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| B. | \[\text{30}\overset{\text{o}}{\mathop{\text{A}}}\,\,\,\text{to}\,\,\text{50}\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| C. | \[\text{50}\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\,\,\text{to}\,\,\text{70}\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| D. | \[\text{70}\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\,\,\text{to}\,\,\text{100}\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| Answer» E. | |
| 3166. |
Membrane proteins are held in the bilayer mainly by |
| A. | Hydrophobic attraction |
| B. | Hydrophilic attraction |
| C. | Covalent bonds |
| D. | Ionic bonds |
| Answer» B. Hydrophilic attraction | |
| 3167. |
Unit membrane is made of [DPMT 1992] |
| A. | Lipoproteins |
| B. | Cellulose |
| C. | Phospholipids |
| D. | Phosphoproteins |
| Answer» B. Cellulose | |
| 3168. |
Cell membrane carbohydrates participate in |
| A. | Transporting substances across the membrane |
| B. | Cell to cell recognization |
| C. | Attaching the membrane to cytoskeleton |
| D. | Cell adhesion |
| Answer» C. Attaching the membrane to cytoskeleton | |
| 3169. |
Kavanau's lipid pillar model cannot explain |
| A. | Passive transport |
| B. | Active transport |
| C. | Phagocytosis |
| D. | None of these |
| Answer» C. Phagocytosis | |
| 3170. |
Desmosomes or Tonofibrils are |
| A. | Small particles |
| B. | Another name of golgi complex |
| C. | Formed in cytoplasm by the union of plasma membrane |
| D. | Ribosomes |
| Answer» D. Ribosomes | |
| 3171. |
Singer and Nicholson's model of plasma membrane differs from Robertson's model in the [AIIMS 1984] |
| A. | Number of lipid layers |
| B. | Arrangement of lipid layers |
| C. | Arrangement of proteins |
| D. | Absence of protein in Singer and Nicholson's model |
| Answer» D. Absence of protein in Singer and Nicholson's model | |
| 3172. |
Which pair of structures are usually found in both plant and animal cells |
| A. | Cell membrane and nucleolus |
| B. | Cell membrane and cell wall |
| C. | Nucleolus and chloroplast |
| D. | Nucleus and cell wall |
| Answer» B. Cell membrane and cell wall | |
| 3173. |
According to mosaic model, plasma membrane is made up of [CBSE PMT 1988; DPMT 1982] |
| A. | Cellulose and hemicellulose |
| B. | Phospholipid and integrate protein |
| C. | Phospholipid, extrinsic and intrinsic protein |
| D. | Phospholipid and hemicellulose |
| Answer» D. Phospholipid and hemicellulose | |
| 3174. |
One of the fundamental characteristic of cell membrane is [DPMT 1993] |
| A. | Amino acid regulation |
| B. | Fat regulation |
| C. | Glucose regulation |
| D. | Ion regulation |
| Answer» E. | |
| 3175. |
Which one statement regarding plasma membrane is correct |
| A. | Its outer and inner layer are electron dense while middle layer is electron transparent |
| B. | Its outer and middle layer are electron transparent while inner layer is electron dense |
| C. | Its outer and inner layer are electron transparent while middle one is electron dense |
| D. | All layers are electron dense |
| Answer» B. Its outer and middle layer are electron transparent while inner layer is electron dense | |
| 3176. |
The process of cell eating is called [KCET 2000] |
| A. | Pinocytosis |
| B. | Phagocytosis |
| C. | Endocytosis |
| D. | Exocytosis |
| Answer» C. Endocytosis | |
| 3177. |
Bulk drinking of fluid by cells is termed as [CBSE PMT 1993; CPMT 2000] |
| A. | Phagocytosis |
| B. | Pinocytosis |
| C. | Cyclosis |
| D. | Osmosis |
| Answer» C. Cyclosis | |
| 3178. |
Thickness of bimolecular lipid layer is generally |
| A. | \[\text{20 }\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| B. | \[\text{30 }\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| C. | \[\text{40 }\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| D. | \[\text{60 }\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| Answer» D. \[\text{60 }\overset{\text{o}}{\mathop{\text{A}}}\,\] | |
| 3179. |
Which one enzyme of plasma membrane gets inactivated in the absence of lipids |
| A. | ATPase |
| B. | Alkaline phosphatase |
| C. | Acid phosphomonoesterase |
| D. | RNAase |
| Answer» B. Alkaline phosphatase | |
| 3180. |
Which one of the following is present outside the plasma membrane but inside the cell wall |
| A. | Sphaerosome |
| B. | Peroxisome |
| C. | Lomasome |
| D. | Golgi body |
| Answer» D. Golgi body | |
| 3181. |
For cell membrane, name "plasmalemma'' was given by |
| A. | Porter |
| B. | Nageli |
| C. | Cramer |
| D. | J. Q. Plowe |
| Answer» E. | |
| 3182. |
Who proposed the concept of unit membrane for tripartite structure |
| A. | Davson and Deniell |
| B. | Robertson |
| C. | Sanger and Singer |
| D. | Scifriz |
| Answer» C. Sanger and Singer | |
| 3183. |
The main difference between pinocytosis and phagocytosis is |
| A. | Taking in of fluid substances and engulfing of food material and foreign bodies |
| B. | Taking in of small and large particles respectively |
| C. | Taking in of small amount of liquid and large volume of liquids |
| D. | None of the above |
| Answer» B. Taking in of small and large particles respectively | |
| 3184. |
Every living cell has a [DPMT 1981] |
| A. | Membrane |
| B. | Food vacuole |
| C. | Chloroplast |
| D. | Cell wall |
| Answer» B. Food vacuole | |
| 3185. |
Which of the following structures controls the transport of the material into and out of living cells [NCERT 1978; BHU 1999] |
| A. | Centrosome |
| B. | Cell membrane |
| C. | Cell wall |
| D. | Ribosome |
| Answer» C. Cell wall | |
| 3186. |
According to the 'Unit membrane model' the thickness of the cell membrane is about [MP PMT 1994] |
| A. | 200 nm |
| B. | 7.5 nm |
| C. | 150 nm |
| D. | 1.0 nm |
| Answer» D. 1.0 nm | |
| 3187. |
The secretory material is discharged by the golgi vesicles, from the surface of cell membrane by |
| A. | Pinocytosis |
| B. | Endocytosis |
| C. | Reverse pinocytosis |
| D. | Dissolving the cell membrane |
| Answer» D. Dissolving the cell membrane | |
| 3188. |
Plasma membrane is made up of [MP PMT 1997, 2001; CBSE PMT 2002] |
| A. | A protein layer between two lipid layers |
| B. | A lipid layer between two protein layers |
| C. | A protein, a lipid and a cellulose layer |
| D. | Bimolecular lipid layer surrounded by protein layers |
| Answer» E. | |
| 3189. |
The plasma membrane is composed of [MP PMT 1996] |
| A. | Proteins |
| B. | Lipids |
| C. | Carbohydrates |
| D. | Both proteins and lipids |
| Answer» E. | |
| 3190. |
Negative phototropism occurs in [Tamil Nadu 2001] |
| A. | Root |
| B. | Stem |
| C. | Leaf |
| D. | Flower |
| Answer» B. Stem | |
| 3191. |
The best material for demonstrating streaming movements of protoplasm within living cells is [CPMT 1985; BHU 1986] |
| A. | Staminal hairs of Tradescantia |
| B. | Onion peelings |
| C. | Pith cells |
| D. | None of the above |
| Answer» B. Onion peelings | |
| 3192. |
Movements of tentacles in Drosera are [RPMT 1984; AFMC 1997; JKCMEE 2002] |
| A. | Photonastic |
| B. | Thermonastic |
| C. | Thigmonastic |
| D. | Seismonastic |
| Answer» D. Seismonastic | |
| 3193. |
Protoplasmic streaming movements are referred as [DPMT 1985] |
| A. | Autonomic movements of locomotion |
| B. | Thigmonasty |
| C. | Photonasty |
| D. | Movements of curvature |
| Answer» B. Thigmonasty | |
| 3194. |
Thigmotropism is best observed in [BHU 2005] |
| A. | Roots |
| B. | Leaves |
| C. | Tendrils |
| D. | Stems |
| Answer» D. Stems | |
| 3195. |
Shock movement in 'Touch me not' plant is [Orissa JEE 2005] |
| A. | Seismonasty |
| B. | Photonasty |
| C. | Chemonasty |
| D. | Thermonasty |
| Answer» B. Photonasty | |
| 3196. |
Opening of a flower and drooping of a bud are examples of [Kerala PMT 2004] |
| A. | Nyctinasty |
| B. | Hyponasty |
| C. | Seismonasty |
| D. | Moment of curvature |
| E. | Epinasty |
| Answer» F. | |
| 3197. |
Stimulus for flowering accepted by [MP PMT 2005] |
| A. | Young leaves |
| B. | Mature leaves |
| C. | Stem tissues |
| D. | None of the above |
| Answer» B. Mature leaves | |
| 3198. |
Tertiary roots are [BHU 1979] |
| A. | Positively geotropic |
| B. | Negatively geotropic |
| C. | Plagiogeotropic |
| D. | Ageotropic |
| Answer» E. | |
| 3199. |
Leaf of Mimosa droops down on touching because of [CPMT 1996; BHU 2000] |
| A. | Water loss from leaflet bases |
| B. | Changes in water concentration |
| C. | Loss of water from cells to intercellular spaces in pulvinus and pulvinules |
| D. | All the above |
| Answer» D. All the above | |
| 3200. |
The area of photoperception is |
| A. | Region of elongation |
| B. | Tip |
| C. | Young leaves |
| D. | Axillary buds |
| Answer» C. Young leaves | |