Cell Membrane

Q. $\text{Assertion (A):}$ Lipids are not strictly macromolecules, yet they come under acid insoluble fraction.
$\text{Reason (R):}$ Lipids are arranged into structure of cell membranes and membrane fragments in the form of acid insoluble vesicles that get separated along with acid insoluble pool.
In the light of above statements, choose the correct answer from the options given below.

1. (A) is true, (R) is false
2. Both (A) & (R) are true and (R) is the correct explanation of (A)
3. Both (A) & (R) are true and (R) is not the correct explanation of (A)
4. (A) is false, (R) is true

Q. The cells of the human cheek have an outer membrane as the delimiting structure of cell. This membrane is

1. Permeable and symmetrical
   
2. Non-permeable and asymmetrical
   
3. Selectively permeable and asymmetrical
   
4. Semipermeable and symmetrical
   

Q.

The detailed structure of the membrane was studied after the advent of the electron microscope during

1. 1990's

2. 1950's

3. 1930's

4. 1970's

Q.

Which type of membrane is most abundant within a cell?

1. Golgi membrane

2. Plasma membrane

3. ER membrane

4. Nuclear membrane

Q.

Chloroplast DNA is mostly

1. Circular

2. Linear

3. Semi circular

4. Single stranded

Q. The fluid mosaic model was proposed by Singer and Nicolson to explain the structure of

1. cell wall
2. cell membrane
3. glycocalyx
4. capsule

Q. How many of the given cellular components is/are not present in most of the plant cells?

Cell wall, Plastids, Large central vacuole, Centrosome

दिये गये कितने कोशिकीय घटक अधिकांश पादप कोशिकाओं में उपस्थित नहीं होते हैं?

कोशिका भित्ति, प्लास्टिड, वृहत केंद्रीय रसधानी, तारककाय

1. Four
   
   चार
2. Three
   
   तीन
3. Two
   
   दो
4. One
   
   एक

Q. Which of the following organelles is contributed to the zygote by the sperm?

1. Centriole
2. Lysosomes
3. Smooth endoplasmic reticulum
4. Mitochondria

Q.

The gastric juice contains

1. Trypsin, Pepsin, Lipase

2. Pepsin, Lipase, Rennin

3. Trypsin, Pepsin, Rennin

4. Pepsin, Amylase, Trypsin

Q. Identify the $\text{incorrect}$ statement.

1. Theodore Schwann reported plasma membrane in plant cell.
   
2. Unicellular organisms are capable of independent existence.
   
3. All living organisms are composed of cell and products of cells.
   
4. Rudolf Virchow modified hypothesis of Schleiden and Schwann to givecell theory a final shape.
   

Q. ________________ facilitates the cells by connecting the cytoplasm of adjoining cells, for rapid movement of ions, small molecules and sometimes big molecules.

1. Tight junction
2. Gap junction
3. Adhering junction
4. Desmosomes

Q. explain ribosome and inclusion bodies?

Q. In amoeboid movement, according to Goldacre and Lorsch, cytoplasm solates due to ______________.

1. Folding of protein molecules
2. Sliding of actin molecules
3. Sliding of myosin molecules
4. Unfolding of protein molecules

Q. A RBC and a plant cell (with thick cell wall) are placed in distilled water. The solute concentration is the same in both the cells. What changes would be observed in them (A) The RBC would increase in size and burst while the plant cell would remain about the same size. (B) The plant cell would increase in size and burst while the RBC would remain about the same size. (C) Both plant cell and RBC would decrease in size and collapse. (D) Both plant cell and RBC would not undergo any change

Q. Which of the following are non-membrane bound organelles?

1. Nucleolus
2. Ribosomes
3. Centrosome
4. All of these

Q. In plasma membrane will the extrinsic and intrinsic proteins be attached together?

Q. The vacuole occupies 70-90% of cell of plant protoplasm yet we say that in plant cell nucleus is the largest cell organelle followed by plastids followed by mitochondria. Why is that?

Q. Which one of the following does not differ in E. coli and Chlamydomonas?

1. Cell wall
2. Cell membrane
3. Ribosomes
4. Chromosomal organization

Q. Why is cell membrane called a selectively permeable membrane?

1. It is permeable only during certain stage of the cell division.
2. It allows only selective molecules to pass through it.
3. It allows only water to pass.
4. It is made up of lipids.

Q.

Which of the factor(s) determine the fluidity of the plasma membrane?

1. Number of water molecules in the membrane

2. Number of proteins

3. Length of the lipids

4. Number of unsaturated lipids

Q. In fluid mosaic model of plasma membrane:

1. Upper layer is non-polar and hydrophilic
2. Polar layer is hydrophobic
3. Phospholipids form a bimolecular layer in middle part
4. Proteins form a middle layer