MCQ BIOLOGY2023-01

 

1. Which cells have routinely used to understand structure of plasma membrane?

a) Neurons                   b) Mylein cells

c) RBC                        d) Stem cells

 

2. Cholesterol contributes to which of the following properties of biological membranes of animals?

a) Membrane rigidity 

b) Membrane fluidity

c) Membrane permeability

d) Membrane osmolarity

 

3. Cell membrane is always

a) Static condition

b) Dynamic condition

c) Partially static condition    

d) Fragmented structure

 

4. Which of the following statements concerning biological membrane is correct?

a) Aquaporins are hollow pore

b) Lipid composition of two layers of the membrane equilibrate

c) The membrane is most fluid at the surface

d) Flip-flop movement is enzymatic process

 

5. Which of the following components is not found in cell membrane?

a) Carbohydrate

b) Isoleucine

c) Citric acid

d) Phospholipid

 

6. Mycoplasmas are bacterial cells that

a) fail to reproduce in artificial media

b) have a rigid cell wall

c) are resistant to penicillin

d) stain well with Gram’s stain

 

7. Which of the following statements about Prokaryotes is TRUE?

a) Prokaryotes lack a nucleus and therefore lack DNA.

b) Prokaryotes from proteins from 22 different amino acids.

c) Prokaryotes include bacteria, yeast, and protozoa.

d) Prokaryotes lack a membrane bound organelles

 

8. Which of the following statements about plasmodermata is correct?

a) like gap junctions, directly connect the cytoplasms of adjacent cells.

b) a new site between tunnel protein

c) globular protein network

d) an interconnected network of fibrous proteins

 

9. Which one of the following is not a membrane lipid?

a) cholesterol               b) phosphoglyceride

c) cerebroside              d) choline

 

10. Organzation of a cell has not been achieved in

a) bacteria                    b) diatom

c) bacteriophage          d) amoeba

 

11. Movement of substance across cell membrane is controlled by the

a) size of permeating particles

b) permeability of membrane

c) membrane protein

d) All of these

 

12. Which of the following events require energy?

a) pinocytosis              b) Na⁺ - K⁺ pump

c) phagocytosis           d) All of these

 

13. Which of the following statements about mitochondria is true?

a) Mitochondria are found only in plant cells.

b) Mitochondria are responsible for photosynthesis.

c) Mitochondria are the powerhouse of the cell.

d) Mitochondria contain chlorophyll.

 

14. Which of the following membrane proteins is responsible for the transportation of ions across the cell membrane?

a) Receptor proteins    b) Channel proteins

c) Enzymes                  d) Cell adhesion molecules

 

15. What is the main function of cholesterol in the cell membrane?

a) Facilitates cell-to-cell communication

b) Provides structural support

c) Regulates the fluidity of the membrane

d) Acts as a barrier against pathogens

16. Which of the following is NOT found within the nucleus?

a) Nucleoplasm          

b) Nucleoli

c) Nuclear pores

d) Smooth endoplasmic reticulum

 

17. Which of the following is TRUE regarding the nuclear membrane?

a) It is a single-layered structure.

b) It allows free movement of molecules between the nucleus and the cytoplasm.

c) It is composed of phospholipids.

d) It contains DNA and chromatin.

 

18. Which of the following cell types lacks a primary cell wall?

a) Parenchyma cells

b) Collenchyma cells

c) Sclerenchyma cells

d) Epidermal cells

 

19. Which component of the plant cell wall helps to waterproof and protect the outer surface of leaves and stems?

a) Cutin                       b) Lignin

c) Pectin                      d) Hemicellulose

 

20. Which of the following is responsible for the flexibility and elasticity of the plant cell wall?

a) Lignin          b) Hemicellulose

c) Pectin          d) Cutin

 

21. What is the role of the middle lamella in the plant cell wall?

a) Anchoring adjacent cells together

b) Maintaining cell shape

c) Regulating water uptake

d) Facilitating cell communication

 

22. Which layer of the plant cell wall is responsible for providing rigidity and strength?

a) Primary cell wall     b) Secondary cell wall

c) Middle lamella        d) Pectin layer

 

23. What is the primary component of the plant cell wall?

a) Cellulose                 b) Cholesterol

c) Phospholipids          d) Proteins

 

24. Which of the following is NOT a function of the plant cell wall?

a) Protection against mechanical stress

b) Regulation of cell division

c) Maintenance of cell shape

d) Control of water balance

 

25. Addition of new cell wall particles amongst the existing ones is

a) deposition               b) apposition

c) intussusceptions      d) aggregation

 

26. According of fluid mosaic model, plasma membrane is composed of

a) phospholipids and oligosaccharides

b) phospholipids and hemicelluloses

c) phospholipids and integral proteins

d) phospholipids, extrinsic proteins and intrinsic proteins

 

27. 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 flipflop movement)?

a) Both lipids and proteins can flip-flop

b) While lipids can rarely flip-flop, protein can not

c) While proteins can flip-flop, lipids can not

d) Neither lipids, nor proteins can flip-flop

 

28. The protein deals with the stability of  chromosomes are

a) Histones                   b) Non-Histone

c) both a and b            d) None of these

 

29. The place in the mitochondrion where pH is lowest during aerobic respiration in the

a. matrix                                  b. cytosol

c. intermembrane space           d. mitochondrial

 

30. Cytochromes are found in

a) Cristae of mitochondria

b) matrix of mitochondria

c) outer wall of mitochondria

d) lysosomes of bacteria and virus