Cell the Unit of Life Multiple Choice Questions (MCQs) with Answers

1 Select the wrong statement from the following

A The chloroplasts are generally much larger than mitochondria

B Both chloroplast and mitochondria contain an inner and outer membrane

C Both chloroplast and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane

D Both chloroplast and mitochondria contain DNA

Answer:Both chloroplast and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane

2 Which one of the following statements regarding mitochondrial membrane is not correct?

A The outer membrane is permeable to all kinds of molecules

B The enzymes of the electron transfer chain are embedded in the outer membrane

C The inner membrane is highly convoluted forming a series of inflodings

D The outer membrane resembles a sieve

View Answer

Answer: The enzymes of the electron transfer chain are embedded in the outer membrane

3 A major breakthrough in the studies of cells came which the development of electron microscope. This is because

A The resolution power of the electron microscope is much higher than that of light microscope

B The resolving power of the electron microscope is 200-350nm as compared to 0.1-0.2 nm for the light microscope

C Electron beam can pass through thick materials whereas light microscopy requires thin sections

D The electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons

View Answer

Answer: The resolution power of the electron microscope is much higher than that of light microscope

4 The term “Glycocalyx” is used for

A A layer surrounding the cell wall of bacteria

B A layer present between cell wall and membrane of bacteria

C Cell wall of bacteria

D Bacterial cell genetically engineered to possess N-glycosylated proteins

View Answer

Answer: A layer surrounding the cell wall of bacteria

5 Why is a capsule advantageous to a bacteria?

A It allows the bacterium to attach to the surface

B To protect bacterium from desiccation

C It provides means of locomotion

D It allows bacterium to hide from host’s immune system

View Answer

Answer: It allows bacterium to hide from host’s immune system

6 Which one of the following organisms is not an example of eukaryotic cells

A Amoeba proteus

B Paramoecium caudatium

C Escherichia coli

D Euglena viridis

View Answer

Answer: Escherichia coli

7 The main organelle involved in modification and routing of newly synthesized proteins to the destination is

A Mitochondria

B ER

C Lysosome

D Chloroplast

View Answer

Answer: ER

8 A student wishes to study the cell structure under a light microscope having 10X eyepieace and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution

A Yellow

B Green

C Blue

D Red

View Answer

Answer:Blue

9 Chlorophyll in chloroplasts is located in

A Grana

B Pyrenoid

C Stroma

D Both (1) and (2)

View Answer

Answer: Grana

10 Protein synthesis in animal cell occurs

A Only on the ribosomes present in cytosol

B Only ribosomes present in cytoplasm as well as in mitochondria

C Only on ribosomes attached to the nuclear envelope and ER

D On ribosomes present in the nucleolus as well as in cytoplasm

View Answer

Answer:Only ribosomes present in cytoplasm as well as in mitochondria

11 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 aspects. In this regard, which one of the following statements 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 lipid bilayer

D Many proteins remain completely embedded within the lipid bilayer

View Answer