Cell Envelope of a Bacterial Cell

Q. Transcription in prokaryotic cell is :

1. Initiated at a start codon with the help of initiation factors and the small subunit of the ribosome
   
2. Initiated at a promoter using one of three RNA polymerases (RNA polymerase II)
3. Initiated at a promoter and uses only one strand of DNA, the template strand, synthesize a complementary RNA strand
   
4. Is terminated at stop codons

Q. Select the correct sequence of prokaryotic cell envelope from the outermost to the innermost layer.

1. Cell membrane $\to$ Cell wall $\to$ Glycocalyx
2. Cell wall$\to$ Cell membrane $\to$ Glycocalyx
3. Glycocalyx $\to$ Cell wall $\to$ Cell membrane
4. Glycocalyx $\to$ Cell membrane $\to$ Cell wall

Q. Mesosomes are the infoldings of cell membrane which
(i) are present in both prokaryotic and eukaryotic cells
(ii) help in cell wall formation, DNA replicaiton and respiration
(iii) increase the surface area of plasma membrane

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (ii)
4. (i), (ii) and (iii)

Q.

Do bacteria have a cell wall?

Q.

Do both prokaryotes and eukaryotes have a cell membrane?

Q.

What are the functions of mesosomes in a prokaryotic cell?

Q.

What is a prokaryotic cell?

Q.

Which of the following prokaryotic cells lacks a cell wall?

1. Cyanobacteria
2. Mycoplasma
3. Actinomycetes
4. Archaebacteria

Q. The cell wall of bacteria is made up of

1. chitin
2. peptidoglycan
3. cellulose
4. pectin

Q.

Why do bacteria have a negative charge?

Q.

What are the 2 subunits of 80S Ribosomes?

Q.

Two alternating amino sugars, namely N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) make up the

1. The peptidoglycan cell wall of the bacteria
2. The flagella of the bacteria

3. The capsule of the bacteria

4. The sex pili of the bacteria

Q. Slime layer in bacteria is a part of

1. cell wall
2. glycocalyx
3. cell membrane
4. both b and c

Q.

Which of the following are characteristics of both bacteria and fungi?

1. Cell wall, unicellular and mitochondria

2. Cell wall, DNA and plasma membrane

3. Plasma membrane, multicellularity and Golgi apparatus

4. Nucleus, organelles and unicellularity

Q.

The RNA Is Not Found In:

1. Ribosome

2. Nucleolus

3. Chromosome

4. plasmalemma

Q. Arrange the structures from inside to the outside as observed in a bacterial cell.

1. Glycocalyx 2. Cell membrane 3. Cell wall 4. Cytoplasm

1. Glycocalyx, cell wall, cell membrane, cytoplasm
2. Cytoplasm, cell membrane, cell wall, glycocalyx
3. Cell wall, glycocalyx, cell membrane, cytoplasm
4. Cytoplasm, cell membrane, glycocalyx, cell wall

Q. Which among the following is an incorrect statement?

1. The walls of diatoms are easily destructible
2. ‘Diatomaceous earth’ is formed by the cell walls of diatoms
3. Diatoms are the chief producers in the oceans
4. Diatoms are microscopic and float passively on water

Q.

In diatoms shell is made up of ----------------

Q. Choose the wrong statements regarding bacterial cell:

1. Glycocalyx is the outermost envelope in bacteria.
2. The glycocalyx could be a loose sheath called capsule.
3. The glycocalyx may be thick and tough called slime layer.
4. A special structure formed by the plasma membrane is called mesosome.
5. Small bristle like fibres sprouting out of the cell are called fimbriae.

1. 1 and 2
2. 2 and 3
3. 1 and 4
4. 1 and 3

Q. Which of the following is not a structure of prokaryotic flagella?

1. Filament
2. Basal body
3. Centriole
4. Hook

Q. Mention the functions of Cytoplasm.

Q.

Bacterial cells have a chemically complex cell envelope. The cell envelope consists of a tightly bound three-layer structure, i.e., the

1. Outermost cell wall followed by the plasma membrane and then the glycocalyx

2. Outermost cell wall followed by the glycocalyx and then the plasma membrane

3. Outermost glycocalyx followed by plasma membrane and the cell wall

4. Outermost glycocalyx followed by the cell wall and then the plasma membrane

Q.

Do Eukaryotes have a cell envelope?

Q. Slime layer in bacteria is a part of

1. cell wall
2. glycocalyx
3. cell membrane
4. both b and c

Q. Succus entericus does not contain:

1. Dipeptidase
2. Sucrase
3. Nuclease
4. All of the above

Q.

In prokaryotes the glyocalyx when it is thick is called

1. Slime layer

2. Mesosome

3. Capsule

4. Cell wall

Q. Read the following statements and select the correct option.
(i) Lightly stained regions of chromatin are called heterochromatin.
(ii) Dark stained region of chromatin is called euchromatin.
(iii) In prokaryotes, DNA is organised in large loops in the nucleoid region, by positively charged proteins.

1. Statements (i) and (ii) are true, but statement (iii) is false
2. Statements (i) and (ii) are false, but statement (iii) is true
3. Statements (ii) and (iii) are true, but statement (i) is false
4. All statements are true

Q. Identify the components labelled as A, B, C and D in the given figure of cell membrane from the list (i) to (vii) given along with the diagram and select the correct option.


Components:
(i) Sugar
(ii) Protein
(iii) Lipid bilayer
(iv) Integral protein
(v) Cytoplasm
(vi) Cell wall
(vii) External protein
The correct matching of components is

1. A-(i), B-(ii), C-(iii), D-(iv)
2. A-(ii), B-(i), C-(iii), D-(iv)
3. A-(i), B-(ii), C-(iii), D-(vi)
4. A-(i), B-(ii), C-(iii), D-(vii)

Q.

cell wall in higher plants is made up of??

Q. Oxysomes are unique to

1. Golgi complex
2. Mitochondria
3. Chloroplast
4. Endoplasmic Reticulum