Embibe Experts Solutions for Exercise 1: EXERCISE

Identify the incorrect statement:

I) Pili is found in E. coli.
II) Teichoic acid is absent in Gram-ve bacteria.
III) Mesosomes increase the absorption of the nutrients in Gram-ve bacteria.

IV) Spherical shaped bacteria do not form chains.

Read the statements:
A) In Gram +ve bacteria infoldings of cell membrane are called mesosomes.
B) Mesosomes help in the formation of daughter cells during endospore formation.
C) Mesosomes do not help in chromosomal replication and its distribution to daughter bacteria.
D) Mesosomes do not increase the absorption of gases.

Select the incorrect statements.

Read the statements and identify the correct option :

$I$) Some bacteria possess plasmids as self replicating, circular ds DNA in the cytoplasm.
$II$) Plasmids can exist independently in the cytoplasm (or) may be integrated with nucleoid.
$III$) Plasmids are also called F-Factors.
$IV$) Drug resistance, metabolic pathways and new pathogenic abilities are exhibited by plasmids due to presence of genes.

Photoautotrophic bacteria synthesize food material by using
I) Chemical energy in organic substances
II) ${\mathrm{CO}}_2$
III) Organic form of carbon
IV) Light energy

Study the following table

Which two taxa shows the correct combination?

Photosynthetic bacteria which help in nitrogen fixation is / are
I) Rhodospirillum
II) Azospirillum
III) Clostridium
IV) Chlorobacterium

Study the following table

The correct combination is