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Conjugation in E. coli is a microbial process wherein conjugative plasmids are transferred from one bacterium to another that does not possess it. This requires physical contact between the cells involved in the transfer. In an experiment performed in a sterilized U-tube, strains P (resistance to ampicillin encoded in its plasmid) and Q (resistance to tetracycline encoded in its genome) were grown in an appropriate medium without an antibiotic. A 0.22μm pore size nitrocellulose membrane placed in between the two arms serves as a partition. In a parallel identical experiment the 0.22μm membrane was replaced by a 30μm nitrocellulose membrane. After allowing enough time for the conjugation process to occur, an aliquot from each arm is plated on either ampicillin or tetracyclin antibiotic containing plate. Choose the correct statement about the outcome of the experiment.

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Important Questions on Biodiversity

EASY
The true nucleus is absent in:
MEDIUM
The primary producers of the deep-sea hydrothermal vent ecosystem are
EASY
Which of the following are found in extreme saline conditions?
EASY
The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the:
EASY
DNA replication in bacteria occurs
EASY
The guts of cow and buffalo possess:
EASY
Ruminant animals can digest cellulose in their food, whereas human beings are unable to do so. This is because.
EASY
Which one of the following statements is wrong?
EASY
Pick up the wrong statement.
EASY
Anoxygenic photosynthesis is characteristic of:
EASY
A bacterial colony is produced from
EASY
Archaebacteria differs from eubacteria in:
EASY
Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
EASY
Which of the following is incorrect about Cynobacteria?
MEDIUM

Match the following lists:

  List-I   List-II
(A) Photoautotroph (I) Nitrosomonas
(B) Chemoautotroph (II) Rhodospirillum
(C) Photoheterotroph (III) Salmonella
(D) Chemoheterotroph (IV) Chlorobium

The correct match is:

EASY
Identify combination of incorrect statements related to Cyanobacteria
I. Cyanobacteria are referred to as blue-green algae.
II. They perform oxygenic photosynthesis in chloroplasts.
II. The red-colour of red-sea is due to the presence of a cyanobacterial species Trichodesmium erythraeum.
IV. All the cyanobacterial species can fix atmospheric N2 in specialised cells called heterocysts.
EASY

Bacteria are grouped under four categories based on their shape. Study the given figure and identify A. B. C and D?

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EASY
In a mixed culture of slow and fast growing bacteria, penicillin will