General
✓✗Which of the following statements is not true for retroviruses?
- DNA is not present at any stage in the life cycle of retroviruses.
- Retroviruses carry gene for RNA- dependent DNA polymerase.
- The genetic material in mature retroviruses is RNA.
- Retroviruses are causative agents for certain kinds of cancer in man
General
✓✗An example for symbiotic bacteria is
- Erwinia amylovora
- Rhizobium leguminosarum
- Xanthomonas campestris
- Agrobacterium tumefaciens
General
✓✗The DNA of E.coli is
- double stranded and linear
- double stranded and circular
- single stranded and linear
- single stranded and circular
General
✓✗Which fungal disease spreads by seed and flowers?
- Loose smut of wheat
- Corn smut
- Covered smut of barley
- Soft rot of potato
General
✓✗Which one belongs to Monera?
- Amoeba
- Escherichia
- Gelidium
- Spirogyra
General
✓✗Harmful activity of Blue green algae results in
- Denitrification
- Eutrofication
- Increase alkalinity of soil
- Decrease fertility of soil
General
✓✗The ‘germs theory of disease’ was given by
- A. Leeuwenhoek
- Louis Pasteur
- Lister
- Robert Koch
General
✓✗Which one is not related to viroids?
- PSTD
- Diener
- ssRNA
- C-Jakob
General
✓✗One of the following is non-pathogenic
- Entamoeba hartmanni
- E. histolytica
- E. coli
- E. gingivalis
General
✓✗Which of the following components provides sticky character to the bacterial cell?
- Nuclear membrane
- Plasma membrane
- Glycocalyx
- Cell wall
General
✓✗Pigment containing membranous extensions in some cyanobacteria are
- pneumatophores
- chromatophores
- heterocysts
- basal bodies.
General
✓✗Total parasites belongs to protozoan group
- Sporozoa
- Ciliata
- Sarcodina
- Zooflagellata
General
✓✗Protista contains
- Euglena, dinoflagellates, and yeast
- Amoeba, paramecium, hydra
- Euglena, paramecium. mushroom
- Amoeba, paramecium. and dinoflagellates
General
✓✗Black (stem) rust of wheat is caused by
- Alternaria solani
- Ustilago nuda
- Puccinia graminis
- Xanthomonas oryzae
General
✓✗Which of the following statements is wrong for viroids?
- They cause infections.
- Their RNA is of high molecular weight.
- They lack a protein coat.
- They are smaller than viruses.