The objective of 'Ramsar Convention' was
forest conservation
wildlife conservation
wetland conservation
biodiversity conservation
Which of the following human parasites require mosquito to complete their life-cycle?
Ascaris tumbricoides and Wuchereria bancrofti
Leishmania donovani and Plasmodium ovale
Ascaris lumbricoides and Leishmania donovani
Wuchereria bancrofti and Plasmodium ovale
In which diagnostic system, piezoelectric effect and reverse piezoelectric effect are involved?
EEG
CAT
USG
MRI
Main cause of eutrophication is
fluctuation of temperature
unusual growth of aquatic vegetations
enrichment of nutrients
abundance of microorganisms
If the sequence of bases in the coding strand of a double-stranded DNA is 5'-GTTCGAGTC-3', the sequence of bases in its transcript will be
5'-GACUCGAAC-3'
5'-CAAGCUCAG-3'
5'-GUUCGAGUC-3'
5'-CUGAGCUUG-3'
Immunity that develops in the foetus after receiving antibodies from mother's blood through placenta is
naturally acquired active immunity
artificially acquired active immunity
naturally acquired passive immunity
artificially acquired passive immunity
Which of the following processes was discovered by Lederberg and Tatum (1946)?
Transduction
Transformation
Asexual reproduction
Conjugation
The component of bacteria that retains the crystal violet stain during Gram staining is
O- antigen
lipopolysaccharide
peptidoglycan
cytoplasmic membrane
C.
peptidoglycan
Gram staining is the method of differentiating bacterial species into two large groups, i.e., Gram positive and Gram negative bacteria based on the physical properties of their cell walls.
In the process of Gram staining
- alcohol is used for decolourlisation process. It solubilises lipid but does not solubilise peptidoglycan layer.
As Gram positive bacteria has less lipid percentage as compared to peptidoglycan. Thus, peptidoglycan which does not get solubilised retain the Gram stain and Gram negative bacteria which has thinner peptidoglycan layer cannot retain the Gram stain.
During gene cloning, the enzyme used to join the insert DNA with the plasmid vector is
DNA ligase
restriction endonuclease
alkaline phosphatase
exonuclease