Multiple Choice QuestionsA certain patient is suspected to be suffering from Acquired Immuno Deficiency Syndrome. Which diagnostic technique will you recommend for its detection?
MRI
Ultra Sound
WIDAL
WIDAL
Which one of the following statements is correct for secondary succession?
It occurs on a deforested site
It follows primary succession
It is similar to primary succession except that it has a relatively fast pace
It is similar to primary succession except that it has a relatively fast pace
Which one of the following pairs of gases are the major cause of 'Greenhouse Effect'?
CO2 and CO
CFCs and SO2
CO2 and N2O
CO2 and N2O
Which one of the following expanded forms of the followings acronyms is correct?
UNEP = United Nations Environmental Policy
EPA = Environmental Pollution Agency
IUCN = International Union for Conservation of Nature and Natural Resources
IUCN = International Union for Conservation of Nature and Natural Resources
What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope?
Nucleotides
Nucleosomes
Base pairs
Base pairs
B.
Nucleosomes
Nucleosome is sub-microscopic sub-unit of chromatin which is formed by wrapping of DNA over a core of histone proteins. The term was coined by Oudet et. al, (1975). It is oblate structure with a length of 10 nm and a thickness of 5-5.7 nm. Its core is called nu-body. The latter is formed of four pairs of histone molecules - H2A, H2B, H3 and H4. DNA makes 1.75 turns over the octamer to form a nucleosome. Two adjacent nucleosomes are connected by a short segment of unbound DNA called linker DNA. A fifth type of histone called H1 is attached over the linker DNA. Nucleosomes appear as 'beads-on-string' in the chromosomes under electron microscope.
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
It shows energy content of different trophic level organisms
It is inverted in shape
It is upright in shape
It is upright in shape
Medical Termination of Pregnancy (MTP) is considered safe up to have many weeks of pregnancy?
Twelve weeks
Eighteen weeks
Six weeks
Six weeks
The gametophyte is not an independent, free-living generation in
Adiantum
Marchantia
Pinus
Pinus
Which one of the following have the highest number of species in nature?
Insects
Birds
Angiosperms
Angiosperms
Switch
