Multiple Choice QuestionsWhich antibiotic inhibits interaction between t-RNA and m-RNA during bacterial protein synthesis?
Erythromycin
Neomycin
Streptomycin
Streptomycin
Phenotype of an organism is the result of
mutations and linkages
cytoplasmic effects and nutrition
environmental changes and sexual dimorphism
environmental changes and sexual dimorphism
Photochemical smog pollution does not contain
ozone
nitrogen dioxide
carbon dioxide
carbon dioxide
In which mode of inheritance do you expect more maternal influence among the off spring?
Autosomal
Cytoplasmic
Y-linked
Y-linked
B.
Cytoplasmic
The more maternal influence can be expected in the cytoplasmic inheritance (i.e. the inheritance of genes contained in the cytoplasm of a cell, rather than the nucleus. The reason is that the female reproductive cell or the egg has a large amount of cytoplasm containing many such organelles which contain their own genes and can reproduce independently (e.g., mitochondria and chloroplast) and which are consequently incorporated into the cytoplasm of all the cells of the embryo. The male reproductive cells (sperm or pollen) consist almost solely of a nucleus. Cytoplasmic organelles are thus, not inherited from the male parent.
This is why, the cytoplasmic inheritance is also called maternal inheritance.
Genes located on Y-chromosome are called Y-genes and their inheritance is called Y-linked inheritance. This carries the paternal influences.
A gene located in the X-chromosomes is said to be X-linked and its inheritance is called X-linked inheritance. In this, a male transmits his X-chromosome only to his daughters while a female transmits one of her X-chromosomes to the offspring of both sexes.
Long filamentous threads protruding at the end of a young cob of maize are
anthers
styles
ovaries
ovaries
Conifers differ from grasses in the
production of seeds from ovules
lack of xylem tracheids
absence of pollen tube
absence of pollen tube
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
Three
Four
Nine
Nine
In maize, hybrid vigour is exploited by
bombarding the protoplast with DNA
crossing of two inbreed parental lines
harvesting seeds from the most productive plants
harvesting seeds from the most productive plants
Amino acid sequence, in protein synthesis is decided by the sequence of
t-RNA
m-RNA
c-DNA
c-DNA
The bacterium (Clostridium botulinum) that causes botulism is
a facultative anaerobe
an obligate anaerobe
a facultative aerobe
a facultative aerobe
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