In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?
61
60
20
64
A.
61
Out of 64 codons, three (UM, UAG, UGA) are chain terminating codons. The translating mechanism is not able to read these codons.
(a) 61 codons are used to code all the 20 essential amino acids.
(b) Out of 64, 3 codons, UAA, UAG, UGA do not code any amino acid molecule
Abundance of a species in a population, within habitat is called
niche density
absolute density
relative density
geographic density
Which of the following plants are used as green manure in crop fields and in sandy soils?
Saccharum munja and Lantana camara
Dichanthium annulatum and Azolla nilotica
Crotalaria juncea and Alhagi camelorum
Calotropis procera and Phyllanthus niruri
In a flowering plant, archesporium gives rise to
wall and tapetum
only tapetum and sporogenous cells
only wall of the sporangium
both wall and sporogenous cells
During translation initiation in prokaryotes, a GTP molecule is needed in
association of 30S, mRNA with formyl-met-tRNA
association of 50S subunit of ribosome with initiation complex
formation of formyl-met-tRNA
binding of 30S subunit of ribosome with mRNA
Which one of the following bacteria has found extensive use in genetic engineering work in plants?
Bacillus coagulens
Agrobacterium tumefaciens
Bacillus subtilis
E. coli
