During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called?
CAAT box
GGTT box
AAAT box
TATA box
Three crops that contribute maximum to global food grain production are
wheat, rice and maize
wheat, maize and sorghum
rice, maize and sorghum
wheat, rice and barley
Genes for cytoplasmic male sterility in plants are generally located in
mitochondrial genome
cytosol
chloroplast genome
nuclear genome
Which one of the following hydrolysis internal phosphodiester bonds in a polynucleotide chain?
Lipase
Exonuclease
Endonuclease
Protease
The name of Norman Borlaug is associated with
green revolution
yellow revolution
white revolution
blue revolution
E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because
in the presence of glucose, E. coli cells do not utilize lactose
they cannot transport lactose from the medium into the cell
the lac operon is constitutevely active in these cells
they cannot synthesize functional - galactosidase
D.
they cannot synthesize functional - galactosidase
Lac operon is a cluster of genes encoding three proteins that bacteria use to obtain energy from the sugar lactose. There are three structural genes in lac operon.
(i) Lac Z (3063bp)- This genes codes for enzyme - galactosidase. It breaks lactose into glucose and galactose. Therefore, E. coili cells with a mutated Z genes cannot grow in medium containing only lactose as the source of energy because they cannot synthesize functional - galactosidase.
(ii) Lac Y (800 bp)- This gene codes for enzyme galactose permease. It is a membrane bound protein and helps in the transport of metabolites.
(iii) Lac A (800bp)- This gene codes for enzyme - galactose transacetylase. It transfers an acetyl group from acetyl Co- A to - galactosidase.
More than 70% of world's freshwater is contained in
Antartica
Glaciers and Mountains
Greenland
Polar ice
Which one of the following pairs is mismatched?
Biomass burning - Release of CO2
Fossil fuel burning - Release of CO2
Nuclear power - Radioactive wastes
Solar energy - Green house effect
Identify the correctly matched pair
Montreal protocol - Global warming
Kyoto protocol - Climatic change
Ramsar convention - Ground water pollution
Basal convention - Biodiversity conservation