During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure, what is it’s DNA-binding sequence?
TTAA
AATT
CACC
CACC
D.
CACC
TATA box is present in eukaryotic promotor region. It has a resemblance with pribnow box of prokaryotes. TATA box was identified by Dr. Hogness and so, it is called as Hogness box. It is a 7 bp long region located 20 bp upstream to the start point. During the process of transcription the RNA polymerase (a holoenzyme which has a core unit and sigma factor for proper initiation of transcription) binds to TATA box due to which DNA assumes a saddle-like structure at this place.
In gymnosperms, the pollen chamber represents
a cell in the pollen grain in which the sperms are formed.
a cavity in the ovule in which pollen grains are stored after pollination
an opening in the megagametophyte through which the pollen tube approaches the egg
an opening in the megagametophyte through which the pollen tube approaches the egg
Industrial melanism as observed in peppered moth proves that
The true black melanic forms arise by a recurring random mutation.
The melanic form of the moth has no selective advantage over lighter form in industrial area
The lighter-form moth has no selective advantage either in polluted industrial area or non-polluted area
The lighter-form moth has no selective advantage either in polluted industrial area or non-polluted area
Differentiation of organs and tissues in a developing organism, is associated with
developmental mutations
differential expression of genes
lethal mutations
lethal mutations
Lysozyme that is present in perspiration, saliva and tears, destroys
certain fungi
certain types of bacteria
all viruses
all viruses
The Okazaki fragments in DNA chain growth
result in transcription
polymerize in the 3’ - to - 5’ direction and forms replication fork
prove semi-conservative natuire of DNA replication
prove semi-conservative natuire of DNA replication
Which one of the following is a viral disease of poultry?
Salmonellosis
Coryza
New castle disease
New castle disease
Inheritance of skin colour in humans is an example of
chromosomal aberration
point mutation
polygenic inheritance
polygenic inheritance
Which one of the following pairs is mismatched?
Pila globosa - pearl
Apis indica - honey
kenia lacca - lac
kenia lacca - lac
