The steps involved in herpes simplex virus lytic cycle are: attachment on the epithelial cells. Penetration of the herpes virus inside the cell. Uncontrolled replication of the virus takes place. The virion gets assembled and finally released by bursting the cell.
Explanation:
The lytic infection of the virus results in breaking of bacterial or any cell after its replication.The lytic infection is phage infecting bacteria and getting replicated and bursts the cell of bacteria.
There are 5 stages in which lytic infection takes place in any virus like herpes simplex virus:
Attachment on bacterial cell wall:
penetration of virus
biosynthesis
maturation
release of virions
During the infection the HSV genes are expressed in the epithelial cells and get replicated resulting in sores and irritations as in genitals.
the cycle is generally 18- 20 hours long.
Answer:
d.The wing-assisted incline running theory postulates that wings were initially used to maintain balance while climbing up slopes.
Explanation:
Two theories were given to explain the origin of avian flight. The top-down theory suggested that the birds' ancestors were tree dwelling species. They took help of wings to glide from tree to tree in order to avoid predator or catch prey. The bottom up theory suggested that the birds' ancestors were ground dwelling species. They took help of wings to maintain a balance and provide a lift for efficient running.
Wing-assisted incline running was a mixture of both the above theories and gave a balanced view point. According to it, birds' ancestors used wings to maintain a balance while running up inclined slopes. The wings helped them to save energy while scaling slopes and eventually a flight mechanism was also developed.
