Who is responsible for the security of various levels of your application architecture?
It is identical from cloud service to cloud service and can be treated as consistent across all services.
It varies depending on the cloud service, and needs to be mapped out for each and every cloud service you use to make sure all security aspects are covered.
The cloud service provider is responsible for all aspects of the security of your cloud-based application architecture.
It cannot be easily determined from the data given to you by the cloud provider.