short answer, yes. Otherwise how can anything useful or meaning be effectively done with the huge volumes data that biologists now have quite frequently. They should also work on their statistics background to so that they can do more sophisticated model / hypothesis testing, but that's a whole separate issue that gets into the matter of education and community incentives and this is not the appropriate forum for that latter topic.
A computer scientist can effectively analyse large volumes of biological data, I'm not convinced a biologist could do the same because there is just so much computer science related to visualisation, graphics programming and data modelling and their prerequisites.
A person who did 1/2 and 1/2 would likely not have enough knowledge or experience to do either the biology or cs side particularly well.
Not to mention, there are very few people I know who are good at both biology and cs.
I briefly looked it up, molecular biology would be a good fit though its pretty-much chemistry. It entirely depends on which areas are studied in biology.
I agree, but only up to a point. Astronomers need to understand telescopes, but astronomy is about studying distant objects. The same applies to biology -- biologists are not bioinformatics specialists.
