If I take a Biology course, how to I transfer that to a Marine Biology course and have many Minors?

My recommendation is that you not worry about obtaining a Bachelor's in Marine Biology. Once you get into the field, you quickly realize that marine biology is only a term that the general public uses. You never hear anyone talk about terrestrial biology, do you?

So here's what I would do if I were you. First, I would make sure that I would be able to qualify for the major. This typically means a year of chemistry, a year of biology, a year of physics, a year of calculus, and a statistics course. It can vary depending on the college you go to. To be honest, 50% of students will fail out of that first college level chemistry course. So make sure you do well. Ideally, you would want to get a B or higher in the courses.

Now, assuming you qualify for the major, you now need to pass your upper division courses. Depending on the college you go to, there may or may not be a robust set of marine biology courses. A large part of this will depend on how close you are to the ocean. If you're located in a landlocked state, you're not out of luck. Just focus on ecology courses. Take courses in genetics, evolution, animal physiology, etc. Your undergrad work is meant to be broad in scale, so you can figure out what you like. Marine Biology is very very broad. Here's something I wished someone would have told me when I started. Take a course in programming. I highly recommend you learn Python or R. Assuming you would want to continue on to grad school, this will separate you from all the other applicants.

There is a difference between engineering and biology. They're two different things. So you're going to need to make a decision somewhere in your undergraduate career what you want to do. While it is possible to do both, it will be incredibly hard, and may mean an extra year or two in undergraduate work. Undergraduate work is everything leading to a Bachelor's.

In the lab I work in, there is a wide range of students who are completing their graduate studies. Off the top of my head, there are people with degrees in biology, geography, and computer science. The marine biology you're thinking of is more than likely someone with a Masters or PhD, which means you need to get to grad school. In order to be competitive for grad school admissions, you'll need at least a 3.5 in your undergraduate work. While it is possible to get in with a lower GPA, it is a lot harder.

How can you help yourself get into graduate school? Develop a skill that other applicants will not have. This is why I recommend that you take programming courses. Many professors are looking for this skill set. For many marine biology graduate programs, you have to be accepted by a professor first. But at this point, I'm getting ahead of myself. Focus on your undergraduate work and do well! Hope this helps!

If money is an issue, I recommend that you go to a good state school. If you're in a landlocked state, look and see if they offer an ecology/zoology major. If you're dead set on going to a school with a marine biology undergraduate program, some good schools to consider are any University of California that is on the coast (Santa Cruz, Santa Barbara, Los Angeles, San Diego), Humboldt State, California State University Monterey, Oregon State, University of Oregon, University of Washington. While I am not as familiar with the east coast, Texas A&M and Duke are great schools as well.