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DN200 Science

The UCD Science course is a common-entry course which offers 27 degree subjects categorised into the following streams:

Students can study subjects from more than one stream in First Year. It is also possible for students to change their stream in First Year. Prospective students can email gary.dunne@ucd.ie or orla.donoghue@ucd.ie if you have any queries about studying Science at UCD. 


Biological, Biomedical & Biomolecular Sciences Stream 
Earth & Environmental Sciences Stream
Chemistry (includes Medicinal/Sustainable/Biophysical) Stream
Mathematics (includes Applied/Financial/Statistics) Stream
Physics (includes Theoretical/Astronomy & Space Science) Stream
Science, Mathematics & Education Stream
Explore Multiple Streams

The Explore Multiple Streams option is for students who are interested in degrees in different streams. For example, a student may be interested in Genetics and Chemistry. As Genetics is in the Biological, Biomedical & Biomolecular Sciences stream and Chemistry is in the Chemistry stream, students interested in these subjects can choose Explore Multiple Streams.

Students who choose the Explore Multiple Streams are offered the same First Year module guarantees as students who choose the other streams.

Is Science (DN200) a General Science degree?

DN200 is not a “General Science” degree; it is a common entry course where students specialise in one of 27 subjects for their final degree (e.g. BSc Financial Mathematics, BSc Chemistry etc.)

Why should I choose a common entry course?
  • This course is ideal if you are undecided about which area of Science interests you most as students have the flexibility to explore the full range of Science subjects.
  • The flexible curriculum allows students to specialise in First Year should they know what they want to study. For example, if you are only interested in Physics, you can focus your studies from First Year onwards in Physics.
  • The number of compulsory modules has been kept low to allow to you try out other subjects that you may not be familiar with or to deepen your interest in the areas that you wish to pursue to degree level.
  • Students make an informed decision about their degree subject at the end of Second Year.
When do I select my degree major?

At the end of First Year, students choose a minimum of two subjects to study in Second Year (for example Statistics and Mathematics). Students will will choose one of these as their degree subject in Third and Fourth Year. 

DN200 Science Frequently Asked Questions

When you select DN200, you can make one of the following selections from the drop-down list:

  • Explore Multiple Streams
  • Biological, Biomedical & Biomolecular Sciences
  • Earth & Environmental Sciences
  • Chemistry (includes Medicinal/Sustainable/Biophysical)
  • Mathematics (includes Applied/Financial/Statistics)
  • Physics (includes Theoretical/Astronomy & Space Science)
  • Science, Mathematics & Education

You can change your mind when you arrive at UCD.

The Explore Multiple Streams option is for students who are interested in degrees in different streams. For example, a student may be interested in Genetics and Chemistry. As Genetics is in the Biological, Biomedical & Biomolecular Sciences stream and Chemistry is in the Chemistry stream, students interested in these subjects can choose Explore Multiple Streams. Students who choose the Explore Multiple Streams are offered the same First Year module guarantees as students who choose the other streams.

DN200 is one course which means you can only put it down on your CAO form once.

We recommend that all incoming First Year Science students read the Science Student Handbook and the First Year Guide, which are available on the Science website on our Current Undergraduate Science Students page. These documents include information on the module combinations available in First Year.

Each stream has a set number of compulsory modules you must take in First Year in order to pursue a subject or group of subjects in Second Year and to degree level.

The number of compulsory modules has been kept low to allow you to try out other subjects that you may not be familiar with or to deepen your interest in the areas that you wish to pursue to degree level.

The flexible curriculum allows you to focus on an area from First Year or keep your options open, depending on your preference. There is plenty of advice available during the application process and when you arrive at UCD on the module combinations to study in First Year.

In First Year (Stage 1), each stream has a set number of compulsory modules you must take in First Year in order to pursue a subject or group of subjects in Second Year and to degree level. Depending on the modules you studied in First Year, you choose a minimum of 2 subjects in Second Year. Students who choose the required modules for the Biological, Biomedical & Biomolecular stream in First Year could combine Zoology with Biochemistry & Molecular Biology or Chemistry and Genetics, for example.

At the end of Second Year, students will select their subject preferences for degree subject. In Third and Fourth Year, you study your degree subject in depth.

Information on the UCD course entry requirements is available on the UCD Admissions website

Science, Mathematics and Education - DN200 Science

The Common Entry DN200 Science programmes provides students with the option to become Science and Maths teachers at postprimary level via one of our Teaching Council approved pathways. Students who opt for one of the pathways complete a 4-year BSc which leads directly a one-year MSc in Mathematics and Science Education. On completion of both degrees, you are fully qualified to teach your chosen Science subject and Mathematics to Higher Level Leaving Certificate Level.

Learn more about these subjects in the UCD Science Undergraduate Courses Entry 2023 Brochure (pdf). 

UCD College of Science

Room E1.09/E2.09 UCD O'Brien Centre for Science, University College Dublin, Belfield, Dublin 4, Ireland.
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