Nucleic acids and chromatin
Nucleic acids and chromatin

This free course is available to start right now. Review the full course description and key learning outcomes and create an account and enrol if you want a free statement of participation.

Free course

Nucleic acids and chromatin

Ultraviolet irradiation

The nucleic acid bases absorb electromagnetic radiation in the ultraviolet (UV) region of the spectrum. The major photoproducts in DNA, generated upon exposure to UVB light, are structures called pyrimidine dimers which are formed from two adjacent pyrimidine bases, as shown in Table 3d. The formation of such dimers introduces a substantial amount of strain into the structure of DNA. This damage is detected and the dimer repaired by specialist repair machinery, However, if pyrimidine dimers are left unrepaired, they can block replication.


Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to university level study, find out more about the types of qualifications we offer, including our entry level Access courses and Certificates.

Not ready for University study then browse over 900 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus