Which group marks the 3' end of DNA?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Which group marks the 3' end of DNA?

Explanation:
The 3' end is defined by the free hydroxyl group attached to the 3' carbon of the terminal deoxyribose in DNA. This -OH is the attachment point for the next nucleotide during DNA synthesis, since nucleotides are added to the growing strand by forming a phosphodiester bond between the 3' OH of the last nucleotide and the 5' phosphate of the incoming one. That makes the strand extend in the 5' to 3' direction, with the 5' end carrying a phosphate and the 3' end carrying the free 3'-OH. The phosphate group marks the 5' end, not the 3' end, and amino or methyl groups do not define DNA strand ends.

The 3' end is defined by the free hydroxyl group attached to the 3' carbon of the terminal deoxyribose in DNA. This -OH is the attachment point for the next nucleotide during DNA synthesis, since nucleotides are added to the growing strand by forming a phosphodiester bond between the 3' OH of the last nucleotide and the 5' phosphate of the incoming one. That makes the strand extend in the 5' to 3' direction, with the 5' end carrying a phosphate and the 3' end carrying the free 3'-OH. The phosphate group marks the 5' end, not the 3' end, and amino or methyl groups do not define DNA strand ends.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy