Two antiparallel strands bound by ____ bonds between nitrogenous bases.

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 UCF Biomedical Exit Exam. Access flashcards and multiple-choice questions with detailed hints and explanations. Prepare for success!

Multiple Choice

Two antiparallel strands bound by ____ bonds between nitrogenous bases.

Explanation:
Hydrogen bonds hold the two antiparallel DNA strands together by linking complementary bases across the strands. Adenine pairs with thymine using two hydrogen bonds, while guanine pairs with cytosine using three. This bonding is specific and weaker than covalent bonds, which keeps the sugar–phosphate backbones tied within each strand, not between them. The overall stability also comes from base stacking via hydrophobic interactions, but that stacking does not bind the strands together. Ionic bonds aren’t used for base pairing in DNA. So the bonds between the nitrogenous bases that bind the two strands are hydrogen bonds.

Hydrogen bonds hold the two antiparallel DNA strands together by linking complementary bases across the strands. Adenine pairs with thymine using two hydrogen bonds, while guanine pairs with cytosine using three. This bonding is specific and weaker than covalent bonds, which keeps the sugar–phosphate backbones tied within each strand, not between them. The overall stability also comes from base stacking via hydrophobic interactions, but that stacking does not bind the strands together. Ionic bonds aren’t used for base pairing in DNA. So the bonds between the nitrogenous bases that bind the two strands are hydrogen bonds.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy