What Is the Basis for the Difference in How the Leading

question 42

Multiple Choice

What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesised?

• A) The origins of replication occur only at the 5′ end.
• B) Helicases and single-strand binding proteins work at the 5′ end.
• C) DNA polymerase can join new nucleotides only to the 3′ end of a pre-existing strand, and the strands are antiparallel.
• D) DNA ligase works only in the 3′ → 5′ direction.

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Defensive Alliance

An agreement between nations to provide mutual support in case one of them is attacked by another country.

NATO

The North Atlantic Treaty Organization, a military alliance established in 1949 between North American and European countries to provide collective security against aggression.

Warsaw

The capital and largest city of Poland, known for its historical significance, cultural heritage, and as a symbol of Polish national identity.

Détente

A period of improved relations between the United States and the Soviet Union during the Cold War, beginning in the late 1960s.