Answer:
The correct answer is B. the two strands of DNA must separate.
Explanation:
DNA is a double-stranded structure. The two strands are joined together by the formation of hydrogen bonds between complementary nucleotides. So before the replication takes place these two strands must be separated.
The separation of DNA strand is accomplished by the action of a helicase enzyme which breaks the hydrogen bond between complementary nucleotides and separated the two DNA strands.
After separation, the DNA polymerase binds to separated DNA and replicating the DNA. So the right answer is B.
Irieirirkekeksksekekekekdjdjdjdkdkskdkdjdj
Answer:
Explanation:
Positive phototropism is growth toward a light source, and negative phototropism is growth away from a light source. ... Sunflowers are a great example of positive phototropism, because not only do their stems curve toward the light but their flowers turn to face the sunlight as well.
The age of the earth can however be derived from prior knowledge of the age of the Canyon Diablo meteorite.
<h3>What is Age?</h3>
This is defined as the length of time during which a being or thing has existed.
The fragment of the Canyon Diablo meteorite determined the elements that formed as radioactive uranium decayed over billions of years.
Read more about Age here brainly.com/question/24774411
