What happens to DNA during S phase

In living systems molecules involved in hydrogen bonding almost always contain either oxygen or nitrogen or both. how do you explain this phenomenon?

Granite is a type of igneous rock. What determines the size of the crystals that form in a sample of granite? A. how many impurities are in the granite B. how quickly the rock cooled C. how large the sample is D.

Different finch species have beaks of different shapes and sizes. these different beak structures are evidence of

Curtis is a healthy man who is 32 years of age. using this information, calculate his approximate target heart rate zone for moderate-intensity physical activity.

What do white blood cells do in the immune system and how are they related to exocytosis?

Which statement best illustrates that problem solving can create new medical devices? Robert Hooke was in charge of verifying the information that was sent to the Royal academy.

A logical interpretation based on observations

Which layer of Earth acts as a very effective "insulator," because it's made of rock?

A mother brings her three-year-old daughter to her pediatric office stating that the girl has had fever and chills for three days. the girl also has a large, intensely red patch with a distinct margin on her leg and a nearby swollen lymph node.

Why is it necessary for the genetic material in a cell to exist in chromatin form during normal cellular activity, and not in chromosome form?