Which of the following is a major principle upon which cell theory is based? A All cells form by free-cell formation. B All cells have DNA. C All organisms are made of cells. D All cells are eukaryotic.

Members of two different species possess a similar-looking structure that they use in a similar way to perform about the same function.

For each of earth's four spheres, describe one way that the water cycle affects the sphere

What happens to cells that have lower concentrations of salts inside their cells and a higher concentration of salts in the surrounding water?

Suggest reasons for using synthetic forms of drugs rather than using plant extracts directly

What are some ways that bacteria are useful in the world today? (Choose all that apply) to develop new medicines to fight diseases to study a wide range of illnesses to clean up oil spills to cause illnesses and infections in humans

4. During what phase do centrioles begin to migrate to opposite poles of the cell?

Are made of long chains of amino acids

Maria is testing the behavior of monkeys. First, she shows the monkey a rectangle. Then she shows the monkey a rectangle and a cylinder. If the monkey pushes aside the rectangle, Maria gives the monkey a food reward.

Why is the phloem in a leaf important to the roots of a plant? A. It provides the roots with carbohydrates. B. It provides the roots with nutrients from the soil. C. It transports water to the leaves from the roots. D.

A mutation causing an addition or a deletion of one base pair resulted in the production of a nonfunctional mutant protein. The sequences of the normal and mutant proteins are given below.