What are two important factors that determine whether or not molecules pass through?

Why is a cells DNA like the books in a library

A pyramid of energy has 100 units of energy available for the first traffic level. How many units would be available for primary consumers? How did you calculate this?

What are the stages of protein synthesis and where does each stage take place?

Which would be least likely to pollute water with heavy metals

What process copies a sequence of dna nucleotides into a complementary sequence of rna nucleotides?

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.

What job does each organelle do in a cell?

Which of the following statements is true of an object composed of a single cell? It could be considered living only if it has some of the other characteristics of life. It is a living thing. It is not a living thing. It could become a living thing.