Which of the following is the only marsupial found in North America?

a.

opossum

b.

duckbilled platypus

c.

pseudoscorpion

d.

wood frog

Alexander Fleming discovered a type of that kills bacteria, which led to the development of Penicillin.

How does bacteria affect the nitrogen cycle?

In the trp operon, attenuation occurs through the recognition of two tryptophan codons in the leader sequence. what would happen if these two codons were mutated to stop codons? a. this operon will be insensitive to attenuation by tryptophan. b.

3) Houses with carpet are much quieter than houses with tile or hardwood floors because of sound wave

You are an anthropologist who has studied early hominin bones and concluded that there is a high degree of sexual dimorphism in body size in those species. what are the implications of your argument?

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.