Cells grown in laboratory culture dishes undergo only a fixed number of division before dying. The number of possible divisions drops depending on the age of the donor organism. This phenomenon is called the

Which of the following statements about minerals is false? A. Minerals reflect light in different ways. B. The color of a mineral's powder doesn't change. C. The densities of many minerals are quite similar. D. A mineral can break in only one way.

Which of the following is one observation that darwin made as he developed his theory of natural selection? a. fish, such as salmon, lay few eggs but produce many offspring. b. fish, such as salmon, never produce offspring. c.

Advantages of photo tropism

In pea plants, the allele for tall plants is dominant to the allele for short plants. If a homozygous tall plant is crossed with a homozygous short plant, what percent of their second generation of offspring would you expect to be short?

Only the most violent volcanic eruptions feature A. magma B. pyroclastic flow c. tephra D. cinder cones

Many planets are formed by a process called accretion, where chunks of material are drawn to bigger chunks of material and are slammed together until enough material has been gathered to produce a planet.

A scientist plans to cut a segment of DNA so that it can be inserted into the DNA of a bacterium, a single celled organism. This scientist needs to use a special type of organic molecule to perform this cutting process. This molecule is

Which sequence of terms best summarizes Darwins Theory of Natural Selection?

What happens to a population if its growth exceeds its carrying capacity? A. It starts to grow exponentially. B. It starts to grow logistically. C. It stops growing. D. It declines slowly. D. It crashes.

Which two phases are gibbous moons?