Members of the Porifera phylum have

a. no skeleton.

b. an exoskeleton.

c. an endoskeleton.

d. either an exoskeleton or endoskeleton, depending on the species.

Which of the following vitamins is used to construct the coenzymes NADH and NADPH? a. Riboflavin b. Panthothenic acid c. Vitamin B12 d. Niacin

A force is a ___ quantity. -scalar -victor -diagonal

A change in the genetic code of an organism is called A) cancer. Eliminate B) mitosis. C) mutation. D) tumor.

Herceptin, a drug developed by the biotechnology industry, is used to treat breast cancer. It is taken only after a patient undergoes a matching diagnostic test. In this way, the drug is only give to those patients who have a certain protein.

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

At what pint in the cell cycle do cells begin to divide uncontrollably

Is produced along with water at the end of normal cellular respiration?

Stimulation of a cell by a molecule that the cell itself makes is called stimulation

From the producer level to which level does energy flow directly? A. decomposer B. tertiary consumer C. secondary consumer D. primary consumer

What motion will result from two forces acting on an object : one forcee of 50 newtons to the east, the other a force of 30 newtons to the west? The object will-