A scientist suspects that the food in an ecosystem may have been contaminated with radioactive nitrogen over a period of months. Which of the following substances could be examined for radioactivity to test the hypothesis?

Which of the following statements about anabolic steroids is false?

Which of the following statements about pH is true?

Which of the following is dependent on the ability of water molecules to form hydrogen bonds with other molecules besides water?

Which of the following statements about the monomers and polymers found in living organisms is false?

Which of the following characteristics of a protein will remain intact if the protein is denatured?

Lactose intolerance is the inability to

How will a lower ocean pH caused by ocean acidification affect coral reefs?

Which of the following statements about radioactive isotopes is true?

The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?