Which of the following protein categories facilitates the movement of ions and molecules across membranes?
A. regulatory proteins
B. protective proteins
C. transport proteins
D. cell-signaling proteins
E. motor proteins
C. transport proteins
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Which of the following has increased as a direct result of stratospheric ozone depletion?
a. CO2 b. UVB c. CFCs d. nitrous oxides e. sulfur oxides
Which of the following is NOT a cause of mutation?
Errors in DNA replication Errors during meiosis Exposure to radiation Exposure to tobacco All of the choices are causes of mutations
Endocrine glands secrete their products
A) into a synapse. B) into a gap junction. C) into ducts that open into a body cavity. D) into interstitial fluid. E) directly into target cells.
Describe the genetic material of a prokaryote.
A) DNA is arranged in several linear chromosomes. B) A circular piece of DNA is found in the nucleus. C) Prokaryotic chromosomes can be found in their mitochondria. D) Circular pieces of DNA are found in the cytoplasm. E) One long strand of DNA is found in the nucleus.