As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER—RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with:
A. Radioactive isotopes are atoms that are unstable and as a result emit energy in a process called radioactive decay.
B. Radioactive isotopes are atoms that are stable and as a result emit energy in a process called radioactive decay.
C. Radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures.
D. Radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical process will remain intact and pose no problems.
A
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Recognizing pathogens that contain multiple unique proteins which enable the human immune system to recognize just one and mount an effective response has opened the door on development of some vaccines only being
A) attenuated carrier viruses. B) monovalent. C) subunit vaccines. D) purified protein administered.
Water levels are adjusted to meet the osmoregulatory needs of the organism in the _____ of the nephron under the control of _____, also called vasopressin
A. distal convoluted tubule; antidiuretic hormone B. loops of Henle; antidiuretic hormone C. collecting ducts; antidiuretic hormone D. distal convoluted tubule; diuretic hormone E. collecting ducts; diuretic hormone
Which of the following statements is NOT true about
asteroids? a. They have had little influence on the history of life. b. They do not emit light and are difficult to see. c. Their impacts have produced craters visible in satellite images. d. One asteroid impacted our planet just prior to the mass extinctions at the K-T boundary. e. An asteroid impact releases an enormous quantity of energy.
The 8,000 species in this group have countless rows of cilia.
A. cellular slime molds B. water molds C. plasmodial slime molds D. ciliates