A former patient calls, hoping to locate x-rays taken more than five years ago. What should you say?
What will be an ideal response?
Answer:
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The time it takes for half of a quantity of a radioisotope to decay into a more stable isotope is
a. the same for all elements. b. decay time. c. half-life. d. disintegration time. e. dependent on temperature.
The roots of monocots are generally ________, whereas the roots of dicots are generally ________
A) thick taproots; thin and fibrous B) spread out laterally; deep C) deep; spread out laterally D) covered in root hairs; lacking root hairs
Gregor Mendel's pioneering genetic experiments with pea plants occurred before the discovery of the structure and function of chromosomes. Which of the following observations about inheritance in pea plants could be explained only after the discovery that genes may be linked on a chromosome?
(A) Pea color and pea shape display independent inheritance patterns. (B) Offspring of a given cross show all possible combinations of traits in equal proportions. (C) Most offspring of a given cross have a combination of traits that is identical to that of either one parent or the other. (D) Recessive phenotypes can skip a generation, showing up only in the parental and F2 generations.
Which of the following organisms is helping scientists better understand the evolution of the immune system because they have a unique feature during their lifecycle?
A. planaria B. archaea C. cellular slime molds D. B cells E. viruses