Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactive isotopes were never detected in any samples containing just soil taken during the experiment. The finding implies that the
a. soil does not provide the ecosystem with minerals
b. isotopes were undetectable in very small amounts
c. isotopes were transported via vascular tissues
d. plants quickly return minerals to the soil in which they grow
e. soil speeds up radioactive decay
Answer: c. isotopes were transported via vascular tissues
You might also like to view...
Refer to the paragraph on the Venter et al. paper and the table above. As with many new endeavors, concerns have been raised by some that genomics will fundamentally change the way biological research is practiced
Examine the full citation for the Venter et al. paper and consider the way this work was done. Now think of some seminal works in the history of biology, for example, Darwin's On the Origin of Species and Watson and Crick's publication on DNA structure. What do you think the concern might be that has been voiced about genomics? A) Genomics will offer deep insights too rapidly for the biological community to comprehend. B) Genomics is so based in technology that it cannot possibly reveal important knowledge of biology. C) Genomics makes biology a "big-team science" that will squeeze out innovative individuals or small groups of scientists who traditionally have provided our greatest insights. D) Genomics is really computer science, not biology, and therefore offers little for understanding life.
Which of the following acronyms describes a technique used in chromosome painting?
A. RFLP B. VNTR C. STR D. FISH E. STS
Ovoviviparity is found in
A. reptiles. B. birds. C. mammals. D. mollies and guppies. E. marsupials.
Which of the following allows materials to diffuse
into body cells and allows organs to grow larger and move more freely? a. a coelom b. mesoderm c. a mantle d. a water-vascular system e. a saclike gut