The ____ tissue system is made up of interconnecting cells that form transport channels throughout the plant
a. ground
b. organ
c. vascular
d. dermal
e. xylem
ANSWER: c
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After allowing phages grown with bacteria in a medium that contained 32P and 35S, Hershey and Chase used a centrifuge to separate the phage ghosts from the infected cell. They then examined the infected cells and found that they contained _____, which demonstrated that _____ is the phage's genetic material.
Fill in the blank(s) with the appropriate word(s).
Intercalated discs are cell-cell junctions found between cardiac muscle cells. One feature of these intercalated discs is that they contain a large number of gap junctions, which means that _____
A) an extension of smooth endoplasmic reticulum goes through the gap junction, making it continuous from one cardiac muscle cell to the next B) water ions and small molecules can readily pass from one cardiac muscle cell to the next C) cardiac cells can function independently when necessary D) RNA from one cardiac muscle cell can be transported into an adjacent cell through the gap junction
Which of the following alternate hypotheses could explain Yoel's results that on some islands, green anole lizards live higher in the trees and have larger toe pads?
A. The introduction of a predator that lives on the ground caused the green anole lizard population to evolve. B. An increase in the amount of food available on the ground caused the green anole lizard population to evolve. C. A decrease in the temperature caused the green anole lizard population to evolve.
A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prions conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins. B. The shape change could block the translation of scrapie RNA. C. The shape change could stop the replication of scrapie DNA. D. The shape change could stop the transcription of scrapie RNA. E. The shape change could induce scrapie protease activity.