Describe the function of the root hairs
What will be an ideal response?
Root hairs greatly increase the effective surface area of the root, important in facilitating uptake of both water and dissolved minerals. Water typically diffuses into the epidermal root hair, then follows a different pathway to reach the xylem in the center of the root.
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To approach females, male spiders plug the web of the female to alert her to their presence
and to communicate that they are a potential mate rather than a prey item. This type of communication involves __________.
a. mechanoreceptors b. a cochlea c. depth perception d. pheromones
Eutrophication can lead to
a. an algal bloom. b. fish congregations. c. decreased water clarity. d. slow plant growth rates. e. a and c only.
What is an advantage of using the lac regulatory region to control the expression of exogenous proteins in bacterial cells?
A) Expression can be controlled by the addition of an inducer to the media. B) This regulatory region functions in both bacterial and mammalian cells. C) By using this regulatory region, eukaryotic genomic DNA can be expressed in bacterial cells. D) Host regulatory mechanisms are not effective when this regulatory region is cloned into a plasmid.
Which of the following statements about the Malpighian tubules is false?
a. Water and some solutes are transported into the Malpighian tubules via active transport. b. The Malpighian tubules empty into the gut of the insect. c. Water, some salts, and other solutes are reabsorbed into the hemolymph in the rectum. d. The excretory system of an insect may contain up to several hundred Malpighian tubules. e. The blind ends of the Malpighian tubules are bathed in hemolymph.