Which of the following is TRUE of the testes?
A. The testes move away from the body in a cold environment.
B. The testes are endocrine glands.
C. The testes move closer to the body in a hot environment.
D. The testes are analogous to the clitoris
B. The testes are endocrine glands.
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Which statement concerning root hairs is not correct?
A. Root hairs are tubular extensions of individual epidermal cells. B. A root hair is isolated from its epidermal cell with a cross wall. C. Root hairs generally live only a few days before being sloughed off. D. Root hairs increase the absorption of water and minerals. E. Root hairs are located in the zone of maturation of a root.
In order to dislodge food that has accidentally entered the trachea, which procedure is used?
a. the Ortolani maneuver. b. the Herbert maneuver. c. the Heimlich maneuver. d. the Bartholin maneuver. e. the Feingold maneuver.
The following are steps involved in producing recombinant DNA using human DNA and a plasmid. Which one of the following answers best reflects the proper order of these steps?
1. select bacteria that contain human DNA 2. isolate and purify DNA to be recombined 3. add DNA ligase to join human DNA with plasmid 4. cut human DNA and plasmid with restriction enzyme 5. introduce new plasmid to bacteria A) 4, 1, 5, 3, 2 B) 2, 4, 3, 5, 1 C) 2, 5, 1, 3, 4 D) 4, 3, 2, 1, 5 E) 5, 1, 2, 4, 3
In acidic soils or in habitats subjected to prolonged acid rain, what element is often released from rocks that is toxic to many plants?
A. selenium B. iron C. molybdenum D. chlorine E. aluminum