An r-selected species typically
A) offers considerable parental care to a small number of offspring.
B) has an advantage in habitats that experience unpredictable disturbances.
C) is large-bodied, long-lived, and limited by density-dependent factors.
D) has an advantage in habitats that experience stable climates.
Answer: B
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In tobacco tissue culture, getting both roots and shoots to develop requires
a. an auxin-to-cytokinin ratio of 10:1. b. a higher concentration of cytokinin than auxin. c. an auxin-to-cytokinin ratio of slightly greater than 10:1. d. an intermediate auxin-to-cytokinin ratio. e. exactly equal amounts of auxin and cytokinin.
Which of the following statements about Chlamydia is incorrect?
A. Reticulate bodies differentiate into elementary bodies. B. It is an obligate parasite that needs host cells for growth. C. It is gram-negative. D. Elementary bodies are the infectious form. E. Elementary bodies lack enzyme systems for making ATP.
Blanks “A” and “B” should be labeled respectively
a. does not drink; loss b. does not drink; gain c. drinks; loss d. drinks; gain e. none of these
Discuss the necessity and benefits of the Genetic Information Nondiscrimination Act (GINA) of 2008. What will be an ideal response?