The common ancestor that produced the most evolutionary recent derived characters is
A. 12
B. 8
C. 9
D. 6
Answer: D
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The differences in male and female secondary sexual traits are due to the _____
a. relative proportion of sex steroid hormones in males vs. females b. production of different sex steroid hormones by males and females c. differences in sex steroid hormone receptors in males vs. females d. exposure to environmental toxins during fetal development e. absence of sex steroid hormones in females
Macroevolution is change among
a. groups of species. b. individuals of one species. c. individuals of several species. d. groups of populations. e. groups of individuals of several populations.
Which of the following phrases reflects an effective treatment of biofilms?
A. Interrupt quorum-sensing pathways, preventing signaling between cells B. Pre-treat with newly-discovered antimicrobials before exposure to established drugs C. Add DNase to the antibiotics to disrupt extracellular debris D. All of the above have been shown to enhance biofilm elimination.
The discovery of a coelacanth in South Africa in 1938 was surprising to biologists because it
A) was thought to be extinct. B) was a newly evolved species. C) represents a transition between two major groups of fishes. D) is the first species to have made the transition to land. E) has not evolved for more than 80 million years.