Figure 16.14 A series of reconstructions
of the drifting continents.
The continents of South America and Africa separated around ______ .
1.65 mya
2.150 mya
3.C200 mya
4.C240 mya
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Which of the following contribute to the spread of antibiotic resistance through bacterial populations?
A. horizontal gene transfer B. conjugation C. overuse of antibiotics D. transposons E. All of these choices are correct.
Which of the following is LEAST likely involved in calcium signaling?
A. IP3 B. calmodulin C. protein kinase A D. protein kinase C E. phospolipase C
What kind of fruit is formed from fused ovaries of several individually pollinated flowers?
a. aggregate b. simple c. multiple d. accessory e. berries
When is the root-shoot axis established in the flowering plant Arabidopsis?
a. within hours after the seed germinates b. shortly after the eight-cell embryo stage c. during the torpedo stage of embryonic development d. by the first cell division of the embryo