Alloploidy provides a mechanism for slow speciation
________ Indicate whether the statement is true or false.
F, rapid
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Plant cells called ____ make up the bulk of the soft primary growth of roots, stems, leaves, flowers,
and fruits.
a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members
Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms were in place. Angiosperms make up 95% of all modern plant species. Which of the following may help explain the rapid success of angiosperms?
a. Use of the wind to disperse pollen and seeds b. Flowers and fruits help protect and disperse both pollen and seeds c. Use of the wind to disperse spores d. Use of water to disperse pollen and seeds e. Animals eating the plants helped to disperse both pollen and seeds
What proteins, working in series, catalyze the reactions of the citric acid cycle?
What will be an ideal response?
In eukaryotic cells, transcription cannot begin until
A. several transcription factors have bound to the promoter. B. the 5' caps are removed from the mRNA. C. DNA nucleases have isolated the transcription unit. D. the two DNA strands have completely separated and exposed the promoter. E. the DNA introns are removed from the template.