As the number of angiosperm species rose, what happened to the number of species of most other groups of land plants?
A. They increased.
B. They decreased.
C. They stayed roughly the same.
B
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CDKs are protein kinases. They function to ____
a. add phosphate groups to target proteins b. check for the attachment of spindle fibers to chromosomes c. remove phosphate groups from cyclins d. arrest the cell cycle e. allow the cell cycle to work forward or backward
Which element does not contain a neutron in its nucleus?
a. helium b. carbon c. oxygen d. hydrogen e. nitrogen
Which is true regarding translation in bacteria?
A. Translation ends when the Shine-Dalgarno sequence is reached. B. The 70S ribosome is composed of a 20S and 50S subunit. C. Translation begins with formation of the 30S initiation complex. D. All of the choices are correct.
If a stem is cut, what will occur if the xylem sap is under tension?
A. Xylem sap will spurt out B. Xylem sap will stay at the cut surface C. Air will be pulled into the xylem D. The cut surface will form bubbles if placed under water