Which step is not involved in the fertilization of angiosperm flowers?
A. Double fertilization produces an embryo and the endosperm.
B. Pollen is transported to a stigma of a flower.
C. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style.
D. The style of the pistil contracts to bring the sperm closer to the embryo sac.
E. The pollen tube grows until it reaches the ovule in the ovary.
Answer: D
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What three possible models were suggested to originally describe the nature of DNA replication?
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____________________ Indicate whether the statement is true or false.
Which of these is a source of lactose?
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