Chemical cues that help guide a developing pollen tube toward an ovule are released by the
a. antipodal cells.
b. synergids.
c. egg.
d. central cell.
e. sperm.
B
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Which micronutrient is involved in photosynthesis?
a. molybdenum b. silicon c. sodium d. cobalt e. manganese
Which of the following is true of a dominant allele?
1.It is expressed over the recessive allele in the heterozygous condition. 2.It is more common than the recessive allele. 3.It produces a better trait than the recessive allele. 4.It will eventually replace the recessive allele.
How is the human genome able to encode billions of unique antibody molecules from only three gene sets? What will be an ideal response?
What does it mean if a plant is dioecious?
A. The sporophyte and the gametophyte are on the same plant. B. There are separate male and female sporophytes. C. Pollination and fertilization are separate events. D. There is double fertilization of the embryo.