Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success?
A) 50% success: 100 pollen grains grew to 50 ovules, and double fertilization occurred.
B) 50% success: evidently, only 50 sperm pollinated 50 anthers.
C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei.
D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei.
D
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A Pasteur flask has a(n)
A) swan neck to prevent particulate matter from getting into the main body of the flask. B) double neck so two substances may be added at the same time. C) secondary opening at the base to allow for drainage. D) inverted upper edge to prevent spillage while swirling.
In the life cycles of mosses and ferns, which of the following structures are diploid (2n)? Select all correct choices
A. sporophyte B. gametophyte C. zygote D. sperm E. eggs
A thymidine dimer is encountered during replication. What types of repair may occur?
What will be an ideal response?
A parent cell of a certain organism has 16 chromosomes and undergoes meiosis. The resulting cells will have how many chromosomes?
a. 64 b. 32 c. 16 d. 8 e. 4