Describe the process of double fertilization in flowering plants
What will be an ideal response?
Once the two sperm cells reach the egg sac, one haploid sperm nucleus fuses with the egg nucleus, forming the fertilized egg or zygote, which is diploid. The other haploid sperm nucleus fuses with the two nuclei that occupy the large central cell, and this forms the triploid endosperm. Endosperm contains starch that will later nourish the embryo within the seed. The zygote undergoes mitosis and forms the embryo, which later develops into the mature diploid plant.
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Which of the following RNAs use a Ran-independent pathway for the transport of RNA across the nuclear membrane?
A. mRNA B. tRNA C. rRNA D. snRNA E. miRNA
________ occurs when the concentration of pollutants gets higher as it passes to higher trophic levels
a. Trophic accumulation b. None of these choices c. Endocrine disruption d. Biological magnification
Contraction of the muscles surrounding an arteriole that decreased its diameter by 50% would
A. increase the resistance in the arteriole by approximately 50%. B. increase the resistance in the arteriole approximately 16-fold. C. not be expected to change resistance in the arteriole. D. decrease the resistance in the arteriole approximately 16-fold. E. decrease the resistance in the arteriole approximately 50%.
Since the pH of the female vagina is not suitable for the survival of sperm, secretions from the ________ gland of the male are a necessary component of semen to raise the pH
Fill in the blank(s) with correct word