Free fetal DNA (ffDNA) originates from the breakdown of fetal cells and their nuclei in the ____________________.Fill in the blank(s) with the appropriate word(s)
amniotic fluid
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Which of the following statements accurately describes the role of insects in early angiosperm evolution?
A. Insect pollination may have allowed early angiosperms to thrive in the understory habitats of tropical rain forests. B. Insect pollination may have allowed early angiosperms to thrive in the canopy of tropical rain forests. C. Mammal pollination may have contributed to early angiosperm success. D. Very few living members of the earliest angiosperm lineages produce flowers that are visited by insects. E. Insects did not play a significant role in early angiosperm evolution.
Gliding motility can be used to propel bacteria ________.
A. along the framework of the cytoskeleton of host cells B. through the air only C. through liquids only D. across solid substrates only
The stable presence of more than one allele for a particular gene in a population is called
a. balanced polymorphism. b. mixed gene pool. c. mutation pressure. d. genetic drift. e. competition.
Which of the following is a deuterostome phylum?
a. Arthropoda b. Echinodermata c. Porifera d. Platyhelminthes e. Annelida