An important role of the hormone oxytocin in reproduction is that it stimulates
A. meiosis.
B. ovulation.
C. implantation of the embryo.
D. development of the fetal heart.
E. contraction of uterine muscles during childbirth.
E
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A researcher knows that bacteria are much more prevalent in the seawater at the ocean's surface, compared to thaumarchaeotes. How does the ratio of bacteria to thaumarchaeotes compare at lower depths (5000 meters under the ocean's surface)?
A. Bacteria are still much more prevalent. B. Thaumarchaeotes are much more prevalent. C. There are roughly equal numbers of bacteria and thaumarchaeotes. D. Neither bacteria nor thaumarchaeotes can survive at that ocean depth.
How is karyogamy different from plasmogamy?
A. Karyogamy is the fusion of nuclei, whereas plasmogamy is the fusion of cytoplasm. B. Karyogamy is the fusion of cytoplasm, whereas karyogramy is the fusion of nuclei. C. Karyogamy produces heterokaryotes and plasmogamy produces zygotes. D. Karyogamy produces dikaryotic cells, whereas plasmogamy produces diploid cells. E. Karyogamy involves meiosis, whereas plasmogamy involves mitosis.
This animal nurses its young, has forward
facing eyes, nails on its fingers and toes, and a moist nose. This animal is
a. a lemur. b. a tarsier. c. a bird. d. a new world monkey. e. more than one of these
Leaching is caused by
a. bacterial action. b. wind. c. water. d. microbial activity. e. none of these.