For fertilization to occur in humans, the sperm cells have a long journey to complete before reaching an egg. If a sperm reaches an egg, fertilization is still not complete. What events must happen for fertilization to be complete?
What will be an ideal response?
Once a sperm reaches an egg, the sperm must penetrate the protective covering surrounding the egg. Digestive enzymes in the acrosome will digest a path to the egg membrane, and the sperm pushes through using the flagellum. When the sperm contacts the egg, fusion of the cells' membranes must then occur, resulting in the sperm nucleus moving into the egg cytoplasm. The egg then completes meiosis II, which is followed by the fusion of the sperm nucleus with the egg nucleus. At this point, diploid zygote has formed and fertilization is now complete.
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Variation in taste is a product of combining signals from different categories of taste buds. What cell type is most likely to be involved in this integration?
A. supporting cells B. taste sensory neurons C. sensory microvilli D. interneurons
On which part of the carbon cycle have humans had the greatest impact?
A. return of CO2 to the atmosphere by oxidation of ancient organic matter B. capture of atmospheric CO2 by chemical weathering of rocks C. storage of CO2 through biomineralization in the oceans D. deposition of organic carbon in deep sea sediments E. All of the answer options have been greatly impacted by humans.
Non-native species can have important effects on biological communities by ________
A) preying upon native species only B) competing with native species for resources only C) reducing biodiversity only D) All of these are effects that non-native species can have on biological communities.
From where do the extra membranes arise in mitochondria, chloroplasts, and apicoplasts?
What will be an ideal response?