Whereas the zygotes of charophytes may remain within maternal tissues during their initial development, one should not expect to observe
A) any nutrients from maternal tissues being used by the zygotes.
B) specialized placental transfer cells surrounding the zygotes.
C) the zygotes undergoing nuclear division.
D) mitochondria in the maternal tissues, or in the tissues of the zygotes.
E) the zygotes digested by enzymes from maternal lysosomes.
Ans: B) specialized placental transfer cells surrounding the zygotes.
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Four of the five answers listed below are
characteristics of cnidarians. Select the EXCEPTION.
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Methicillin inhibits cell wall production. Why does this make it an effective antibiotic?
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There was a mass extinction of plants and animals at the end of the Permian period. Which of the following would be a reasonable prediction for the fungal fossil record?
A. There should be a massive increase in saprophytic fossils during the extinction, and then a massive decline shortly after the extinction was complete. B. There should be a slow increase in all fungal fossils during the time that plant and animal species declined, with their numbers staying relatively high afterward since there was little competition from other species. C. There should be a massive decrease in all fungal fossilsat the same time that plant and animal species started to decline, and the number of these fossils should remain low throughout the extinction period D. There should be a massive increase in mycorrhizal fossils during the extinction and afterward.
Which of the following statements concerning genital warts is FALSE?
A. They can be transmitted via fomites. B. They can travel to different locations on the same individual by autoinoculation. C. They can be sexually transmitted. D. The virus may remain latent and cause lesions at a later time. E. The incidence is relatively low because treatment is available.