Animals most likely evolved most recently from ____.
A. colonial protists
B. fungi
C. amoebozoans
D. algae
E. cyanobacteria
Answer: A
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Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then which of the following statements about species W
and Y are true? I) Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies. II) Species W and Y have more genetic similarity with each other than either did with the other two species. III) Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations. A) Only I is correct. B) Only II is correct. C) Only III is correct. D) I, II, and III are correct.
Which scenario is an example of mechanical reproductive isolation?
a. two plants that bloom months apart b. two flowers that are pollinated by different insects c. two mammals that have different habitats d. two fish that have incompatible gametes e. two birds that have different mating rituals
Transcription takes place in three steps: initiation, elongation and termination
a. true b. false
After papaya seeds germinate, the hypocotyl elongates and forms a hook. This hook straightens and pulls the cotyledon and the shoot tip of the seedling into the air, leaving the seed coat in the soil. This method of embryonic shoot emergence is most similar to shoot emergence in which plant?
A. corn B. garden bean C. onion D. pea