Imagine that a biologist discovers a new species of green algae that has a cuticle-like waxy coating and some rudimentary structures for containing and protecting the gametes. These clues suggest that the new species is very similar to the direct ancestors of the land plants. Where would such a find most likely occur?
A. a lakeshore or marsh with water levels that rise and fall frequently
B. mats of algae that hang near the ocean's surface, similar to the floating seaweed mats seen in the Sargasso Sea
C. in a deep, cold mountain lake with a very stable water level
D. a deep-sea hydrothermal vent community

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.

How do the evolutionary chart and the video support the claim that all living things are made up of cells?