Which describes the type of bond formed when a group 1 element bonds with an element from group 17? a. the group 1 element transfers an electron from its outer shell to the outer shell of the group 17 element, forming an ionic bond. b. the group 1 element accepts an electron into its outer shell from the outer shell of the group 17 element, forming an ionic bond. c. the group 1 element shares an electron from its outer shell with the outer shell of the group 17 element, forming a covalent bond. d. the group 1 element transfers an electron from its outer shell to the outer shell of the group 17 element, forming a covalent bond.

Describe two recent or ongoing space missions.

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?

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