Biology, 25.09.2019 06:30 annajquinterov

What is suggested by the similarity of early embryos of different species of vertebrates?

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Biology, 22.06.2019 00:30, quigley523

What was the land like over 500 million years ago? what was under the sea?

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Biology, 22.06.2019 02:50, mccay5016987

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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Biology, 22.06.2019 08:00, paulat

Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.

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Biology, 22.06.2019 09:00, faizanaj1192

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?