Why does the inside of an apple turn brown?

Why does the inside of an apple turn brown?

When an apple is cut (or bruised), oxygen is introduced into the injured plant tissue. When oxygen is present in cells, polyphenol oxidase (PPO) enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colorless precursors to brown-colored secondary products.

Do otters hold hands when they sleep?

Otters are known to hold hands in groups – called a raft – while they eat, sleep and rest, to prevent families losing each other. The furry animals, the largest member of the weasel family, are even known to wrap sea plants around them to secure the bond.

How many Stephen King books are there?

King has published fifty novels, including seven under the pen name Richard Bachman, and five non-fiction books. He has written nearly two hundred short stories, most of which have been collected in nine collections of short fiction. Many of his stories are set in his home state of Maine.

Can fish change their gender?

Clownfish, wrasses, moray eels, gobies and other fish species are known to change sex, including reproductive functions. A school of clownfish is always built into a hierarchy with a female fish at the top. When she dies, the most dominant male changes sex and takes her place.

Do dogs get cavities in their teeth?

Pets, like their human owners, can get cavities. However, cavities are relatively rare in dogs because dogs’ diets generally are not high in decay-causing sugars. Veterinary dental experts have noticed a mild rise in the incidence of cavities among dogs fed sugary treats.

When was the first motion picture with sound?

Vitaphone, as this system was now called, was publicly introduced on August 6, 1926, with the premiere of Don Juan; the first feature-length movie to employ a synchronized sound system of any type throughout, its soundtrack contained a musical score and added sound effects, but no recorded dialogue—in other words, it had been staged and shot as a silent film.

Is olive oil flammable?

Extra-virgin olive oil ought to be flammable enough to keep an oil lamp burning. It will also burn without producing any noticeable smoke. So, if your olive oil will not keep a wick lit (or if it can, but produces a lot of smoke), you can trust that it is fake olive oil. However, other oils can keep a wick lit, too.

What year were the hippies?

It has been estimated that 100,000 people travelled to San Francisco during the summer of 1967. The media followed the movement of the hippies casting a spotlight on the Haight-Ashbury district where many of the psychedelic bands lived and played.