Avery's experiments showed that bacteria are transformed by “transforming principle” – DNA.
When Griffit in his experiments showed that R-strain bacteria (non-virulent) could be transformed by the heat-killed S bacteria, and become virulent, scientists assumed that there is some kind of “transforming principle” that is involved.
Avery and his colleagues cultured heat-killed S cells and tried t separate cellular components that could possibly be that “transforming principle”. Molecule of DNA gave positive result in a chemical test and also when enzymes able to degrade DNA were introduced, the transforming activity was eliminated.
Answer: mitochondria
Cyanide binds with at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the bound cyanide is likely to be localized within the mitochondria
Explanation:
Once cyanide ion (CN-) enters the tissues, it gets into the cell mitochondria and binds tightly with cytochrome oxidase, leading to the cessation of transfer of electrons to oxygen. This then makes the electron carriers accumulate in their reduced state, and the generation of high energy phosphate stops.
Thus, the effect of bound cyanide in mitochondria is oxygen deprivation.
Answer:
Control environment having no fish, seal or squid only sea otter.
Explanation:
If a killer whale is present in the control environment means no food except sea otter so we can see a decrease in the population of sea otter because the killer whale feed on it. If a killer whale has more food available in the form of fish, squid and seal etc so they will not feed on sea otter and their population will be increasing with the passage of time but when the killer whale is present in an environment which has no fish, squid and seal etc to eat so they feed on the sea otter to survive and as a result the population of sea otter decline.
The term Southern Oscillation most nearly refers to a reversal of wind direction
Answer: Option D
<u>Explanation:
</u>
Southern Oscillation, a component of the atmosphere in one large-scale interaction called El Niño / ENSO. The equatorial cycle fluctuates after irregular periods of about many years in response to alter in atmospheric pressure in the tropical Indo-Pacific.
With the weakening of the east-west wind during the southern oscillation phase, warm water may slide back west, increasing the flow of the equator up. Surface water temperatures and sea levels fall west and rise east, which is why this event is called El Niño.
<span>Climate describes the average conditions and
atmospheric patterns of a region over time. In describing the climate of a region one may specifically include precipitation, humidity, temperature, sunshine, wind velocity, fog, frost, and hail storms that have been observed for a long period of time.
The average weather statistics for determining a region's climate is in a span of 30 years. Scientists must make observations within a specified interval to determine the climate of a particular location. </span>
