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Rudik [331]
2 years ago
12

5. Why are index fossils useful in dating rock layers?

Biology
1 answer:
mr Goodwill [35]2 years ago
8 0

Answer:

Fossils are used to determine the ages of rock layers.Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in.

Explanation:

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5. Why do cells need facilitated diffusion?
marusya05 [52]

It is transported against the concentration gradient by a dependent glucose symporter which provides a driving force to other glucose molecules in the cells. Facilitated diffusion helps in the release of accumulated glucose into the extracellular space adjacent to the blood capillary.

3 0
3 years ago
What might hershy and chase have concluded if they had found 35s instead of 35p in bacterial cells? Explain your answer
kaheart [24]

Hershey and chase have concluded that DNA is not protein it was the genetic material.

Explanation:

Hershey and chase said that DNA is not protein it was the genetic material. They took a direct physical approach in finding the genetic material. They both determined that a protective coat was formed around the bacteriophage.

The internal DNA is not a protein, a genetic material. They used label to find it. The lack of 32p labeled DNA remaining in solution after bacteriohages are allowed to absorb the bacteria showed tha DNA was transferred into the bacterial cell.

The radioactive 35s in the solution shows that protein coat protects the DNA before adsorption.

3 0
3 years ago
Read 2 more answers
Sergei Winogradsky Choose one: A. discovered microbial fermentation. B. developed a pure culturing system using agar. C. identif
NeX [460]

Answer:

D. Discovered chemolithotrophs in natural enviroments.

Explanation:

Sergei Winogradsky was a russian microbiologist. He observed in his research with genus of bacteria <em>Beggiatoa, </em>they were able to oxidize hydrogen sulfide as an energy source. Being the first example known of lithotrophs (organisms that use inorganic substrate in order to obtain energy).

7 0
2 years ago
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After Brian loses his third job in a year, his wife tells him that she wants a divorce. Brian becomes deeply discouraged, demons
solmaris [256]

Answer:

depression

Explanation:

i honestly don't mean this in a rude way, but the answer to this question should be pretty obvious. try to do your homework on your own, it will really pay off in the long run. believe me, midnight cramming for exams isn't the way to go :/

5 0
2 years ago
Are viruses considered to be cells? Why or why not
GuDViN [60]

Answer:

No, viruses are not considered cells as they're parasitic and can't live on their own. A virus has to infect living cells in order to survive, so it's not considered a cell.

7 0
2 years ago
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