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wel
3 years ago
13

How can you tell the substances melting point by looking at a graph?

Biology
1 answer:
alex41 [277]3 years ago
4 0

On a graph of temperature vs. time, it shows pure substances exhibit a sharp boiling point and a sharp melting point as a horizontal flat line wherein the temperature does not change over time up until all the pure substances boiled or melted. The temperature stays stable at 160°C between 4 minutes and 11 minutes. This horizontal flat line part of the graph is normal of a pure substance. The melting point of a solid substance is usually used to specified if the substance is pure. Likewise, the boiling point of a "liquid" substance can be used to specify if the substance is pure as well.

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Why does transcription occur in the nucleus and not in the cytoplasm in eukaryotes?
pav-90 [236]
Transcription is the process by which the DNA molecule makes an RNA molecule using enzyme RNA polymerase and other proteins. The mRNA is then used to generate proteins by a process called translation which occurs in the cytoplasm. Transcription occurs in the nucleus because DNA cannot leave the nucleus.
3 0
3 years ago
The number of ducks in a pond is equal to the square root of the number of fish, and the number of turtles is equal to the cube
brilliants [131]

Answer:

There are 64 fish, 8 ducks and 4 turtles.

Explanation:

From the question, there can be from 2 to 99 fish in the pond. However, there cannot be fractions in the number of fish, ducks or turtles. Hence, the number of fish must have both of a perfect square and perfect cube. The perfect squares from 2 to 99 are 4, 9, 16, 25, 36, 49, 64 and 81. The perfect cubes from 2 to 99 are 8, 27 and 64. Since only 64 fits both criteria, the number of fish is 64. The number of ducks is the square root of number of fish, which is the square root of 64. The square root of 64 can be either positive 8 or negative 8. However, there cannot be negative numbers, so there are 8 ducks in total. The number of turtles is the cube root of the number of fish, which is the cube root of 64 and it is 4.

7 0
2 years ago
You have been asked to participate in the cleanup of an old mining site. You build a treatment wetland to clean up a contaminate
ycow [4]

Answer:

b) Bioremediation

Explanation:

The use of natural occuring or intentionally introduced micoorganisms to treat environmental pollutants is called as Bioremediation.

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  • The natural degradation process of pollutants is improved by bioremediation.
  • Green plant, Decomposers and their enzymes are used in bioremediation to imrprove the condition of the environment.

7 0
3 years ago
Read the Mungo Lady and Mungo Man Do others in the field of anthropology agree with Dr. Thorne's view? Explain.
sweet [91]
I've read the story back a couple months ago

Actually, there are many archeologists and anthropologists disagree with dr. Thorne's view. Basically, Thorne strongly believes that what many calls Homo erectus was, in fact, Homo sapiens, and that they migrated out of Africa almost 2 million years ago and dispersed throughout Europe and Asia. That would actually be very different from what scientists have always believed about the evolution of the species. That is why many of them are against him)

I hope I helped :)

5 0
3 years ago
Read 2 more answers
Which of the following is not a central theme of biology? Evolution, The study of genetics, Cell theory or The study of chemical
Dmitriy789 [7]
The study of chemical reactions would be in chemistry and not biology so thats the answer
8 0
3 years ago
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