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Bond [772]
3 years ago
15

An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What’s one advantage

of using electromagnets in devices?
A. Electromagnets have a strong, constant magnetic field.
B.Electromagnets are more powerful than permanent magnets.
C.Electromagnets don’t need a source of electricity to work.
D.Electromagnets can easily be turned on and off.
Biology
2 answers:
denis23 [38]3 years ago
7 0
D they are easily contained charges so on and off is no problemo
Ivenika [448]3 years ago
4 0

Answer:

D.Electromagnets can easily be turned on and off.

Explanation:

An electromagnet is a device which moving electric charges(current) in a coil of wire create a magnet. Electromagnets can easily be turned off and on because it is a electromagnet. When current flows through a wire, a magnetic field is produced around a wire and create an electromagnet. The coils are always made of copper wire because copper is a good conductor of electricity.

Advantage of using electromagnetic devices:

Electromagnet over a permanent magnet: It is the magnetic field can be sudden changed by the controlling the amount of electric current in winding. It needs no power, an electromagnet needs continuous supply of current to maintain the magnetic field.

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The answer is False. Nothing in an organism works in isolation
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3 years ago
Are RNAs processed before translation is able to occur in Prokaryotes? Do only mRNAs undergo processing and maturation in Eukary
raketka [301]

Answer: RNAs are not processed before translation in prokaryotes, this process only takes place in eukaryotes.

Explanation:

Messenger RNA or mRNA is a single-straded ribonucleic acid that transfers the genetic information from the DNA (deoxyribonucleic acid) molecule of the cell nucleus to a ribosome (which are the machinery responsible for protein synthesis) in the cytoplasm. mRNA determines the order in which the amino acids of a protein will be joined and acts as a template or pattern for the synthesis of that protein. To accomplish this, the DNA molecule must be transcribed into an RNA molecule, which is used for protein synthesis.

The messenger RNA obtained after transcription is known as primary transcribed RNA or precursor RNA or pre-mRNA, which in most cases is not released from the transcription complex in a fully active form, but in eukaryotes it must undergo modifications before it can perform its function (RNA processing or maturation). These modifications include:

  • Elimination of fragments (splicing): In most cases, the <u>mRNA undergoes the removal of internal, non-coding sequences called introns, and the connection of exons. This does not occur in prokaryotic cells</u>, as they do not have introns in their DNA.
  • Protection by CAP: <u>Addition to the 5' end of the structure called "cap" or "capping"</u>, which is a modified guanine nucleotide, 7-methylguanosine triphosphate, via a 5'-5' triphosphate linkage, instead of the usual 3',5'-phosphodiester linkage. This cap is necessary for the normal RNA translation process and to maintain its stability.
  • Polyadenylation signal: <u>Addition to the 3' end of a poly-A tail, a long polyadenylate sequence, whose bases are all adenine</u>. Its addition is mediated by a sequence or polyadenylation signal (AAAAAA), located 11-30 nucleotides upstream of the original 3' end. This tail protects the mRNA from degradation, and increases its half-life in the cytosol, so that more protein can be synthesized.

The mature mRNA (in eukaryotes) is transferred to the cytosol of the cell through pores in the nuclear envelope. Once in the cytoplasm, ribosomes are coupled to the mRNA. However, in prokaryotes, ribosome binding occurs while the mRNA strand is being synthesized. After a certain amount of time, the mRNA is degraded into its component nucleotides by ribonucleases. So, the transcription and translation processes are carried out in a similar way as in eukaryotic cells but they occur simultaneously. But, the fundamental difference is that, in prokaryotes, the messenger RNA does not undergo a maturation process and, therefore, no cap or tail is added and no introns are removed. Moreover, it does not have to leave the nucleus as in eukaryotes, because in prokaryotic cells there is no defined nucleus.

So, RNAs are not processed before translation in prokaryotes, this process only takes place in eukaryotes.

6 0
2 years ago
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Llana [10]

One useful point about the moment magnitude scale is that it is logarithmic, where each whole number represents a factor of 32. Therefore, the difference in two whole numbers of the magnitude means that an earthquake is 1,000 times stronger. For example, a 7.0 magnitude earthquake releases 1,000 times more energy than a 5.0 one.

4 0
3 years ago
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Nana76 [90]

Answer: The statement is true

Explanation:

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Hence, nature allows the traits that will help living organisms survive best in their environment to be passed down to new offsprings while it eliminates all other traits.

Thus, the statement is true

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dlinn [17]

The offspring could receive either D or d.

8 0
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