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Elina [12.6K]
3 years ago
14

Why do scientists think that RNA may have evolved before DNA?

Biology
1 answer:
Sidana [21]3 years ago
6 0

Answer:

RNA was the first molecule of heredity before DNA came onto the scene.

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Which tissues receive stimuli and conduct impulses or electrical signals in the body?
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I am pretty sure that the tissues which  receive stimuli and conduct impulses or electrical signals in the body are being shown in the option : Nerve tissues. I choose this one because, according to the definition of nerve tissue, this is <span>the main tissue component which perform all the listed processes.
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3 years ago
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Which of the following lists steps of mRNA production in eukaryotes in the correct order?A) 5' cap addition, addition of poly-A
Assoli18 [71]

Answer:

The correct answer is B) Transcription, 5' cap addition, addition of poly-A tail, exon splicing, passage through nuclear membrane.

Explanation:

The transcription process in eukaryotes takes place in the nucleus of the cell and after transcription post-transcriptional modification also takes place in the nucleus which is necessary to guide the mRNA out of the nucleus.

First, the process of transcription takes place in which DNA is transcribed to mRNA by an enzyme called RNA polymerase. After transcription post-transcriptional modifications takes place in the given order.

1. Capping: In capping process 7-methylguanosine is added by capping enzyme at 5' end of mRNA.

2. Polyadenylation: In polyadenylation, many poly-A residues are added at the 3' end of the mRNA called the poly-A tail.

3. Intron splicing: Introns are the non-coding sequence present in mRNA which are spliced out of mRNA and all exons are joined together.

After these post-transcriptional process, the mature mRNA is transported out of the nucleus through the nuclear membrane.

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3 years ago
If there are 46 chromosomes in a human cell, each with an average of of 5cm uncoiled length, estimate the length of DNA containe
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Answer:

length would be 230 uncoiled

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3 years ago
What is the definition of first Generation plants?
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Can the need to protect the elephants environment be balanced with the need to protect the elephant
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there are times when your need to save elephant they balance life also so yes save elephants

Explanation:

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