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SVETLANKA909090 [29]
2 years ago
13

The hypothesis that all species are descended from common ancestors was proposed by

Biology
1 answer:
MrRissso [65]2 years ago
6 0
The answer is Charles Darwin. He was the first to theorize evolution from a common ancestor.
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Classify each RNA post-transcription processing event according to whether it occurs in prokaryotes or eukaryotes.
tigry1 [53]

'RNA is transcribed and translated in the cytoplasm', 'transcription produces an mRNA ready for translation' and 'RNA is proofread for errors' occur in prokaryotes, whereas '5′ cap, 3' poly-(A) tail and RNA splicing' occur in eukaryotes.

The prokaryotic cells (e.g., bacterial cells) do not contain cell nuclei, thereby the messenger RNA (mRNA) must be transcribed and translated in the cytoplasm.

During prokaryotic transcription, the RNA transcript is proofread for errors. In bacteria, DNA polymerases proofread the transcript by using their 3’ → 5’ exonuclease activity.

In eukaryotic cells, RNA processing consists of several mechanisms:

  • A 7-methylguanosine cap (5′ cap) is added to the 5′ end of the precursor messenger RNA (pre-mRNA).

  • A 3' poly-Adenine (A) tail is added to the 3' end of the pre-mRNA.

  • Both the 5′ cap and 3' poly-(A) tail protect the RNA transcript from its degradation by exonucleases.

  • Eukaryotic RNA splicing consists of the removal of non-coding regions called 'introns' and subsequent splicing of the protein-coding regions called 'exons'.

Learn more in:

brainly.com/question/24415778

7 0
2 years ago
a star the designation HD 12929 in the constellation Aries is approximately 60 light years from Earth's sun.this star could also
Tems11 [23]

Answer:

The star could also be said to be 360 Million Million miles from the earth's sun.

Explanation:

A light year equals 9.4607 × 10^{12} km.

This is also approximately 6 Million Million Miles.

If we expressed the answer in miles, then we have to multiply 6 by 60.

This is equals to 360.

Therefore, 60 Light years is approximately 360 Million Million miles.

Cheers!

6 0
2 years ago
What process is typical of cancer
zepelin [54]

The cell divides and grows in the organ of origin, causing a localized tumor. Cancer cells then spread to adjacent tissues or regional lymph node drainage areas, and then advance to distant organs or structures, creating metastatic tumors.
4 0
3 years ago
Both lipids and carbohydrates are important in animal cells because both do what
elena55 [62]
Both lipids and carbohydrates are important in animal cells because store energy. The main biological functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Carbohydrates on the other hand have six major functions in the body; including providing energy and regulation of blood glucose, sparing the use of proteins for energy, breakdown of fatty acids and preventing ketosis. 
7 0
3 years ago
Look at the molecule of ATP below. What would need to change about it for the cell to use the energy stored within the molecule?
kolezko [41]

Answer:

A

Explanation:

The only way for a cell to use energy stored within a molecule is in this example would be to break the bond between 1 and two because it would be impossible for energy to get to 3, 4, 5.

6 0
3 years ago
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