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Galina-37 [17]
3 years ago
7

Which of the following is a characteristic of RNA splicing in Eukaryotes?

Biology
1 answer:
Zanzabum3 years ago
8 0

Answer:

The correct answer is a. Exon/intron boundaries are typically characterized by a 5' GU splice junction and a 3' AG splice junction.

Explanation:

Splicing is the process in which the non-coding introns are removed from the mRNA and only coding sequences remains in mRNA.  

The splicing of introns depends on the recognition of splice site pair. Usually, 5'-GU-3' is 5' splice site and 5'-AG-3' is 3' splice site which makes the boundary of introns/exons and these two nucleotides are important to recognize the introns.

There are some additional conserved sequence at these two splice site which help in recognition of introns. First, a lariate structure is formed when 5'-GU-3' is cleaved and joined to the branch point that is present near 3' slice site. Then 3' splice site is cleaved which releases the intron. Therefore the correct answer is a.

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There are ___________ pair of true ribs.
Bad White [126]

Answer:

7

Explanation:

There are 12 total pairs of ribs. 1-7 are attached directly to the sternum by costal cartilages, making them true pairs. 8-10 are fake pairs, which means they're attached indirectly to the sternum. And 11 and 12 and free floating ribs, meaning they aren't attached.

5 0
3 years ago
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The shape of the cell changes in_______
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Answer:

Its Euglena

Explanation:

Shape change from normal elongated egg-shape to round-shape in stressful environment. These shape changes attain two transition phases. The I-transition phase is reversible where the organism can return to normal if favourable environment persists.

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3 years ago
What are the four nitrogen bases in DNA (check all that apply)?
Dominik [7]

thymine

adenine

cytosine

guanine

Explanation:

uracil is not because uracil is only RNA.

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3 years ago
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When a mustard plant seedling is transferred to an environment with higher levels of carbon dioxide, the new leaves have a lower
DIA [1.3K]

Answer:

When a mustard plant seedling is transferred to an environment with higher levels of carbon dioxide, the new leaves have a lower stomata-to-surface-area ratio, it is because the concentration of carbondioxide is high in the surrounding so the plant produce small leaves having less number of stomata. If the concentration of carbondioxide is lower so big leaves are produced having maximum number of stomata.

3 0
3 years ago
Like all forms of life on Earth, all microbial cells perform three major types of activities: __________.
pashok25 [27]

Answer:

4. metabolism, growth, and evolution

Explanation:

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They perform three major types of activities like metabolism, growth, and evolution. This can be seen by culturing bacteria on suitable media. So in the medium, it can be observed that they consume the food present in media and extract energy from it through metabolic activities and are showing growth. All micro-organisms evolve due to mutation. So the correct answer is 4.

3 0
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