BIOLOGY HIGH SCHOOL

After an RNA molecule is transcribed from a eukaryotic gene, portions called _____ are removed and the remaining _____ are spliced together to produce an mRNA molecule with a continuous coding sequence.a. operators ... promotersb. exons ... intronsc. introns ... exonsd. silencers ... enhancerse. promoters ... operators

Answers

Answer 1
Answer:

Answer:  Portions called introns are removed and the remaining exons are spliced together

Explanation:

The messenger RNA obtained after transcription is known as primary transcribed RNA or precursor RNA, and it has to undergo modifications before exerting its function. This is called RNA processing or maturation.

In the DNA sequence, the coding content of a gene is not continuously distributed along the gene, but has discontinuities, called introns, whose sequence does not encode proteins. The parts of the sequence that encode proteins are called exons. Through a process called splicing (which is one of the modification that are part of the RNA maduration), the introns are eliminated and the exons are joined forming a mature messenger RNA molecule that will be used for protein synthesis.

So the exons are part of the region of a gene that is not separated during the cutting and splicing process and is therefore kept in the mature messenger RNA. Each exon codes a specific portion of the entire protein, so that the set of exons forms the coding region of the gene.


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Many cacti, such as saguaros and barrel cacti, have large stems and no leaves. What function of leaves is taken on by the stems of such cacti? A. They produce food by photosynthesis.

B. They absorb water and nutrients from the soil.

C. They transport materials throughout the plant.

D. They store excess water.

Answers

The correct answer is A. They produce food by photosynthesis.

Since leaves are the ones that photosynthesize food, here the stems have to do it because there are no leaves.

Answer:

a

Explanation:

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Answers

Answer: cyclic

Explanation:

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Answers

the answer to the question is absolute threshold. In neuroscience and psychophysics an absolute threshold was defined as the lowest level of a stimulus i.e light, sound, touch e.t.c that an organism could detect. It can be influenced by several different factors such as the subjects motivations and expectations, cognitive processes and whether the subject is adapted to the stimulus.
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