B. Using fewer fossil fuels, such as gasoline for a car, reduces the emission of harmful pollutants into the air
Answer:
A) many noncoding stretches of nucleotides are present in mRNA.
Explanation:
A transcription unit in eukaryotes includes the region that code for mRNA extending from the 5' cap site to the 3' poly-A site. It also includes the controlling regions. The mRNA formed by transcription also has some non-coding intervening sequences. These are called introns. Introns are removed from the primary transcripts by the process of splicing that occurs after transcription.
Therefore, a transcription unit that is 8,000 nucleotides long may use only 1,200 nucleotides to code for a protein having 400 amino acids since the rest of the nucleotides are part of introns and are removed from mRNA after transcription.
Greenhouse gases allow the sun’s rays to pass through
Greenhouse gases absorb infrared radiation from Earth’s surface
( sorry if it’s wrong)
<span>so you something to compare with the growth of fertilized plants</span>
The chemotrophs wojld survive because they obtain energy from inorganic sources rather than organic sources like the sun