A scientist is trying to elucidate why a certain group of eukaryotic cells died by comparing their proteins to the proteins of similar living cells. Protein sequences show multiple stretches of incorrect amino acid sequences embedded within the polypeptide chain, which are absent in the proteins of the living cells. Which of the following describes a plausible reason for their presence?

A. The DNA primers are absent.
B. The P site in the ribosomes was damaged.
C. The start codons were missing.
D. The genetic code in these cells has been scrambled.
E. The introns of the mRNA were never removed.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

the correct answer is d

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.