The correct answer is: DNA polymerase is a directional enzyme that synthesizes leading and lagging strands during replication
DNA polymerase is an enzyme that synthesizes DNA during the DNA replication by adds nucleotides to the 3’ end of a primer. This means that the new chain is formed in a 5’ → 3’ direction.
Because double-stranded DNA is antiparallel, DNA polymerase moves in opposite directions on the two strands-leading and lagging strand.
The leading strand is copied continuously since DNA polymerase is moving towards the replication fork. The lagging strand is copied discontinuous. DNA polymerase is moving away from the replication fork (and helicase that separates the strands), so it must constantly return to copy newly separated stretches of DNA. So, the lagging strand is copied as a series of short fragments-Okazaki fragments that are joined together by a combination of DNA pol I and DNA ligase.
The answer is A. random gene pool changes in small population.
When the rates of two processes photosynthesis and respiration becomes equal. Phototrophic organisms wouldn't be able to compensate for the lack of carbon dioxide levels. Phototrophs wouldn't be able to produce their food in the form of glucose and hence wouldn't be able to respire too. That would result in lack of overall available food from phototrophs and lack of available oxygen for respiration.
Photosynthesis also uses carbon dioxide faster than respiration produces it. Oxygen surplus is is released into the air and unused glucose is stored in the plant for later. That's why plants are so important to human and animal survival. Without photosynthesis we wouldn't have oxygen for food to stay alive and we would end up like the movie The Lorax
