Answer: e. YqhD gene
Explanation:
The researchers showed that most of the isobutanol produced in E.coli strains is due to the action of the alcohol dehydrogenase YqhD. Remember that E. coli has several genes encoding for alcohol dehydrogenases.
They deleted the yqhD gene and found a 80% reduction in isobutanol production.
Answer:
C: The shape of the pebbles is a result of weathering and deposition
Explanation:
For the several pebbles to have a rounded shape and smooth to the touch, it will undergo weathering and deposition. This is because weathering involves breaking down of rocks and creating new sediments. This weathering could be either chemical weathering or physical weathering where Chemical weathering is the decomposition of rocks which are caused by chemical reactions and which result in formation of new compound while physical weathering is the breakdown of rocks into smaller pieces. On the other hand, deposition occurs when the agents of erosion such as wind or water deposit sediments from one spot to another which in turn changes the shape of the land.
Thus, the shape of the pebbles are as a result weathering of the parent rocks and from deposition.
Tectonic plates, specifically divergent plates, are constantly creating new crust on the surface, pushing the older crust away. Additionally, the mantle has convection cycles that makes hot magma rise, further leading to the crust constantly moving because of that warm lava force.