#Question id: 12162
#Unit 8. Inheritance Biology
Nilsson-Ehle’s cross obtained homozygous varieties of wheat that differed in color, he crossed a variety of wheat that possessed white kernels with a variety that possessed red kernels and obtained the following results:
The following conclusions are made from the results obtained;
#Question id: 12083
#Unit 10. Ecological Principles
In bottom sediments of lakes and streams, organic matter is broken down by heterotrophic microorganisms and ammonia is released. Under aerobic conditions, specialized bacteria convert ammonia to nitrate (nitrification). This nitrate, together with nitrate from other sources, diffuses into the deeper sediments, where it may undergo anaerobic conversion to nitrogen gas (denitrification). These sediments typically contain oligochaete worms that live with their heads buried and their tails waving back and forth in the overlying water. Plastic columns were packed with freshly collected stream sediments and then covered with layers of nitrate enriched water. A similar set of columns was packed with sediment that had been sterilized and then covered with either nitrate-enriched water or distilled water. Oligochaete worms were collected and acclimated to 20°(C)Following acclimation, worms were rinsed in distilled water and then added to three sediment columns. The columns were incubated in the dark at 20°C and monitored every three days for changes in the concentration of nitrate in the overlying water. Nitrate concentrations in each of the experimental treatments were plotted against time, as shown in the graph below
It can be concluded from the figure that
#Question id: 322
#Unit 1. Molecules and their Interaction Relevant to Biology
A covalent bond is likely to be polar when ________.
#Question id: 8848
#Unit 9. Diversity of Life Forms
A carbon skeleton is covalently bonded to both an amino group and a carboxyl group. When placed in water it
#Question id: 3041
#Unit 2. Cellular Organization
Which statement about gram-negative bacteria is correct?