Answer:
A) One band of intermediate density and one band of heavy density.
Explanation:
According to semi conservative model of replication the two DNA strands separate during replication such that the new DNA molecule has one parental strand and one new strand. In this experiment, originally E.Coli cells were grown in 14N medium so all the DNA strands had 14N. When the medium was changed to 15N, only 15N would be available to the cells for replication.
After first round of replication all DNA molecules would be of intermediate density as one strand would be old 14N strand and another would be new 15N strand. After second round of replication 15N strand would be formed from both 14N strand and 15N strand. So, one band will be formed of intermediate density (14N-15N) and another would be of heavier density (15N-15N).
Answer:
false?
Explanation:
Steps of cellular respiration
- Glycolysis. Six-carbon glucose is converted into two pyruvates (three carbons each). ..
- Pyruvate oxidation. Pyruvate travels into the mitochondrial matrix and is converted to a two-carbon molecule bound to coenzyme A, called acetyl CoA. ...
- Citric acid cycle. ...
- Oxidative phosphorylation.
Answer:
In some aquatic ecosystems, the biomass pyramid can be inverted because the biomass of organic matter at lower tropic level is lesser than the organic matter biomass at higher tropic level.
This is because phytoplankton are smaller than their consumers who are zooplanktons. Zooplankton is smaller than secondary consumer krills and small fishes and these small fisher are smaller than tertiary consumers like shark, killer whales.
Short life span of lower trophic level organisms is also a reason for lower biomass at lower trophic levels. This makes the pyramid of biomass inverted in some aquatic ecosystems.
Answer and explanation:
That's because the upper part of your nose isn't open to receive the chemicals that trigger the olfactory receptors (those inform your brain and create the sensation of flavor).