Answer:
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat.
Explanation:
When the organisms from one trophic level are consumed by organisms from the next level. ... A food chain can usually sustain no more than six energy transfers before all the energy is used up.
No, the mother will probably have problem with the baby later on or when it’s born also she could have a hard delivery to the baby.
Answer:
- Pesticide 1: Induces transition mutations. Rat liver enzymes convert it into a nonmutagenic product. Does not induce frameshift mutations.
- Pesticide 2: Does not induce transition mutations. Rat liver enzymes convert it into frameshift mutagen.
- Pesticide 3: Induces transition mutations. Rat liver enzymes don't have ability to convert compounds into mutagens. Does not induce frameshift mutations.
Explanation:
The Ames test is a technique widely used to evaluate the mutagenic potential of a particular chemical compound. The Ames test uses <em>Salmonella typhimurium</em> strains with a defective mutation that makes them unable to synthesize histidine. When the mutation is reversed, then the revertant strains can grow on a medium lacking histidine. A positive test shows that the chemical is mutagenic because its activity is associated with the reversed mutation and thereby the mutant gene regains its function. In humans, as well as in other mammals, many chemicals don't have mutagenic effects themselves but they may become converted into mutagens when are metabolized by the body. For that reason, rat liver enzymes are added to replicate the metabolic effects of the chemical compound being tested. Nowadays, current tests can express recombinant human proteins instead of rat liver enzymes, thereby enabling a better correlation between mutagenic activity and human metabolic processes.
Answer:
A) ![RF = 0.428](https://tex.z-dn.net/?f=RF%20%3D%200.428)
B) ![RF = 0.857](https://tex.z-dn.net/?f=RF%20%3D%200.857)
Explanation:
RF value in thin-layer chromatography plate is defined as the ratio of distance moved by the steroid spot (A) to the distance migrated by solvent front(B)
Hence, mathematically
------Equation (A)
a) Here
cm and
cm
Substituting the given values in above equation, we get -
![= \frac{6}{14} \\= 0.428\\](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B6%7D%7B14%7D%20%5C%5C%3D%200.428%5C%5C)
b) Here
cm and
cm
Substituting the given values in above equation, we get -
![= \frac{12}{14} \\= 0.857\\](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B12%7D%7B14%7D%20%5C%5C%3D%200.857%5C%5C)
Answer:
Because plants cannot walk around and take their seeds to other places, they have developed other methods to disperse (move) their seeds. The most common methods are wind, water, animals, explosion and fire. Dandelion seeds float away in the wind.
Explanation: