Answer:
Explanation:
Ecological pyramids show or explain the number of organisms, the mass of each organism at each levels and the energy transfer at each trophic level. These are referred to as pyramid of number, pyramid of biomass and pyramid of energy.
In Oak tree, at the producer level, which is a tree, will be much smaller to that of primary consumer levels which comprises of millions of insects. This is different to normal trend of ecological pyramids, whereby the number of the producers is always the highest. That's the number of organisms decreases from the producers to the tertiary consumers.
Answer:
b. diffusion and osmosis across semi-permeable membranes
Explanation:
ATP (adenosine triphosphate) is a high energy carrying molecule in the system of living organisms. It posseses the ability to store and release energy for use by organisms during biochemical activities. However, some processes do not require ATP to occur and are called PASSIVE TRANSPORT while those that require energy (ATP) are called ACTIVE TRANSPORT.
In the above options, the processes listed as follows require ATP to occur:
- The active transport of glucose from the small intestine to the blood
- The movement of the flagella of sperm for motility
- Exocytosis of waste substances across a semi-permeable membrane
However, the diffusion and osmosis across semi-permeable membranes, which is a passive transport does not require ATP.
Explanation:
The DNA could be dried -through the process of lyophilization- or stored, as a precipitate of ethanol, in liquid nitrogen (temperatures below -80 degrees Celsius). The aim is to reduce water in the stored samples as much as possible because the water can be involved in natural hydrolytic reactions (depurination, depyrimidination, deamination, and hydrolytic cleavage) that could degrade the nucleic acids of the DNA.
If the DNA is stored while being used regularly it is not advisable to store it as a precipitate of ethanol. It should be stored in aqueous form but in a slightly alkaline pH of about 8.5 to prevent acid-catalysed degradation processes.
Learn More:
For more on DNA storage check out;
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Answer:
mitchondria is powerhouse
