Answer:
5.0 × 10^8 cells.
Explanation:
Mass of DNA = 2 × 10^-12 g/cell
Mass of DNA to be isolated = 0.001 g
No of cells = 0.001/2 × 10^-12
= 5.0 × 10^8 cells.
The plant tissue that is most likely to store water in the cactus plant is vascular tissue.
<h3>What is vascular tissue?</h3>
Vascular tissue is made up of xylem and phloem.
The main function of vascular tissue is to transport water and minerals to parts of plants.
The vascular tissue in the cactus helps to transport water to the spines.
It also stores water for a long period of time.
Thus, the correct option is vascular tissue.
Learn more about vascular, here:
brainly.com/question/12939745
fats are composed of high amounts of saturated fatty acids which are solid at room temperature and oils are composed of mainly unsaturated fatty acids which are a liquid at room temperature
Answer:
Because of the several steps with high temperatures and also (heavy ) changes in temperature.
Explanation:
PCR consists of a serie of 20–40 repeated temperature changes. Those series or cycles are also called thermal cycles.
The individual steps (common to most PCR methods) are as following:
→Denature template : 99 °C for 2 minutes
→Anneal primers to template : 55 °C for 2 minutes
→Extension of the primers by heat stable DNA polymerase :72 °C for 2 minutes
As we can notice, will in a relatively short time, different temperatures be used. It's important that the used polymerase will be functional at corresponding temperatures, as well as (heavy) temperature changes.
→ Since the bacteria Thermus aquaticus lives near thermal vents in the ocean floor and grows at temperatures of up to 98°C, it's used to corresponding temperatures.
If other enzymes will be used, i.e enzymes functional in lower temperatures (several) steps will not continue or will not be executed properly. To avoid this it's important to use the best temperature resistant enzymes.
