Answer:
The answer would be A, only chloroplasts and vacuoles are found in plant cells. :)
A. To understand the nature of an experimental subject
The correct answer is C. A windstorm blew down trees in the Boundary Waters Canoe Area in Minnesota on July 4, 1999.
Explanation:
A weather event refers to a specific phenomenon in weather that in most cases is not common but particular and specific, which is different to weather patterns, this includes specific hurricanes, abnormal rain patterns, etc. Considering this, the one that is an example of a weather event is "A windstorm blew down trees in the Boundary Waters Canoe Area in Minnesota on July 4, 1999" because this is a specific phenomenon rather than a pattern in weather as int the case of hurricane seasons or permanent weather conditions.
Answer:
45 g of the solid Tris will be dissolved in 2.5 liters of water.
Explanation:
Recall that:
<em>Number of moles = molarity x volume</em>
Hence, number of moles of Tris present in 2.5 liters, 150 mM solution:
= 150/1000 x 2.5 = 0.375 moles
Also, recall that:
<em>No of moles of substance = mass/molar mass.</em>
Hence, mass of 0.375 moles substance:
= no of moles of the substance x molar mass of the substance.
= 0.375 x 120 = 45 g.
Therefore, in order to prepare 2.5 liters, 150 mM of an aqueous solution of Tris, 45 g of the solid Tris will be dissolved in 2.5 liters of water.
