Answer:
sarcoplasmic reticulum deteriorates and ATP production is stopped
Explanation:
Rigor mortis is the third stage of death characterized by stiffening of joints and muscles in body. The stiffening occurs because muscles are not able to return to the relaxed state. There are two reasons for rigor mortis, depletion of ATP and increase in calcium concentration in cytosol. Due to these factors the actin-myosin crossbridge is not able to break and the muscles remain in contracted state.
Sarcoplasmic reticulum deteriorates and calcium is released into the cytosol. Sarcolemma ( covering of muscle fiber ) also breaks down releasing extra calcium into the cytosol. Calcium is responsible for formation of actin-myosin cross bridge and when its concentration increases the bridge is formed continuously leading to stiffening of muscles and joints.
Answer: 1. Maury digs a hole in the ground with a shovel and plants a sunflower seed.
2. In time, the sunflower draws water and nutrients from the soil and releases water vapor into the air through its leaves.
3. The air also brings rainwater to the soil.
Geosphere refers to the crust and upper mental part of the earth. It represents the solid part of the earth. The following sentences in the passage directly involve the geosphere.
Maury digs a hole in the ground with a shovel and plants a sunflower seed.: Here, the ground is the part of the geosphere being impacted by the shovel to dig a hole.
In time, the sunflower draws water and nutrients from the soil and releases water vapor into the air through its leaves.: Here, the water present in the geosphere is being taken up by plants. Therefore, this sentence involves geosphere.
The air also brings rainwater to the soil. : Here, the water being evaporated from geosphere comes back in the form rain to the geosphere.
Answer:
Option B, They generally focus on one target insect to ensure that the target insect population remains low.
Explanation:
Biological pest control methodologies are focused towards a specific species of pest and do not harm the non-targeted species. These methods are environment friendly and do not produce any harmful residues. Also they do not develop any kind of resistance in species due to which the same bio pesticide can be used again and again. Since these methods have high specificity, they may require usage of two or more bio pesticides all together.
Hence, option B is correct
Answer:
I would expect that the sample has only 50% of the original 235 U.
Explanation:
That is because 235 U has a half-life of 700 million years and I expect that my sample be 350 million years old. 350 is half of 700.
Percent error is a statistical tool used for evaluating precision. It is expressed as:
Percent error = | (experimental value - theoretical value) / theoretical value | x 100%
Experimental value represents the calculated value while the theoretical value represents the known value. A percent error value which is approaching zero means that your experimental value is close to the known value. Which can possibly mean that you have precise measurements. Calculations are as follows:
Percent Error = | (2.54 - 2.70) / 2.70 | x 100 =5.93%
Thus, the answer is b. 5.93%.
