Answer:
By the end of prophase, each of the following has occurred except <em>lining up of chromosomes in the cell.</em>
Explanation:
The lining up of the chromosomes in the cell occurs during the third stage of cell division. This stage is termed as the metaphase.
Prophase is the first stage of cell division. Hence, the lining of the chromosomes does not occur by the end of prophase.
During the prophase, the chromatin material condenses and become more compact so that the chromosomes become visible. The nucleolus and the nuclear envelope disappear by the end of prophase. Hence, all other options A, B and C occur by the end of prophase except option D.
Industrial agriculture promote farming techniques that are ecologically destructive by using fertilizers and using processed feeds to feed the animals. Fertilizers contain harmful chemicals that may not be seen on the plants since its main function is to kill the pests that eats the plants. What makes it destructive is when the particles of the fertilizer is mixed with water and then leached into the soil into the water table. The once pure water table is now contaminated. The accumulation of various chemicals from the pesticide can cause the death of aquamarine life and even humans. Also, it can destroy the components of the soil overtime because it can interact with other compounds found in the soil to create a harmful product.
Answer:
Option A, Hormones are controlled by a feedback loop; information about a system is sent back to the controller of the system to improve its function.
Explanation:
Negative feedback loop controls the hormone production and release. This is done by eliciting the release of substances till a certain level after which the stop signal is activated thereby preventing further release. By this method, concentration of hormones in blood is maintained within the narrow range.
For example – Thyroid hormones is released when the anterior pituitary signals the thyroid. This continues till the hormones in the blood reach the threshold level. Once the threshold level is reached, hypothalamus receives a feedback and then signals anterior pituitary to inhibit further signaling to the thyroid
Hence, option A is correct
Grains, seeds, nuts and root
vegetables are examples of complex carbohydrates and they take a longer amount
of time to break down, allowing one to feel full longer. The answer is letter
D. Complex carbohydrates contains a large amount of sugars that are very hard
to break down that is why it takes longer to digest.
Answer:
According to the result recorded, there was no cholesterol in the albumin solution. This is probably because the cholesterol is in the egg yolk and not the egg white. In order to get a positive response on the presence of cholesterol in eggs, an egg yolk albumin stock needs to be prepared. So using the same procedure as before and only replacing the egg yolk for the egg white, prepare a 0.5 mL of egg yolk with 4.5 mL distilled water mixture in a test tube. Follow the steps given in the lab manual to check for presence of lipids in this albumin stock. Take a filter paper and add one drop of Sudan III solution onto it, let it dry and then place a drop of the stock prepared and analyze if the color transfer happens.
Hope that answers the question, have a great day!
