In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.
Answer;
Population; physiological modifications at the individual level.
The adaptation of the sled dog best describes adaptation at the population level while the dog exposed to seasonal colder temperatures has physiological modifications at the individual level.
Explanation;
-The bodies of sled dogs are covered with two coats of hair that work together to provide a double layer of warmth. The under layer is very short and the dog sheds it in the spring to keep from overheating during warmer temperatures.
-During the colder winter months, this under layer works as an insulator against the dog's skin to keep his body warm and his core body temperature consistent. This adaptation best describes adaptation at the population level while the dog exposed to seasonal colder temperatures has physiological modifications at the individual level.
Answer:
It is similar because the nuclear envelope is a membrane similar to the cell membrane around the whole cell. There are pores and spaces for RNA and proteins to pass through while the nuclear envelope keeps all of the chromatin and nucleolus inside. When the cell is in a resting state there is something called chromatin in the nucleus.
Explanation:
Answer:
Benedict's solution can be used to test for the presence of glucose in urine. ... When reducing sugars are mixed with Benedicts reagent and heated, a reduction reaction causes the Benedicts reagent to change color. The color varies from green to dark red (brick) or rusty-brown, depending on the amount of and type of sugar.
Explanation:
Answer:
1. A producer is an organism that is capable of making its own food. For example, plants.
2. A consumer is an organism that cannot make its own food and hence fed on producers or other consumers. E.g humans
3. A predator-prey relationship is a relationship in which a predator organism eats a prey organism. For example, lion and zebra.
4. Symbiosis is a biological interaction between organisms of different species.
5. Parasitism is a biological interaction in which one organism gains benefit and harms the other organism.
6. Commensalism is a biological interaction in which one organism gains benefit whereas the other organism neither gets harmed nor gains any benefit.
7. Mutualism is a biological interaction in which both the organisms benefit from each other.
8. A niche is the role which an organism plays in a community or an ecosystem.
9. The three types of symbiosis are Parasitism, Commesalism and Mutualism.
