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Where is DNA found? | What does DNA do? | What is DNA made of?

Where is DNA found?
In organisms called eukaryotes, DNA is found inside a special area of the cell called the nucleus. Because the cell is very small, and because organisms have many DNA molecules per cell, each DNA molecule must be tightly packaged. This packaged form of the DNA is called a chromosome.

During DNA replication, DNA unwinds so it can be copied. At other times in the cell cycle, DNA also unwinds so that its instructions can be used to make proteins and for other biological processes. But during cell division, DNA is in its compact chromosome form to enable transfer to new cells.

Researchers refer to DNA found in the cell's nucleus as nuclear DNA. An organism's complete set of nuclear DNA is called its genome.

Besides the DNA located in the nucleus, humans and other complex organisms also have a small amount of DNA in cell structures known as mitochondria. Mitochondria generate the energy the cell needs to function properly.

In s…

Allergies | Symptoms of allergies | Living with allergies

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Allergies An allergy is an immune system response to a foreign substance that’s not typically harmful to your body. These foreign substances are called allergens. They can include certain foods, pollen, or pet dander. Your immune system’s job is to keep you healthy by fighting harmful pathogens. It does this by attacking anything it thinks could put your body in danger. Depending on the allergen, this response may involve inflammation, sneezing, or a host of other symptoms. Your immune system normally adjusts to your environment. For example, when your body encounters something like pet dander, it should realize it’s harmless. In people with dander allergies, the immune system perceives it as an outside invader threatening the body and attacks it. Allergies are common. Several treatments can help you avoid your symptoms. Symptoms of allergies The symptoms you experience because of allergies are the …

What is ADHD? | ADHD symptoms

Attention deficit hyperactivity disorder (ADHD) is a mental health disorder that can cause above-normal levels of hyperactive and impulsive behaviors. People with ADHD may also have trouble focusing their attention on a single task or sitting still for long periods of time. Both adults and children can have ADHD. It’s a diagnosis the American Psychiatric Association (APA) recognizes.  ADHD symptoms A wide range of behaviors are associated with ADHD. Some of the more common ones include: having trouble focusing or concentrating on tasks being forgetful about completing tasks being easily distracted having difficulty sitting still interrupting people while they’re talking If you or your child has ADHD, you may have some or all of these symptoms. The symptoms you have depend on the type of ADHD you have. Explore a list of ADHD symptoms common in children. Types of ADHD To make ADH…