What type of rock is formed due to the cooling and solidification of magma?

Kay [80]

Answer: salinity is lower in areas that have decreased precipitation

Reason: the density of water increases as the salinity increases.

4 0

2 years ago

Explain why the precise length target DNA sequence doesn't get amplified until the third cycle. You may need to use additional p

shusha [124]

When you start the PCR amplification reaction, you have a template which has sequences where the primers will anneal. The forward primer anneals in the sense strand and the reverse one in the complementary sequence (see attached figure).

After the first PCR cycle, two types of fragments are obtained. First those which come from tha 5'-3' sequence, that are 3'-5' and will anneal the reverse primer in the following cycle. This fragments have the correct 3' end, but the 5' includes part of the template that doesn't correspond to our target (see attached figure)

Second, those fragments that come from the 3'-5' sequence, that are 5'-3' and will anneal the forward primer. This fragments also have the correct 3' end, but the 5' includes part of the template that doesn't correspond to our target (see attached figure).

Now, during the second cycle, are produced the first fragments that have the precise length of the sequence that we want to amplify (see attached figure).

So, it's not until the third cycle that the reaction starts amplifying exactly the sequence of desired length.

3 0

3 years ago

Name the 6 roles of proteins in the body.

Sphinxa [80]

Answer: 1. Repair and Maintenance

Protein is termed the building block of the body. It is called this because protein is vital in the maintenance of body tissue, including development and repair. Hair, skin, eyes, muscles and organs are all made from protein.

2. Energy

Protein is a major source of energy. If you consume more protein than you need for body tissue maintenance and other necessary functions, your body will use it for energy. If it is not needed due to sufficient intake of other energy sources such as carbohydrates, the protein will be used to create fat and becomes part of fat cells.

3. Hormones

Protein is involved in the creation of some hormones. These substances help control body functions that involve the interaction of several organs. Insulin, a small protein, is an example of a hormone that regulates blood sugar. It involves the interaction of organs such as the pancreas and the liver. Secretin, is another example of a protein hormone. This substance assists in the digestive process by stimulating the pancreas and the intestine to create necessary digestive juices.

4. Enzymes

Enzymes are proteins that increase the rate of chemical reactions in the body. In fact, most of the necessary chemical reactions in the body would not efficiently proceed without enzymes. For example, one type of enzyme functions as an aid in digesting large protein, carbohydrate and fat molecules into smaller molecules, while another assists in the creation of DNA.

5. Transportation and Storage of Molecules

Protein is a major element in transportation of certain molecules. For example, hemoglobin is a protein that transports oxygen throughout the body. Protein is also sometimes used to store certain molecules. Ferritin is an example of a protein that combines with iron for storage in the liver.

6. Antibodies

Protein forms antibodies that help prevent infection, illness and disease. These proteins identify and assist in destroying antigens such as bacteria and viruses. They often work in conjunction with the other immune system cells. For example, these antibodies identify and then surround antigens in order to keep them contained until they can be destroyed by white blood cells.

Explanation:

8 0

2 years ago

Energy flows through an ecosystem in one ____, from the sun or organic compounds to ____ and the to various ____ . ((HELP ME PLE

vlabodo [156]

Hi!

Energy will flow through an ecosystem in one direction, from the sun or inorganic compounds to autotrophs and then to various heterotrophs. 

The energy flow in an area will be delivering light energy to autotrophs, which make their food from the energy the sun produces.

The energy flow also delivers energy via inorganic compounds to heterotrophs, which do not make their own food.

Hopefully, this helps! =)

8 0

3 years ago

Most mice living on the mainland of florida are brown, but the mice that live on the sand dunes of the barrier islands have whit

zysi [14]

A trait that improves the fitness of its bearer, compared with individuals without the trait.

7 0

3 years ago