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Naily [24]
3 years ago
8

What is the type of virus that codes backwards from RNA to DNA?

Biology
1 answer:
Lunna [17]3 years ago
3 0


The answer is D.

 A retrovirus is any of a group of viruses that  characteristically carry their genetic information in form of RNA.  These viruses have an enzyme called reverse transcriptase from which they derive their name because they follow the first step  of the central dogma backward  thus "retro" which means backward.

Reverse transcriptase makes DNA from RNA template  thus reversing the usual pattern of transcribing RNA using DNA as the template.

The central dogma of  molecular genetics  summarizes steps of protein synthesis as DNA → RNA → protein.  But retroviruses have modified the process to be  RNA → DNA → RNA  → protein.


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Before returning to the heart, blood from the digestive tract first passes through the..
loris [4]

Answer: Liver

Explanation:

The hepatic portal system of liver connects the capillaries of the gastrointestinal tract to the liver. The nutrient rich blood from the gastrointestinal tract reaches the liver.

The blood that is returned back to the heart is first bought to liver and then it is returned back to the heart.

From the liver after processing the blood goes into heart for further processing.

Hence, the correct answer is option d

7 0
3 years ago
How does a chemical equation with coefficients relate to the law of conservation of mass?
Zepler [3.9K]

Answer:

Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. ... Use coefficients of products and reactants to balance the number of atoms of an element on both sides of a chemical equation.

Explanation:

8 0
3 years ago
What situation is an example of artifical selection
ss7ja [257]

<u>Answer:</u>

An example situation of artificial selection is "More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory".

<u>Explanation:</u>

  • The process of breeding animals to acquire the desired characteristics by the external means other than natural selection and behavior of animal itself is called as artificial selection.
  • The first artificial selection was carried out by Darwin when he mated penguins that would have a higher chance of breeding.
  • The practice of artificial selection was existing in human civilization a long time ago.
  • This process was used to use wild animals and domestic animals in battles and other household works.
3 0
3 years ago
Function of the plant cell wall?
bekas [8.4K]
<span>The function of a cell wall has the same function of the cell membrane; it protects the cell. Cell wall is made up of cellulose that is only present in plant cells. Cellulose is a sugar that has a sheet like structural carbohydrate. It is rigid that is used for support and provides protection to the plant cell from damage. They cannot be dissolved in water. An example is if you eat food that contains mostly of leaves. You will observe that you will eliminate the same material as when you it. That is because our human body does not have the enzyme that dissolves the cellulose.</span>
7 0
3 years ago
What's the answer to this question
Flauer [41]
The answer is C. Thermal energy is transferred to her face by radiation, and thermal energy is transferred to the bottoms of her feet by conduction. 

Conduction is a method of transferring heat by using the collision of molecules and free electrons (depending on the material). Heat is usually transferred by conduction if both objects are in contact with each other that way the molecules can collide and spread the kinetic energy thus raising their internal heat. So, since the feet and the sand are in contact, so the heat should be transferred by conduction. However, air is a very poor heat conductor, it cannot transfer heat efficiently, therefore, the first answer is not conduction. 

Radiation is a method of transferring heat too but using electromagnetic waves. It works great even in the air, or even with vacuum space. The sun shining from outer space to earth through the vacuum space is also by radiation. So, the first answer is radiation. 

The answer is C, hope it helps!
7 0
3 years ago
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