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balu736 [363]
2 years ago
11

Scientists are working to find a cure for AIDS. HIV, the virus that causes AIDS, is among the 70 percent of viruses that contain

RNA instead of DNA. The HIV infection mechanism is shown in the diagram. Look at the diagram. Select all the statements that specifically give evidence that HIV is a retrovirus. A. The genetic information is copied from RNA to DNA. B. The genetic information is inserted into the DNA of the host cell, where it may remain inactive for many cell cycles and become activated later. C. The genetic information is transcribed and translated into new viral parts. D. The parts assemble into new viruses and burst from the host cell.
Biology
2 answers:
Tju [1.3M]2 years ago
6 0

Answer:

A. The genetic information is copied from RNA to DNA.

B. The genetic information is inserted into the DNA of the host cell, where it may remain inactive for many cell cycles and become activated later.

Explanation:

What characterizes a retrovirus is the presence of the reverse transcriptase enzyme. This enzyme is capable of transforming the single strand of RNA into a double strand of DNA. This is a unique feature of retroviruses, as transformation usually occurs from DNA to RNA (Transcription).

The retroviral DNA produced associates with the host cell chromosomal DNA.

With the formation of DNA, the RNA strand is degraded. However, the DNA produced by reverse transcriptase will also synthesize the new RNA that will constitute the genome of new viruses formed in the infected cell.

zysi [14]2 years ago
5 0

Answer:

Option A, option B. Option A and B are specific to retroviruses, although option c and d are also true, they are not specific only to retroviruses.

Explanation:

Retrovirus is a type of virus that uses RNA as its genetic material. After infecting a cell, a retrovirus uses an enzyme called reverse transcriptase to convert its RNA into DNA. The retrovirus then integrates its viral DNA into the DNA of the host cell, which allows the retrovirus to replicate.

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Select the correct location on the image. An injury to which marked region would hamper the sleep-wake cycle?
Soloha48 [4]
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4 0
3 years ago
A normal breath takes in about 1.0 L of air. If air has an average molar mass of 28.8 g per 1 mol and has a density of 0.97 g/mL
Ann [662]

Taking into account the definition of density and Avogadro's Number, you take 2.0286×10²⁵ molecules of air.

<h3>What is density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density=\frac{mass}{volume}

<h3>What is Avogadro's Number</h3>

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

<h3>Amount of molecules of air</h3>

In this case, you know that:

  • Density= 0.97 \frac{g}{mL}
  • Volume= 1 L= 1000 mL

Replacing in the definition of density:

0.97 \frac{g}{mL}=\frac{mass}{1000 mL}

Solving:

mass= 0.97 \frac{g}{mL}  ×1000 mL

<u><em>mass= 970 g</em></u>

Air has an average molar mass of 28.8 g per 1 mol. Then 970 grams are contained in 33.68 moles.

Now, considering the definition of Avogadro's number you can apply the following rule of three: If 1 mole of air contains 6.023×10²³ molecules, 33.68 moles contains how many molecules?

amount of molecules = (33.68 moles× 6.023×10²³ molecules)÷ 1 mole

<u><em>amount of molecules= 2.0286×10²⁵ molecules</em></u>

Finally, you take 2.0286×10²⁵ molecules of air.

Learn more about

density:

brainly.com/question/952755

brainly.com/question/1462554

Avogadro's Number:

brainly.com/question/11907018

brainly.com/question/1445383

brainly.com/question/1528951

#SPJ11

4 0
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pentagon [3]

Answer:

Your answer Is C!!!!! :)))

Explanation:

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All wounds are considered contaminated at the time they occur. usually, the natural defenses in our bodies can deal with the inv
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<span>When a body's host defenses are overwhelmed by contaminate, we start seeing biological responses to the invading bacteria. We may notice redness, swelling, oozing, pus, foul odor or warmth at the site of the wound. The host may also have an systemic fever, delirium or other responses when overwhelmed with bacteria.</span>
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