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lions [1.4K]
3 years ago
8

What happens to the influenza virus every 20-40 years, and why? What are the recent example(s)?

Chemistry
1 answer:
LenKa [72]3 years ago
8 0

Answer:

The influenza virus is mutated every 20-40 years.

Explanation:

Large mutations occur every 20-40 years. This results in a new influenza virus to  which the human population has no protection. These large mutations are almost always followed by an influenza pandemic.

Hope this helps!

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Which type of compound usually has higher melting points: ionic compounds or covalent compounds?
faltersainse [42]
Ionic bonds generally have higher melting points due to stronger electrostatic interactions. 
6 0
4 years ago
You have competed an extraction procedure on a mixture of compounds known to contain Lauric acid ( it to get necessary physical
marin [14]

Answer:

3.5 mL

Explanation:

Let us represent lauric acid with the symbol LaCOOH and the anion as LaCOO-. The reaction between the anion and H2SO4 is;

LaCOO-(aq) +  H2SO4(aq) ----->  LaCOOH(aq) + HSO4-(aq)

Number of moles of LaCOO- = 2.75 g/200 g/mol = 0.014 moles

Since the mole ratio of the reaction is 1:1, then the amount of H2SO4 required is also 0.014 moles

Then;

n = CV

n = number of moles

C= concentration

V = volume

V = n/C

V = 0.014 moles/4.0 M

V= 3.5 * 10^-3 L

V = 3.5 mL

5 0
3 years ago
A sample of nitrogen occupies 10.0 liters at 25°c and 98.7 kpa. What would be the volume at 20°c and 102.7 kpa?
Fynjy0 [20]

Answer:

  •    9.4 liter

Explanation:

<u>1) Data:</u>

  •  V₁ = 10.0 L
  •  T₁ = 25°C = 25 + 273.15 K = 298.15 K
  •   P₁ = 98.7 Kpa
  •   T₂ = 20°C = 20 + 273.15 K = 293.15 K
  •    P₂ = 102.7 KPa
  •    V₂ = ?

<u>2) Formula:</u>

Used combined law of gases:

  •    PV / T = constant

  •    P₁V₁ / T₁ = P₂V₂ / T₂

<u>3) Solution</u>:

Solve the equation for V₂:

  •    V₂ = P₁V₁ T₂ / (P₂ T₁)

Substitute and compuite:

  • V₂ = P₁V₁ T₂ / (P₂ T₁)

  • V₂ = 98.7 KPa × 10.0 L × 293.15 K / (102.7 KPa × 298.15 K)

  • V₂ =  9.4 liter ← answer

You can learn more about gas law problems reading this other answer on Brainly: brainly.com/question/12732788.

5 0
3 years ago
If phosphofructokinase experienced a mutation that interfered with substrate binding, then what other enzyme is going to be most
Radda [10]

Answer: A. aldolase

Explanation:

Phosphofructokinase, is an enzyme which is vital in the regulation of fermentation. It is involved in the glycolysis process.

When it experiences a mutation that was being interfered with the substrate binding, we should note that the enzyme that is going to be most immediately impacted in terms of accessing substrate is aldolase.

4 0
3 years ago
Describe cytokinesis in plants and animals.<br> In animals:<br> In plants: -
defon
Cytokinesis is the division of a cell at the end of mitosis, bringing about the separation into 2 daughter cells.
In animals, cytokinesis occurs when a cleavage furrow forms.
In plants, cytokinesis occurs when a cell wall forms in between the daughter cells.
A cleavage furrow is the indentation of the cell's surface.
Hope this helps ;)
8 0
4 years ago
Read 2 more answers
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