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kumpel [21]
3 years ago
8

People with Aids lack helper t cells so they are unable to activate the t cell and b cell response​

Biology
1 answer:
Sedbober [7]3 years ago
7 0

Answer:

Because T-cell-independent antigens do not activate helper T cells, they fail to induce B cell memory, affinity maturation, or class switching, all of which require help from T cells. They therefore mainly stimulate the production of low-affinity (but high-avidity) IgM antibodies.

Explanation:

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An air pressure of 1,005 millibars is equivalent to approximately how many inches of Mercury?
N76 [4]

1005milibars of pressure corresponds to 29.68inches of mercury.

Option D.

<h3><u>Explanation:</u></h3>

Mercury has a density of around 13.6gm/cc. Thus the pressure of inches of mercury will have a huge effect on the value. As far as bar is concerned, it's around the normal atmospheric pressure measured at sea level. Its around 1,00,000 pascals. So from converting a pressure at millibars to inches of mercury, we need to divide the value by a factor of 33.864.

So, pressure in milibars =1005milibars.

So, pressure in inches of mercury = 1005/33.864 = 29.68 inches of mercury.

6 0
3 years ago
Because it is difficult to excrete iron once it is in the body, iron balance is maintained primarily through absorption. The iro
Rzqust [24]
<h2>The given statement is true</h2>

Explanation:

Iron absorption occurs in the duodenum and upper jejunum of small intestine

  • At physiological pH ferrous iron is rapidly oxidized to the insoluble ferric form
  • Gastric acid lowers the pH in the duodenum which enhances the solubility and uptake of ferric iron
  • Once iron gets inside the enterocyte it can be stored as ferritin;Ferritin is a hollow spherical protein which helps in storage and regulation of iron levels within the body
  • Ferritin molecule have ferroxidase activity which helps in the mobility of Fe2+ out of the enterocyte by ferroportin
  • Transferrin is the major iron transport protein which transports iron through blood
  • Fe3+ binds to transferrin so Fe2+ transported through ferroportin must be oxidized to Fe3+
  • Fe2+ needs to be oxidized first so that it can be transported through ferroportin
  • Once iron gets inside the cell it can be used for various cellular processes
6 0
3 years ago
4. Monosaccharides are to polysaccharides as
vova2212 [387]

Answer:

C

Explanation:

C

8 0
2 years ago
Drug ______ is when the body has become accustomed to a medication after being on it for a length of time, and higher doses are
skelet666 [1.2K]
Drug "Tolerance" is the status of when the body has become accustomed to a medication and requires more to achieve a same affect. Makes sense wouldn't you say. 
8 0
2 years ago
Give me one example of how people use graphs in the real world,
Mama L [17]

Answer:

By wealth, or how much profit people make in a business

Explanation:

Sometimes this is in movies, but in the real world this is essential so they can keep track of profits and customer services

3 0
3 years ago
Read 2 more answers
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