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Akimi4 [234]
3 years ago
7

The Helper T-Lymphocyte expresses ______________ and ______________ on its surface. Select an answer and submit. For keyboard na

vigation, use the up/down arrow keys to select an answer. a CD-4; T-cell receptor b CD-8; T-cell receptor c Class II MHC; CD-4 d Class II MHC; CD-8 e Class II MHC; T cell receptorThe Helper T-Lymphocyte expresses ______________ and ______________ on its surface. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a CD-4; T-cell receptor b CD-8; T-cell receptor c Class II MHC; CD-4 d Class II MHC; CD-8 e Class II MHC; T cell receptor
Biology
1 answer:
ehidna [41]3 years ago
7 0

Answer:

Jbih if

Explanation:

.

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What protist changes shape constantly and flows around its food to engulf it? ________________
andrezito [222]

Answer:

The protist that changes shape constantly and flows around its food to engulf it <u>Amoeba </u>

<u>amoeba</u><u> </u><u>is </u><u>the </u><u>answer </u>

<u>maybe </u><u>I </u><u>think</u><u> </u><u>this </u><u>might </u><u>be </u><u>the </u><u>correct</u><u> </u><u>answer</u>

7 0
3 years ago
a scientist kept 500 grams of a radioactive material in a container. after 60 minutes, he observed that 62.5 grams of the radioa
Gnoma [55]
After the 1st half-life 250 g of the radioactive material will be left. 
<span>After the 2nd half-life 125 g of the radioactive material will be left. </span>
<span>After the 3rd half-life 62.5 g of the radioactive material will be left. </span>

<span>Therefore after 60 minutes, 3 half lives would have occurred. </span>

<span>Therefore the half-life = 60 / 3 = 20 minutes when 250 grams of the original material would have remained radioactive. </span>

<span>Therefore the answer is A) About 250 gram of the material decayed in 20 minutes.</span>
7 0
4 years ago
8. What resistance would produce a current of 350 amps with a potential difference of 2,500 volts? ​
erastova [34]
Potential difference = Current x Resistance.
Therefore if you transpose the formula, Resistance = Voltage divided by Current.
Which would be 2500 volts divided by 350 amps which gives you 7.1 ohms
3 0
3 years ago
What falls in the gray area between living and nonliving things?
WITCHER [35]

The correct answer is C. Virus.

Virus falls on the gray area which is between nonliving and living things.

Virus is referred to as the small infectious agent which replicates only inside the living cells. Virus can infect life forms plants and animals and microorganisms, for example, archaea and bacteria.

They live in form of independent particles which are referred to as virions. Some viruses can evolve from plasmids.

3 0
3 years ago
Read 2 more answers
A hungry rat in an operant chamber is reinforced with food after pressing a bar only if a light on the chamber wall is on. If th
lana [24]

Answer: Discriminative stimulus

Explanation:

A discriminative stimulus is associated with reinforcement or punishment, that exerts control over a particular form of behavior. The subject discriminates between closely related stimuli and elicits a specific behavior only in the presence of that stimulus. T<u>his stimulus increases the probability of a given response</u> because of their historical correlation with the availability of reinforcement for the response.

In this example, the hungry rat gets food if it presses a bar only when the light is on. The rat learns that is most likely to request this food in the future in the presence of this light, because historically, the request has been reinforced in the presence of this light. <u>The light in the example became a discriminative stimulus and it evokes the response.</u>

4 0
4 years ago
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