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9966 [12]
3 years ago
7

The first cells activated by the antigens are called ?

Biology
1 answer:
juin [17]3 years ago
8 0

Answer:

Effector B- cells.

Explanation:

These are also known as plasma B cells- and are pretty much the cells that secrete antibodies against the antigen in question. They also, through a cascade of events, produce activated T-cells (T-helper and T-cytotoxic cells). The latter cells organize cell-mediated immune response against the antigen.

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Which example of artificial selection is caused indirectly by human activity?
kompoz [17]

The artificial selection is a procedure of selectively breeding certain species of plants and animals in order to develop certain desirable traits. Artificial selection helps the humans to get the plants or livestock that are the most useful for them. Among the given options, the choosing of the sheep giving the most wool, mating of the goats producing more milk, and mating of the ducks to produce large eggs are all examples of the deliberate artificial selection.

But the using of the fishing nets that are catching only the large crabs is an example of indirect artificial selection as it leads to the increased population of small crabs.

Hence, the correct answer is 'option d'.

8 0
3 years ago
Read 2 more answers
Which of the following is TRUE for lipids?
sdas [7]

Answer: D). A and B

Explanation:

Lipids are the biomolecules that are typically non-polar and hydrophobic in nature, which means they are insoluble in water. The function of lipids is to store energy, and they are the integral part of the cell membrane of plant and animal cell. The examples of lipids includes the waxes, steriods, fat soluble vitamins, phospholipids, diglycerides and fatty acids.

5 0
3 years ago
What is the goal of artificial selection?
olya-2409 [2.1K]

Answer:

increase the productive or esthetic value of an organism to our

Explanation: Artificial selection aims to increase the productive or esthetic value of an organism to our advantage. In the field of biology, artificial selection covers a whole host of subtopics. One can implement artificial selection to eradicate disease, increase yield per acre, lower competition within an ecosystem, or produce a new color in a breed of dog.

3 0
2 years ago
Can i get example of ecosystems that I can investigate during winter & how to do so?
Alika [10]

Answer:

there gonna freese and the animals are gonna be hibernating

Explanation:

6 0
3 years ago
A plastic bottle contains 32.5 L of gas at a pressure of 45.7 kPa and
Monica [59]

Answer:

Final pressure, P2 = 362.26 kPa

Explanation:

Given the following data;

Initial volume = 32.5 Liters

Initial pressure = 45.7 kPa

Final volume = 4.1 Liters

To find the final pressure, we would use Boyle's law;

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

PV = K

P_{1}V_{1} = P_{2}V_{2}

Substituting into the equation, we have;

45.7 * 32.5 = P_{2} * 4.1

1485.25 = 4.1P_{2}

P_{2} = \frac {1485.25}{4.1}

P_{2} = 362.26

Final pressure, P2 = 362.26 kPa

5 0
3 years ago
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