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krek1111 [17]
3 years ago
7

Select the correct answer.

Biology
1 answer:
Blizzard [7]3 years ago
4 0

Answer:

<em>A. </em>

<h3><em>A. True</em></h3>

Explanation:

Immunoglobulins, also known as antibodies, are glycoprotein molecules produced by plasma cells (white blood cells). They act as a critical part of the immune response by specifically recognizing and binding to particular antigens, such as bacteria or viruses, and aiding in their destruction.

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A certain element has a half-life of 1,000 years. How much of a sample of this element remains after 2,000 years?
quester [9]

Answer:

A quarter of the sample.

Explanation:

Let the quantity at the beginning be T. If the element has a half-life of 1,000 years, it means that after 1000 years, T/2 (which represents half the initial quantity available) would have decayed, remaining T/2.

After another 1000 years (making 2000 years), T/4 (which represents have of the quantity left after the first 1000 years) would have decayed, remaining T/4.

This means that only a quarter of T would be left after 2000 years.

5 0
3 years ago
Which of the following examples shows the influence coal has had on human activity?
Ghella [55]

Answer:

The correct option is A. Coal use in steam engines led to easier access to goods.

Explanation:

Coal is used in steam engines as a fuel. Coal is one of the cheapest source of energy and hence it has been serving mankind with various benefits since a long period of time.

The coal-based steam engines played a very important role in the developments made during the Industrial Revolution. Many industries started using coal as a power material and made progress.

The steam engines made it possible to transfer goods from one place to another very easily. As coal was a cheap source, hence trading of goods by steam engines was not very costly.

8 0
3 years ago
1. How do living things get energy from the sun?
denis23 [38]

Living things get energy/food from the sun through a process called Photosynthesis

it's the process by which living organisms manufacture food in the present of sunlight, oxygen and some other vital nutrients.that is Carbon dioxide etc

3 0
2 years ago
suppopse you were going to deisgn a system for the rapid diffusion of oxygen across a phosphlipid bilayer. according to fick's l
Llana [10]

Answer:

According to Fick's law, the rate of diffusion of any substance across any barrier is<u> directly proportional to the surface area of the membrane or any layer exposed. and the concentration of the diffusing substance available, but the rate is inversely proportional to the diffusion distance available.</u>

<u />

Thus the rate at which oxygen will move across the phospholipid  bilayer will depend on the concentration or amount  per mole  of the oxygen molecule hitting the phopholipid at  a prticular time and how permeable the phospholipd layer is to oxygen molecules, but the rate of its  movement across will be reduced as the distance between the phosphoslipid bilayer and the diffusing molecules  increases.

Therefore, the concentration of oxygen should be maximised, the surface area of the phospholipid  bilayer should also be maximized. the distances between the phopholipid and the  vessel containing the diffusing oxygen molecules should be drastically reduced. With this Fick's law  has been applied , and therefore maximum oxygen molecules can diffuse across.

Explanation:

5 0
3 years ago
How might it be possible for a child to show a trait that neither of the parents showed?​
e-lub [12.9K]

A person can only show a recessive trait if both of their parents carried at least one copy of each of the recessive allele. The parents do not need to show the trait, as one copy is not enough to reveal it, but they must both carry it.

Hope this helped!

5 0
2 years ago
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