Okay, everyone. A naive lymphocyte has what characteristics? So we're gonna be talking about a lot of different lymphocytes in this lesson, specifically the different types of t cells and the different types of b cells. And lymphocyte includes all of those different cell types. And we'll commonly use the descriptor of naive when these lymphocytes are generally just forming and have certain characteristics. So let's look. Answer choice a says, a naive lymphocyte has encountered an antigen with its receptor but has not yet produced antibodies. The important thing to understand is that only certain lymphocytes create antibodies, not all of them. For example, b cells make antibodies but t cells do not. So this is not an overarching characteristic of all naive lymphocytes. And I will tell you that even naive b lymphocytes do not make antibodies. So this is not true. Answer choice b says, a naive lymphocyte has not yet encountered an antigen recognized by its receptors but is producing antibodies. Remember, not all lymphocytes make antibodies, so this is not true. Also, we do not want our cells to produce antibodies if they haven't encountered anything that is dangerous because then they're just producing antibodies for no reason. So this doesn't make any sense either. Answer choice c says, the naive lymphocyte has encountered an antigen and has undergone apoque apoptosis. No. Naive lymphocytes are not going to be labeled for death. Remember, that's what apoptosis is. And naive lymphocytes have actually not encountered an antigen yet, so that's not true either. Answer choice d says, a naive lymphocyte has fully developed antigen receptors, but has not yet encountered an antigen. Absolutely. This is true. So this is a fully formed t cell or b cell, but it's naive because it hasn't encountered an antigen yet. And when it does encounter an antigen, it will become a mature lymphocyte and that will activate that lymphocyte and it will either turn into an effector cell, which will perform some immune function, or a memory cell, which will keep the memory of that pathogen for later in life if that person or animal is ever infected by that pathogen again. So, yes, a naive lymphocyte is fully developed with all of its resources, all of its antigens, but it has not yet encountered an antigen. Okay. So d is probably good, but let's look at e. Answer choice e says a naive lymphocyte has produced antibodies despite not having developed receptors. No. Remember not all lymphocytes produce antibodies and the lymphocytes that do produce antibodies are not going to produce them in their naive state because they have not yet encountered an antigen. So the correct answer to this question is answer choice d. Okay, everyone. Let's move on to our next video.

Table of contents

1. Introduction to Microbiology3h 22m
2. Disproving Spontaneous Generation1h 18m
3. Chemical Principles of Microbiology3h 38m
4. Water1h 28m
5. Molecules of Microbiology2h 23m
6. Cell Membrane & Transport3h 28m
7. Prokaryotic Cell Structures & Functions5h 52m
8. Eukaryotic Cell Structures & Functions2h 18m
9. Microscopes2h 46m
10. Dynamics of Microbial Growth4h 36m
11. Controlling Microbial Growth4h 10m
12. Microbial Metabolism5h 16m
13. Photosynthesis2h 31m
14. DNA Replication2h 25m
15. Central Dogma & Gene Regulation7h 14m
16. Microbial Genetics4h 44m
17. Biotechnology3h 0m
18. Viruses, Viroids, & Prions4h 56m
19. Innate Immunity7h 15m
20. Adaptive Immunity7h 14m
21. Principles of Disease6h 57m

20. Adaptive Immunity

Introduction to T Lymphocytes

Microbiology

20. Adaptive Immunity

Introduction to T Lymphocytes

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Multiple Choice

A naive lymphocyte:

Has encountered an antigen with its receptor but has not yet produced antibodies.

Has not yet encountered an antigen recognized by its receptors but is producing antibodies.

Has encountered an antigen and has undergone apoptosis.

Has fully developed antigen receptors but has not yet encountered an antigen.

Has produced antibodies despite not having developed receptors.

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Verified step by step guidance

Understand the definition of a naive lymphocyte: A naive lymphocyte is a type of immune cell that has fully developed antigen receptors but has not yet encountered an antigen.

Recognize that naive lymphocytes are part of the adaptive immune system and are crucial for responding to new infections.

Identify that naive lymphocytes have not yet been activated by an antigen, meaning they have not yet encountered an antigen that binds to their specific receptors.

Clarify that naive lymphocytes do not produce antibodies until they are activated by an antigen. Antibody production is a function of activated B cells, not naive lymphocytes.

Conclude that the correct description of a naive lymphocyte is that it has fully developed antigen receptors but has not yet encountered an antigen.